Unreferenced date April 2007 A code WHERE code clause in SQL specifies that a SQL Data Manipulation Language ... or returned by a query. Overview code WHERE code is an SQL 2003 SQL reserved word. The code WHERE code clause is used in conjunction with SQL DML statements, and takes the following general form source lang sqlSQL DML Statement FROM table name WHERE predicate source all rows for which the predicate in the code WHERE code clause is True are affected or returned by the SQL DML statement or query ... in column mycol is greater than 100. source lang sql SELECT FROM mytable WHERE mycol 100 source The following Delete SQL code DELETE code statement removes only those rows from table mytable where ... mytable WHERE mycol IS NULL OR mycol 100 source The proper syntax for writing SQLWhere clause ref cite web title SQLWhere video tutorial url http www.sqlserver training.com sqlwhere video tutorial ..., and the value of item is equal to the string literal Hammer source lang sql DELETE FROM mytable WHERE .... source lang sql SELECT ename WHERE ename IN value1 , value2 , ... source All rows match the predicate ... lang sql SELECT ename WHERE ename value1 OR ename value2 source except that the latter could allow comparison ... lang sql SELECT ename WHERE ename BETWEEN value1 AND value2 source All rows match the predicate ... sql SELECT ename FROM emp WHERE ename LIKE S source Leading Wildcard Find any string that ends with the letter S source lang sql SELECT ename FROM emp WHERE ename LIKE S source Multiple Wildcards Find any string that contains, anywhere, the letter S source lang sql SELECT ename FROM emp WHERE ename ... single character followed by the letter E source lang sql SELECT ename FROM emp WHERE ename LIKE A E ... clauses. References references SQL DEFAULTSORT WhereSql Category SQL keywords cs WHERE no WhereSQL ru WhereSQL sq WhereSQL uk WhereSQL .... The criteria are expressed in the form of predicates. code WHERE code clauses are not mandatory clauses ... more details
WhereSQLWHERE code clause includes a comparison predicate, which restricts the rows returned by the query ... table rows, e.g., syntaxhighlight lang sql UPDATE My table SET field1 updated value WHERE field2 ... lang sql DELETE FROM My table WHERE field2 N syntaxhighlight code Merge SQL MERGE code is used ..., leading to ambiguity. Many database vendors have large existing customer bases where the SQL standard ...About the database language the IATA code San Carlos Airport Infobox programming language name SQL paradigm ... SQL 2011 latest release date 2011 turing complete No typing Static typing Static , strong typing strong implementations List of relational database management systems Many dialects SQL 86, SQL 89, SQL 92 , SQL 1999 , SQL 2003 , SQL 2008 , SQL 2011 influenced by Datalog influenced Agena programming ... 45498 title ISO IEC 9075 1 2008 Information technology Database languages SQL Part 1 Framework SQL ... to end in a . , as necessary. inconsistent citations file ext .sql Infobox file format name SQL screenshot caption Structured Query Language extension .sql mime application x sql uniform type owner ... SQL 2008 latest release date Start date and age 2008 df yes genre Database standard ISO IEC 9075 ... 45498 title ISO IEC 9075 1 2008 Information technology Database languages SQL Part 1 Framework SQL ... to end in a . , as necessary. inconsistent citations ref SQL IPAc en icon s k ju l S Q L ref cite book last Beaulieu first Alan title Learning SQL editor Mary E Treseler publisher O Reilly location ... and delete , database schema schema creation and modification, and data access control. SQL was one ... by Codd , it became the most widely used database language. ref name SQL Fundamentals ref name IBM sql cite web title Structured Query Language SQL publisher International Business Machines ... c0004100.htm date October 27, 2006 accessdate 2007 06 10 ref Although SQL is often described as, and to a great ... programming procedural elements. SQL became a Technical standard standard of the American National ... more details
A code HAVING code clause in SQL specifies that an SQL code Select SQL SELECT code statement should only return rows where aggregate values meet the specified Condition SQL condition s. It was added When date February 2011 to the SQL language because the code WhereSQLWHERE code keyword could not be used with aggregate functions. ref cite web url http www.w3schools.com SQLsql having.asp title SQL HAVING Clause publisher w3schools.com quote The HAVING clause was added to SQL because the WHERE keyword could not be used with aggregate functions. ref Examples To return a list of department IDs whose total sales exceeded 1000 on the date of January 1, 2000, along with the sum of their sales on that date source lang sql SELECT DeptID, SUM SaleAmount FROM Sales WHERE SaleDate 01 Jan 2000 GROUP BY DeptID HAVING SUM SaleAmount 1000 source Referring to the sample tables in the Join SQL example, the following query will return the list of departments who have more than 1 employee source lang sql SELECT DepartmentName, COUNT FROM employee,department WHERE employee.DepartmentID department.DepartmentID GROUP BY DepartmentName HAVING COUNT 1 source References Reflist External links http www.databasejournal.com features mysql article.php 3469351 The HAVING and GROUP BY SQL clauses http www.w3schools.com sqlsql functions.asp SQL Aggregate Functions SQL DEFAULTSORT Having Sql Category SQL keywords Category Articles with example SQL code database stub compu lang stub ru Having SQL sq Having SQL uk Having SQL ... more details
Multiple issues unreferenced December 2009 cleanup March 2008 context October 2009 Meta SQL Use with reference to PeopleSoft Meta SQL expands to platform specific SQL substrings, causes another function to be called, or substitutes a value. Meta SQL constructs are used in functions that pass SQL strings, such as the following SQLExec. Scroll buffer functions ScrollSelect and its relatives . PeopleSoft Application Designer dynamic and SQL views. Some Rowset class methods Select, SelectNew, Fill, and so on. . The SQL class. PeopleSoft Application Engine programs. Some Record class methods Insert, Update, and so on. . COBOL functions. Meta SQL Element Types There are three types of meta SQL elements Constructs are a direct substitution of a value, and help to build or modify a SQL statement. Examples include Bind, InsertSelect, and List. Functions perform actions or cause another function to be called. Examples include ClearCursor, Execute, and ExecuteEdits. Meta variables enable substitution of text within SQL statements. Examples include AsOfDate, Comma, and JobInstance. Meta SQL Placement Considerations Not all meta SQL can be used by all programs. Some meta SQL can be used only in Application Engine programs. Other meta SQL can only be used as part of a SQL statement in a SQL or dynamic view. The following table lists available meta SQL elements and where each element can be used. If a meta SQL construct, function, or meta variable is supported in PeopleCode, it is supported in all types of PeopleCode programs that is, in Application Engine PeopleCode programs actions , component interface PeopleCode programs, and so on. Note Even if a meta SQL element is used in PeopleCode, you cannot use meta SQL like a built in function. You can use meta SQL in the SQLExec function, the Select method, the Fill method, and so on. Note Meta SQL is not available in SQR DEFAULTSORT Meta Sql Category SQL ... more details
The SQL From clause is the source of a rowset to be operated upon in a Data Manipulation Language Data Manipulation Language DML statement. From clauses are very common, and will provide the rowset to be exposed through a Select SQL Select statement, the source of values in an Update SQL Update statement, and the target rows to be deleted in a Delete SQL Delete statement. code FROM code is an SQL reserved word in the SQL 2003 SQL standard The code FROM code clause is used in conjunction with SQL statements, and takes the following general form SQL DML Statement FROM table name WHERE predicate The From clause can generally be anything that returns a rowset, a table, view, function, or system provided information like the Information Schema , which is typically running proprietary commands and returning the information in a table form. ref cite web url http www.sqlteam.com article the from clause title The FROM Clause author Bill Graziano date 24 June 2002 ref Examples The following query returns only those rows from table mytable where the value in column mycol is greater than 100. source lang sql SELECT FROM mytable WHERE mycol 100 source Requirement The From clause is technically required in relational algebra and in most scenarios to be useful. However many relational DBMS implementations may not require it for selecting a single value, or single row. source lang sql SELECT 3.14 AS Pi source Other systems will require a From statement with a keyword, even to select system data. source lang sql select to char sysdate, Dy DD Mon YYYY HH24 MI SS as Current Time from dual source ref cite web url http infolab.stanford.edu ullman fcdb oracle or time.html title Oracle Dates and Times ref References reflist SQL DEFAULTSORT From Sql Category SQL keywords Category Articles with example SQL code database stub sq From SQL uk From SQL ... more details
SQL Plus commonly known as sqlplus is an Oracle database client that can run SQL and PL SQL commands and display their results. SQL Plus is the default, the simplest and the most basic Oracle utility, with a basic ... types SQL Plus understands three categories of text ref name CommandRef cite web url http www.orafaq.com faq sqlplus title SQL Plus at orafaq.com accessdate 2007 11 26 archiveurl http web.archive.org ... SQL statements PL SQL blocks SQL Plus internal commands, for example environment control commands .... An Oracle programmer in the appropriately configured software environment can launch SQL Plus, for example, by entering code sqlplus scott tiger code where the Oracle user code scott code has the password code tiger code . SQL Plus then presents a prompt with the default form of pre SQL> pre Interactive use can then start by entering a SQL statement terminated by a semicolon , a PL SQL block, or another ... pre History The first version of SQL Plus was called UFI User Friendly Interface . UFI appeared in Oracle ... name became Advanced UFI . The name Advanced UFI changed to SQL Plus before the release of this Which? date July 2009 version. As of 2012 1 the product continues to bear the name SQL Plus . Usage ... end users who depend on the SQL Plus environment. Oracle shops typically continue to use SQL Plus scripts ... gui fications replacements for SQL Plus include Oracle SQL Plus Worksheet, a component of Oracle Enterprise Manager OEM ref cite web url http docs.cs.cf.ac.uk html 601 node4.html title The SQL ... Oracle s SQL Plus Worksheet is a straight forward, easy to use, graphical user interface for SQL. ref ... is a web based utility similar to the SQL Plus command line utility for executing SQL and PL SQL commands available up to Oracle 10gR2 . ref SQL Worksheet, ref cite web url http www.oracle.com technology products database sql developer files featurelist 1 5.htm nf sql title Oracle SQL Developer 1.5 ... Oracle Corporation location pages language doi archiveurl archivedate quote The SQL Plus commands ... more details
of column C1 in table T to 1, only in those rows where the value of column C2 is a . source lang sql UPDATE T SET C1 1 WHERE C2 a source In table T , set the value of column C1 to 9 and the value of C3 to 4 for all rows for which the value of column C2 is a . source lang sql UPDATE T SET C1 9, C3 4 WHERE C2 a source Increase value of column C1 by 1 if the value in column C2 is a . source lang sql UPDATE T SET C1 C1 1 WHERE C2 a source Prepend the value in column C1 with the string text if the value in column C2 is a . source lang sql UPDATE T SET C1 text C1 WHERE C2 a source Set the value ... in column C3 in table T2 having the column C4 equal to 0. source lang sql UPDATE T1 SET C1 2 WHERE C2 IN SELECT C3 FROM T2 WHERE C4 0 source You may also update multiple columns in a single update statement source lang sql UPDATE T SET C1 1, C2 2 source Complex conditions and JOINs are also possible source lang sql UPDATE T SET A 1 WHERE C1 1 AND C2 2 source Some databases allow the non standard use of the FROM clause source lang sql UPDATE a SET a. updated column updatevalue FROM articles a JOIN classification c ON a.articleID c.articleID WHERE c.classID 1 source Or on Oracle systems assuming there is an index on classification.articleID source lang sql UPDATE SELECT FROM articles JOIN classification ON articles.articleID classification.articleID WHERE classification.classID 1 SET updated ... of UPDATE statements to become an infinite loop when the whereSQLWHERE clause and one or more SET ...An SQL UPDATE statement changes the data of one or more records in a Table database table . Either all the rows can be updated, or a subset may be chosen using a condition SQL condition . The code UPDATE ... ... code WHERE code condition For the code UPDATE code to be successful, the user must have data ... code CHECK code constraints , and Null SQL code NOT NULL code constraints . In some databases, such as PostgreSQL ... docs 8.1 static sql update.html ref Because of this indeterminacy, referencing other tables only within ... more details
Refimprove date December 2009 A relational database management system uses SQL conditions or Expression programming expressions in WhereSQL tt WHERE tt clauses and in Having SQL tt HAVING tt clauses to tt select SQL SELECT tt subsets of data. Types of condition Expand section date July 2010 Many conditions compare values for for example equality, inequality or similarity. The EXISTS condition uses the SQL 2003 SQL standard SQL keywords keyword code EXISTS code ref cite book last Fehily first Chris title SQL Visual Quickstart Guide edition 2 year 2005 publisher Peachpit Press isbn 978 0 321 33417 6 pages 439 440 pages 480 quote SQL Keywords ... The appendix lists the SQL 2003 standard s reserved and non reserved keywords. ... EXISTS ... ref to determine whether rows exist in a subquery result. ref cite book last Fehily first Chris title SQL Visual Quickstart Guide edition 2 year 2005 publisher Peachpit Press isbn 978 0 321 33417 6 page 278 pages 480 quote EXISTS and NOT EXISTS ... look for the existence or nonexistence of rows in a subquery result. ref Examples To tt SELECT tt one row of data from a table called tab with a primary key column pk set to 100 &mdash use the condition pk 100 SELECT FROM tab WHERE pk 100 To identify whether a table tab has rows of data with a duplicated key column dk set to 100 &mdash use the condition dk 100 and the condition having count 1 SELECT FROM tab WHERE dk 100 having count 1 SQL References Reflist DEFAULTSORT Condition Sql Category SQL ru SQL ... more details
In database query operations, various SQL implementations use hints as additions to the SQL standard that instruct the database engine on how to execute the query. For example, a hint may tell the engine to use as little memory as possible even if the query will run slowly , or to use or not to use an index database index even if the query optimizer would decide otherwise . Implementation Different database engines use different approaches in implementing hints. MySQL uses its own extension to the SQL standard, where a table database table name may be followed by tt USE INDEX tt , tt FORCE INDEX tt or tt IGNORE INDEX tt keywords. ref MySQL 5.5 Reference Manual http dev.mysql.com doc refman 5.5 en index hints.html 12.2.9.3 Index Hint Syntax ref Oracle Database Oracle implements hints by using specially crafted SQL Other comment s in the query that begin with a tt tt symbol, thus not affecting SQL compatibility. ref Mike Ault http www.dba oracle.com t sql hints tuning.htm Oracle SQL Hints Tuning ref See also Query optimizer Query plan References reflist DEFAULTSORT Hint Sql Category SQL database stub ru SQL ... more details
Transact SQL T SQL is Microsoft s and Sybase s proprietary extension to SQL . SQL, often expanded to Structured Query Language, is a SQL Standardization standardized computer language that was originally ... declarative statements. T SQL expands on the SQL standard to include Procedural programming ..., mathematics, etc. and changes to the Delete SQL DELETE and update SQL UPDATE statements. These additional features make Transact SQL Turing complete . Transact SQL is central to using Microsoft SQL Server . All applications that communicate with an instance of SQL Server do so by sending Transact SQL statements to the server, regardless of the user interface of the application. Flow control Keywords for flow control in Transact SQL include code BEGIN code and code END code , code BREAK code ... SQL, both the DELETE and UPDATE statements allow a FROM clause to be added, which allows joins .... syntaxhighlight lang tsql DELETE users FROM users as u INNER JOIN user flags as f ON u.id f.id WHERE f.name Idle syntaxhighlight BULK INSERT BULK INSERT is a Transact SQL statement that implements ... en us library ms188365.aspx Microsoft s MSDN page . TRY CATCH Beginning with SQL Server 2005, Microsoft ... enables developers to simplify their code and leave out ERROR checking after each SQL execution statement ... See also Adaptive Server Enterprise Adaptive Server Enterprise Sybase PL SQL PL SQL Oracle PL pgSQL ... 15.0.sqlug html sqlug title.htm Sybase Transact SQL User s Guide http msdn2.microsoft.com en us library aa260642 SQL.80 .aspx Transact SQL Reference for SQL Server 2000 MSDN http msdn2.microsoft.com en us library ms189826.aspx Transact SQL Reference for SQL Server 2005 MSDN http msdn.microsoft.com en us library bb510741 SQL.100 .aspx Transact SQL Reference for SQL Server 2008 MSDN Category SQL Category Data centric programming languages ar cs Transact SQL de Transact SQL es Transact SQL fr Transact SQL id Transact SQL is Transact SQL it Transact SQL ja Transact SQL pl Transact ... more details
Examples Delete rows from table pies where the column flavour equals Lemon Meringue source lang sql DELETE FROM pies WHERE flavour Lemon Meringue source Delete rows in trees , if the value of height is smaller than 80. source lang sql DELETE FROM trees WHERE height 80 source Delete all rows from mytable source lang sql DELETE FROM mytable source Delete rows from mytable using a subquery in the where condition source lang sql DELETE FROM mytable WHERE id IN SELECT id FROM mytable2 source Delete rows from mytable using a list of values source lang sql DELETE FROM mytable WHERE id IN value1 ... must be executed source lang sql DELETE FROM person WHERE pid 1 DELETE FROM pa WHERE pid 1 source To maintain ... would be deleted from pa . Then the first statement source lang sql DELETE FROM person WHERE pid 1 source would automatically trigger the second source lang sql DELETE FROM pa WHERE pid 1 source Related ...In the database structured query language SQL , the DELETE statement removes one or more records from a Table database table . A subset may be defined for deletion using a condition, otherwise all records are removed. ref cite web url http www.w3schools.com Sqlsql delete.asp title SQL Delete Statement publisher w3schools.com ref Usage The code DELETE code statement follows the syntax code DELETE code code FROM code table name code WHERE code condition Any rows that match the WhereSQL code WHERE code condition will be removed from the table. If the code WHERE code clause is omitted, all rows in the table ... 2009 offer a Truncate SQL TRUNCATE TABLE command that works a lot quicker, as it only alters metadata ... the rows. For deleting a table entirely the Drop SQL DROP command can be used. References reflist SQL DEFAULTSORT Delete Sql Category SQL keywords Category Articles with example SQL code cs DELETE ko Delete SQL lv Delete SQL nl Delete SQL ja DELETE SQL no Delete SQL pt Delete SQL ru Delete SQL sq Delete SQL sr Delete SQL uk Delete SQL zh SQL ... more details
SQL 2008 can refer to SQL 2008 , the SQL standard adopted in 2008 SQL Server 2008, a release of Microsoft SQL Server Letter NumberCombDisambig ... more details
wiktionary whereWhere may refer to Where?, in journalism, one of the Five Ws WhereSQL , a database language clause Where.com , a provider of location based applications via mobile phones See also Ware disambiguation Wear disambiguation Were disambiguation disambig ... more details
LATERAL VALUES 1 AS t c source Oracle PL SQL supports the INSERT ALL statement, where multiple insert statements are terminated by a SELECT ref cite web url http psoug.org snippet Oracle PL SQL INSERT ALL 589.htm title Oracle PL SQL INSERT ALL work psoug.org accessdate 2010 09 02 ref source lang sql INSERT ALL INTO phone book VALUES John Doe , 555 1212 INTO phone book VALUES Peter Doe , 555 2323 ... lang sql INSERT INTO phone book2 SELECT FROM phone book WHERE name IN John Doe , Peter Doe source ...An SQL INSERT statement adds one or more records to any single Table database table in a relational database ... s, Check Constraint code CHECK code constraints , and Null SQL code NOT NULL code constraints . If a syntax ... returned instead. Example source lang sql INSERT INTO phone book name, number VALUES John ... be after the first 2 in the table. source lang sql INSERT INTO phone book VALUES John Doe , 555 1212 source Advanced forms Multirow inserts A SQL feature since SQL 92 is the use of row value constructors to insert multiple rows at a time in a single SQL statement source lang sql INSERT INTO table column ... is supported by IBM DB2 DB2 , Microsoft SQL Server SQL Server since version 10.0 i.e. 2008 ... that name and number are the only columns in the phone book table source lang sql INSERT INTO phone ... statements source lang sql INSERT INTO phone book VALUES John Doe , 555 1212 INSERT INTO phone ... performance as a single multi row insert. To insert multiple rows in MS SQL you can use such a construction source lang sql INSERT INTO phone book SELECT John Doe , 555 1212 UNION ALL SELECT Peter Doe , 555 2323 source Note that this is not a valid SQL statement according to the SQL standard SQL ... consists of a single row only source lang sql INSERT INTO phone book SELECT John Doe , 555 1212 ... of this logic shows the following example, or as shown above source lang sql INSERT INTO phone book ... like this source lang sql INSERT INTO phone book name , number SELECT John Doe , 555 1212 FROM RDB ... more details
PL SQL Procedural Language Structured Query Language is Oracle Corporation s Procedural programming procedural extension programming language language for SQL and the Oracle Database Oracle relational database . PL SQL s general Syntax programming languages syntax resembles that of Ada programming language Ada or Pascal programming language Pascal . PL SQL is one of three key programming languages embedded in the Oracle Database, along with SQL itself and Java programming language Java . PL SQL is available ... dm 0907oracleappsondb2 index.html ref Introduction PL SQL supports variable programming variable s, Conditional ... data type Array s are also supported, though in a somewhat unusual way, involving the use of PL SQL collections. PL SQL collections is a slightly advanced topic. Implementations from version 8 of Oracle Database onwards have included features associated with Object PL SQL object orientation . PL SQL ... thus embed PL SQL units of functionality into the database directly. They also can write scripts containing PL SQL program units that can be read into the database using the Oracle SQL Plus tool. Once ... SQL code using straightforward SQL statements, Data Definition Language DDL requires more complex Dynamic SQL statements to be written in the PL SQL code. However, DML statements underpin the majority of PL SQL code in typical software applications. In the case of PL SQL dynamic SQL, early versions of the Oracle Database required the use of a complicated Oracle code DBMS SQL code package library. More recent versions have however introduced a simpler Native Dynamic SQL , along with an associated ... with each successive release of the Oracle Database. PL SQL program units Anonymous blocks ... form the basis of the simplest PL SQL code, and have the following structure source lang PLSQL label ... where they have determined that it is impossible for normal execution to continue. code RAISE code ... has a SQL Error Number and SQL Error Message associated with it. Programmers can access these by using ... more details
lang csharp statement SELECT FROM users WHERE name userName source This SQL code is designed to pull ... SELECT FROM users WHERE name or 1 1 source source lang sql SELECT FROM users WHERE name or 1 1 source ... WHERE name a DROP TABLE users SELECT FROM userinfo WHERE t t source While most SQL server implementations ... the SQL would be rendered as follows source lang sql SELECT FROM userinfo WHERE id 1 DROP TABLE users ... statement on an ordinary application screen. source lang sql SELECT booktitle FROM booklist WHERE bookId ... users WHERE username ooo source Another type of blind SQL injection uses a conditional timing delay ...Use mdy dates date February 2012 SQL injection is an often used technique to attack databases through a website. This is done by including portions of SQL statements in a web form entry field in an attempt to get the website to pass a newly formed rogue SQL command to the database e.g. dump the database contents to the attacker . SQL injection is a code injection technique that exploits a security ... filtered for string literal escape sequences escape characters embedded in SQL statements or user input is not Strongly typed programming language strongly typed and unexpectedly executed. SQL commands ... to the attacker. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database. In operational environments, it has been noted that applications ... 09 sql injection by the numbers.html ref When under direct attack, some applications occasionally came ... Forms and Validity SQL Injection Attack SQLIA is considered one of the top 10 web application ... depending on the technical aspects of the attack s deployment Classic SQLIA Inference SQL Injection Interacting with SQL Injection DBMS specific SQLIA Compounded SQLIA Some security researchers ... Joe McCray Advanced SQL Injection LayerOne 2009 publisher YouTube date accessdate 2011 06 03 ref ... is a new term derived from research on SQL Injection Attacking Vector in combination with other ... more details
In SQL , the code TRUNCATE TABLE code statement is a Data Definition Language DDL operation that marks the extents of a table for deallocation empty for reuse . The result of this operation quickly removes all data from a Table database table , typically bypassing a number of integrity enforcing mechanisms. It was officially introduced in the SQL 2008 standard. The code TRUNCATE TABLE mytable code statement is logically though not physically equivalent to the code Delete SQL DELETE FROM mytable code statement without a code WhereSQLWHERE code clause . The following characteristics distinguish code TRUNCATE TABLE code from code DELETE code In the Oracle Database , code TRUNCATE code is implicitly preceded and followed by a Commit data management commit operation. This may also be the case in MySQL , depending on the chosen storage engine. Typically, code TRUNCATE TABLE code quickly deletes all records in a table by deallocating the data pages used by the table. This reduces the resource overhead of Transaction log logging the deletions, as well as the number of Lock database locks acquired. Records removed this way cannot be restored in a rollback operation. Two notable exceptions to this rule are the implementations found in PostgreSQL and Microsoft SQL Server , both of which allow code TRUNCATE TABLE code statements to be committed or rolled back transactionally. You cannot specify a code WHERE code clause in a code TRUNCATE TABLE code statement it is all or nothing. code TRUNCATE TABLE code cannot be used when a foreign key references the table to be truncated, since code ... SQL Server 2000 and beyond in full recovery mode, every change to the database is logged, so code TRUNCATE ... on transaction log backup and the restore process in SQL Server publisher Microsoft date December 2005 ref References references Notes SQL DEFAULTSORT Truncate Sql Category SQL keywords database stub compu lang stub cs TRUNCATE hr Truncate SQL ja TRUNCATE SQL ru Truncate SQL uk Truncate SQL ... more details
A relational database management system uses SQL code MERGE code upsert statements to code insert SQL INSERT code new records or code update SQL UPDATE code existing records depending on whether or not a condition SQL condition matches. It was officially introduced in the SQL 2003 standard, and expanded in the SQL 2008 standard. Usage source lang sql MERGE INTO table name USING table reference ON condition WHEN MATCHED THEN UPDATE SET column1 value1 , column2 value2 ... WHEN NOT MATCHED THEN INSERT column1 , column2 ... VALUES value1 , value2 ... source Join SQL Right outer join Right join is employed .... If multiple Source rows match a given Target row, an error is mandated by SQL 2003 standards. You ... systems Oracle Database , IBM DB2 DB2 , Teradata and MS SQL support the standard syntax. Some also add non standard SQL extensions. Synonymous Some database implementations adopted the term Upsert ... in Microsoft SQL Azure and MongoDB . The SQL 2003 defines a code MERGE code statement that provides ... KEY UPDATE code where the row is updated if already inserted syntax. Frequently, database operations are performed in a context where multiple agents can perform queries on the same database ... similar behavior, through their own, non standard SQL extensions. MySQL , for example, supports the use ... code Guard computing guards . Microsoft SQL extends with supporting guards and also with supporting ... cite web title Cross Compare of SQL Server, MySQL, and PostgreSQL date May 18, 2008 url http www.postgresonline.com journal archives 51 Cross Compare of SQL Server, MySQL, and PostgreSQL.html work Postgres ... DB2 v9 MERGE statement http msdn.microsoft.com en us library bb510625.aspx SQL Server 2008 documentation http www.h2database.com html grammar.html merge H2 1.2 SQL Syntax page SQL DEFAULTSORT Merge Sql Category SQL keywords Category Articles with example SQL code database stub cs MERGE lv Merge SQL ja MERGE SQL ru Merge SQL ... more details
The following simple example demonstrates this fallacy source lang sql SELECT FROM t WHERE i ... lang sql SELECT FROM sometable WHERE num 1 Rows where num is NULL will not be returned, contrary ... sql SELECT FROM stuff WHERE x IS NOT NULL source While ignoring the law of the excluded middle does ... Null in database theory . Null is a special marker used in SQL Structured Query Language SQL to indicate ... relational database model, Edgar F. Codd E. F. Codd , SQL Null serves to fulfill the requirement ... Greek omega symbol to represent Null in database theory . code NULL code is also an SQL reserved ... requirements for its use in Join SQLSQL joins , and the special handling required by aggregate functions and SQL grouping operators. Although special functions and predicates are provided to properly ... Management, Version 2 that the single Null mandated by the SQL standard was inadequate, and should ... Wesley Publishing Company isbn 0 201 14192 2 ref Codd s recommendation would have required SQL s logic ... to Null, is Unknown source lang sql SELECT 10 NULL Results in Unknown source However, certain operations ... circuited form source lang sql SELECT TRUE OR NULL Results in True source In this case, the fact ... would be True regardless of the value on the right. SQL implements three logical results, so SQL ... SQL three valued logic are shown in the tables below p and q represent logical states ref name fourrules cite journal last Coles, Michael title Four Rules for Nulls journal SQL Server Central ... ref Image 3VL Truth Table.png 600px thumb right SQL Ternary logic three valued logic 3VL truth table . Basic SQL comparison operators always return Unknown when comparing anything with Null, so the SQL standard provides for two special Null specific comparison predicates. The code ... SQL2003 Part2 Sec87 cite book last ISO IEC title ISO IEC 9075 2 2003, SQL Foundation publisher ISO IEC year 2003 pages Section 8.7 null predicate nopp true ref Data typing Null is untyped in SQL, meaning ... more details
The SQL MED , or Management of External Data , extension to the SQL standard is defined by ISO IEC 9075 9 2003. SQL MED provides extensions to SQL that define foreign data wrappers and datalink types to allow SQL to manage external data . External data is data that is accessible to, but not managed by, an SQL based DBMS . This standard can be used in the development of federated database system s. Implementations PostgreSQL has support for some SQL MED since version 9.1. 9.2 supports more ref http wiki.postgresql.org wiki SQL MED PostgreSQL Wiki SQL MED ref . See also SQLSQL 2003 References references External links http www.sigmod.org publications sigmod record 0209 jimmelton.pdf view SQL MED A Status Report Category SQLSQL database stub ru SQL MED ... more details
constraints. The SELECT statement has many optional clauses code WhereSQLWHERE code specifies which rows to retrieve. code Group by SQL GROUP BY code groups rows sharing a property so that an aggregate function can be applied to each group. code Having SQL HAVING code selects among the groups defined by the GROUP BY clause. code Order by SQL ORDER BY code specifies an order in which to return ... . The SQL SELECT statement returns a result set of records from one or more Table database tables . ref cite web url http msdn2.microsoft.com en us library ms189499.aspx title Transact SQL Syntax ... select.html title SQL SELECT Syntax accessdate author MySQL ref A SELECT statement retrieves zero or more ... applications, code SELECT code is the most commonly used Data Manipulation Language DML command. As SQL ... gray text align center C1 C2 1 a 2 b code SELECT FROM T WHERE C1 1 code align center cellpadding ... code SELECT FROM T WHERE C1 1 code will result in all the elements of all the rows where the value of column ... will be performed, because of the WHERE clause. This is also known as a Horizontal Partition, restricting ... to do this often varies per vendor. In International Organization for Standardization ISO SQL 2003 , result sets may be limited by using Cursor databases cursors , or By introducing SQL window function to the SELECT statement ISO SQL 2008 introduced the code FETCH FIRST code clause. ROW NUMBER ... to return no more than ten rows source lang sql SELECT FROM SELECT ROW NUMBER OVER ORDER BY sort key ASC AS row number, columns FROM tablename foo WHERE row number 10 source ROW NUMBER can be Nondeterministic ... to get different row numbers assigned to any rows where sort key is the same. When sort key ... to return the top 10 youngest persons source lang sql SELECT FROM SELECT RANK OVER ORDER BY age ASC AS ranking, person id, person name, age FROM person foo WHERE ranking 10 source The above code ... rows. FETCH FIRST clause Since ISO SQL 2008 results limits can be specified as in the following example ... more details
SQL Server may refer to Microsoft SQL Server , a relational database server from Microsoft Sybase SQL Server , a relational database server developed by Sybase SQL Server magazine SQL Server magazine , a trade publication and web site owned by Penton Media Any database server that implements the SQL Structured Query Language disambig Category Servers computing cs SQL Server hr SQL Server it SQL Server nl SQL Server ja SQL Server ro SQL Server ru SQL Server uk SQL Server ... more details
SQL Developer may refer to Oracle SQL Developer , a free SQL IDE from Oracle Corporation PL SQL Developer, an IDE for PL SQL development from Allround Automations SOLYP SQL Developer, a generic proprietary database tool written by Jan Borchers disambig ... more details
unreferenced date July 2010 The SQL CLI , or Call Level Interface , is an extension to the SQL standard is defined in SQL 1999 based on CLI 95 , but also available in later editions such as ISO IEC 9075 3 2003. This extension defines common interfacing components structures and procedures that can be used to execute SQL statements from applications written in other programming languages. The SQL CLI extension is defined in such a way that SQL statements and SQL CLI procedure calls are treated as separate from the calling application s source code. See also Call Level Interface SQLSQL 2003 References Empty section date July 2010 External links Category SQLSQL database stub ru SQL CLI ... more details
The SQL Schemata , or Information and Definition Schemas , part to the SQL standard is defined by ISO IEC 9075 11 2008. SQL Schemata defines the Information Schema and Definition Schema, providing a common set of tools to make SQL database databases and objects self describing. These tools include the SQL object identifier, structure and integrity constraints , security and authorization specifications, features and packages of ISO IEC 9075, support of features provided by SQL based DBMS implementations, SQL based DBMS implementation information and sizing items, and the values supported by the DBMS implementations. ref name ISO IEC 9075 11 2008 Citation title ISO IEC 9075 11 2008 Information and Definition Schemas SQL Schemata pages p. 1 year 2008 ref . SQL Schemata defines a number of features, some of which are mandatory. See also Data Definition Language CREATE, ALTER, DROP... SQL 2003 Introduced SQL Schemata Data dictionary References references External links Category SQLSQL database stub ru SQL Schemata ... more details
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