Select (SQL): Difference between revisions

Revision as of 14:04, 6 August 2023

Revision as of 13:36, 24 August 2023

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{{Short description|SQL statement that returns a result set of records from one or more tables}}

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 Conventions |author=Microsoft |date=23 May 2023 }}</ref><ref>{{cite web |url=http://dev.mysql.com/doc/refman/5.0/en/select.html|title=SQL SELECT Syntax |author=MySQL}}</ref>

A SELECT statement retrieves zero or more rows from one or more [[Database Tables|database tables]] or database [[View (database)|views]]. In most applications, <code>SELECT</code> is the most commonly used [[data manipulation language]] (DML) command. As SQL is a [[declarative programming]] language, <code>SELECT</code> queries specify a result set, but do not specify how to calculate it. The database translates the query into a "[[query plan]]" which may vary between executions, database versions and database software. This functionality is called the "[[query optimizer]]" as it is responsible for finding the best possible execution plan for the query, within applicable constraints.

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{{cite book

| title = SAS 9.4 SQL Procedure User's Guide

| date=10 July 2013 | url = https://books.google.com/books?id=ESjMAAAAQBAJ

| publisher = SAS Institute

| publication-date = 2013