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<REFENTRY ID="SQL-DELETE">
<REFMETA>
<REFENTRYTITLE>
DELETE
</REFENTRYTITLE>
<REFMISCINFO>SQL - Language Statements</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>
DELETE
</REFNAME>
<REFPURPOSE>
Deletes rows from a table
</REFPURPOSE>
</refnamediv>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1998-04-15</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
DELETE FROM <REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE> [ WHERE <REPLACEABLE CLASS="PARAMETER">condition</REPLACEABLE> ]
</SYNOPSIS>
<REFSECT2 ID="R2-SQL-DELETE-1">
<REFSECT2INFO>
<DATE>1998-04-15</DATE>
</REFSECT2INFO>
<TITLE>
Inputs
</TITLE>
<PARA>
</PARA>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
<replaceable class="parameter">table</replaceable>
</TERM>
<LISTITEM>
<PARA>
The name of an existing table.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
<replaceable class="parameter">condition</replaceable>
</TERM>
<LISTITEM>
<PARA>
This is an SQL selection query which returns the rows which
are to be deleted.
</PARA>
<PARA>
Refer to the SELECT statement for further description
of the WHERE clause.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</variablelist>
</REFSECT2>
<REFSECT2 ID="R2-SQL-DELETE-2">
<REFSECT2INFO>
<DATE>1998-04-15</DATE>
</REFSECT2INFO>
<TITLE>
Outputs
</TITLE>
<PARA>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
<ReturnValue> DELETE <replaceable class="parameter">count</replaceable></ReturnValue>
</TERM>
<LISTITEM>
<PARA>
Message returned if items are successfully deleted. The
<replaceable class="parameter">count</replaceable> is the number
of rows deleted.
</PARA>
<PARA>
If <replaceable class="parameter">count</replaceable> is 0,
no rows were deleted.
</para>
</listitem>
</varlistentry>
</VARIABLELIST>
</para>
</REFSECT2>
</REFSYNOPSISDIV>
<REFSECT1 ID="R1-SQL-DELETE-1">
<REFSECT1INFO>
<DATE>1998-04-15</DATE>
</REFSECT1INFO>
<TITLE>
Description
</TITLE>
<PARA>
DELETE removes rows which satisfy the WHERE <replaceable class="parameter">condition</replaceable>,
from the specified table.
</PARA>
<PARA>
If the <replaceable class="parameter">condition</replaceable> is absent,
the effect is to delete all rows in the table.
The result is a valid, but empty table.
</PARA>
<PARA>
You must have write access to the table in order to modify
it, as well as read access to any table whose values are
read in the <replaceable class="parameter">condition</replaceable>.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-SQL-DELETE-2">
<TITLE>
Usage
</TITLE>
<PARA>
Remove all films but musicals:
</PARA>
<ProgramListing>
DETETE FROM films WHERE kind <> 'Musical';
SELECT * FROM films;
code |title |did| date_prod|kind |len
-----+-------------------------+---+----------+----------+------
UA501|West Side Story |105|1961-01-03|Musical | 02:32
TC901|The King and I |109|1956-08-11|Musical | 02:13
WD101|Bed Knobs and Broomsticks|111| |Musical | 01:57
(3 rows)
</ProgramListing>
<para>
Clear the table <literal>films</literal>:
</para>
<programlisting>
DELETE FROM films;
SELECT * FROM films;
code|title|did|date_prod|kind|len
----+-----+---+---------+----+---
(0 rows)
</programlisting>
</REFSECT1>
<REFSECT1 ID="R1-SQL-DELETE-3">
<TITLE>
Compatibility
</TITLE>
<PARA>
</PARA>
<REFSECT2 ID="R2-SQL-DELETE-4">
<REFSECT2INFO>
<DATE>1998-04-15</DATE>
</REFSECT2INFO>
<TITLE>
SQL92
</TITLE>
<PARA>
<acronym>SQL92</acronym> allows a positioned DELETE statement:
</PARA>
<synopsis>
DELETE FROM <replaceable class="parameter">table</replaceable> WHERE CURRENT OF <replaceable class="parameter">cursor</replaceable>
</synopsis>
<para>
where <replaceable class="parameter">cursor</replaceable> identifies an open cursor. Interactive cursors in <productname>Postgres</productname> are read-only.
</para>
</refsect2>
</refsect1>
</REFENTRY>
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