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DROP_CAST.7
'\" t .\" Title: DROP CAST .\" Author: The PostgreSQL Global Development Group .\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/> .\" Date: 2023 .\" Manual: PostgreSQL 13.13 Documentation .\" Source: PostgreSQL 13.13 .\" Language: English .\" .TH "DROP CAST" "7" "2023" "PostgreSQL 13.13" "PostgreSQL 13.13 Documentation" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" DROP_CAST \- remove a cast .SH "SYNOPSIS" .sp .nf DROP CAST [ IF EXISTS ] (\fIsource_type\fR AS \fItarget_type\fR) [ CASCADE | RESTRICT ] .fi .SH "DESCRIPTION" .PP \fBDROP CAST\fR removes a previously defined cast\&. .PP To be able to drop a cast, you must own the source or the target data type\&. These are the same privileges that are required to create a cast\&. .SH "PARAMETERS" .PP IF EXISTS .RS 4 Do not throw an error if the cast does not exist\&. A notice is issued in this case\&. .RE .PP \fIsource_type\fR .RS 4 The name of the source data type of the cast\&. .RE .PP \fItarget_type\fR .RS 4 The name of the target data type of the cast\&. .RE .PP CASCADE .br RESTRICT .RS 4 These key words do not have any effect, since there are no dependencies on casts\&. .RE .SH "EXAMPLES" .PP To drop the cast from type text to type int: .sp .if n \{\ .RS 4 .\} .nf DROP CAST (text AS int); .fi .if n \{\ .RE .\} .SH "COMPATIBILITY" .PP The \fBDROP CAST\fR command conforms to the SQL standard\&. .SH "SEE ALSO" CREATE CAST (\fBCREATE_CAST\fR(7))