44 lines
1.2 KiB
Plaintext
44 lines
1.2 KiB
Plaintext
.\" This is -*-nroff-*-
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.\" XXX standard disclaimer belongs here....
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.\" $Header: /cvsroot/pgsql/src/man/Attic/update.l,v 1.2 1996/12/11 00:28:13 momjian Exp $
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.TH UPDATE SQL 11/05/95 PostgreSQL PostgreSQL
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.SH NAME
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update \(em replace values of attributes in a class
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.SH SYNOPSIS
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.nf
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\fBupdate\fR classname \fBset\fR attname-1 = expression-1,
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{attname-i = expression-i}
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[\fBfrom\fR from-list]
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[\fBwhere\fR qual]
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.fi
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.SH DESCRIPTION
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.BR Update
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changes the values of the attributes specified
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for all instances which satisfy the qualification,
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.IR qual .
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Only the attributes to be modified need appear as atributes.
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.PP
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Array references use the same syntax found in
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.IR select(l).
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That is, either single array elements, a range of array elements or
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the entire array may be replaced with a single query.
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.IR from-list
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is a non-standard extension to allow columns from
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other tables to appear in the target_list.
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.PP
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You must have write access to the class in order to modify it, as well
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as read access to any class whose values are mentioned in the target list
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or qualification.
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.SH EXAMPLES
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.nf
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--
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--Give all employees who work for Smith a 10% raise
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--
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update emp
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set sal = 1.1 * sal
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where mgr = 'Smith'
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.fi
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.SH "SEE ALSO"
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create table(l),
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select(l).
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