42 lines
1.1 KiB
Plaintext
42 lines
1.1 KiB
Plaintext
.\" This is -*-nroff-*-
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.\" XXX standard disclaimer belongs here....
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.\" $Header: /cvsroot/pgsql/doc/man/Attic/delete.l,v 1.1.1.1 1996/08/18 22:14:23 scrappy Exp $
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.TH DELETE SQL 11/05/95 Postgres95 Postgres95
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.SH NAME
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delete \(em delete instances from a class
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.SH SYNOPSIS
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.nf
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\fBdelete\fR instance_variable [ \fBfrom\fR from_list ] [ \fBwhere\fR qual ]
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.fi
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.SH DESCRIPTION
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.BR Delete
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removes instances which satisfy the qualification,
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.IR qual ,
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from the class specified by
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.IR instance_variable .
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.IR Instance_variable
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is either a class name or a variable assigned by
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.IR from_list .
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If the qualification is absent, the effect is to delete all instances
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in the class. The result is a valid, but empty class.
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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 read in the qualification
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(see
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.IR "change acl" (l).
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.SH EXAMPLE
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.nf
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--
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--Remove all employees who make over $30,000
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--
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delete from emp where emp.sal > 30000
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.fi
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.nf
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--
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--Clear the hobbies class
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--
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delete from hobbies
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.fi
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.SH "SEE ALSO"
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drop(l).
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