From: Tom Lane <tgl@sss.pgh.pa.us>
To: email_daniel_h@yahoo.com.br
Cc: pgsql-sql@postgresql.org
Subject: Re: Help to simplify sample query
Date: Tue, 09 Mar 2004 01:27:33 -0500
Message-ID: <21339.1078813653@sss.pgh.pa.us> (raw)
In-Reply-To: <404D5920.40104@yahoo.com.br>
References: <404D5920.40104@yahoo.com.br>
Daniel Henrique Alves Lima <email_daniel_h@yahoo.com.br> writes:
> I don't think this is possible, but: Is there a efficient way to
> compare if the result of a query is a superset of the result of another ?
Perhaps do "SELECT foo EXCEPT SELECT bar" and see if you get anything?
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, email_daniel_h@yahoo.com.br
Subject: Re: Help to simplify sample query
In-Reply-To: <21339.1078813653@sss.pgh.pa.us>
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