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Re: ORDER BY col is NULL in UNION causes error? - Mailing list pgsql-general

From Tom Lane
Subject Re: ORDER BY col is NULL in UNION causes error?
Date
Msg-id 28703.1168543498@sss.pgh.pa.us
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In response to Re: ORDER BY col is NULL in UNION causes error?  (Bruce Momjian <bruce@momjian.us>)
Responses Re: ORDER BY col is NULL in UNION causes error?  (Bruce Momjian <bruce@momjian.us>)
List pgsql-general
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Bruce Momjian <bruce@momjian.us> writes:
> Well, it can be an expression _if_ the expression _matches_ an existing
> UNION column.

You're mistaken.  It has to be *an output column name*.  Not anything else.

            regards, tom lane

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