From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-hackers(at)postgreSQL(dot)org |
Subject: | Re: [HACKERS] "op must return bool to be used with subquery"? |
Date: | 1999-05-10 05:05:48 |
Message-ID: | 199905100505.BAA24024@candle.pha.pa.us |
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Lists: | pgsql-hackers |
> Given
> create table t1 (name text, value float8);
>
> this fails:
> SELECT name, value FROM t1 as touter WHERE
> (value/(SELECT AVG(value) FROM t1 WHERE name = touter.name)) > 0.75;
> ERROR: parser: '/' must return 'bool' to be used with subquery
Aren't you really saying WHERE col / (subselect). That doesn't return
bool, so the message seems correct.
We don't allow subselects in target lists, or inside expressions.
>
> The code in parse_expr.c that produces this message claims to be
> enforcing that "sub-selects can only be used in WHERE clauses".
> Either the comment is inaccurate or the test is too restrictive.
> If the test is correct then I think the error message is unhelpful.
> Anybody understand this code well enough to know what's really going on?
>
> regards, tom lane
>
>
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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