| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Rod Taylor <rbt(at)rbt(dot)ca> |
| Cc: | Mario Weilguni <mario(dot)weilguni(at)icomedias(dot)com>, "Postgresql " Mailinglist "" (E-Mail) <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: interesting difference for queries... |
| Date: | 2002-12-04 17:22:15 |
| Message-ID: | 15259.1039022535@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Rod Taylor <rbt(at)rbt(dot)ca> writes:
>> cms=# CREATE TABLE foo(bar int);
>> CREATE
>> cms=# SELECT * from foo where bar=1.7;
> This is a numeric to integer coercion, which rounds
No, it's an integer to numeric promotion (the var is promoted, not the
constant). Obviously the '=' can never return true in this case.
>> cms=# SELECT * from foo where bar='1.7';
>> ERROR: pg_atoi: error in "1.7": can't parse ".7"
> This is a text to integer coercion, which doesn't round.
And should not, IMHO. This is effectively the same as
... where bar = '1.7'::int
which it seems to me is quite correct to throw a bad-input error.
regards, tom lane
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