From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
---|---|
To: | "T(dot)J(dot)Farrell" <T(dot)J(dot)Farrell(at)wanadoo(dot)fr> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: LIKE vrs ~~ |
Date: | 2000-06-04 01:46:22 |
Message-ID: | Pine.LNX.4.21.0006040326220.348-100000@localhost.localdomain |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-sql |
T.J.Farrell writes:
> I was wondering about the performance incidence of :
> SELECT * FROM table1 WHERE UPPER(field1) LIKE UPPER('%thomas%');
> versus:
> SELECT * FROM table1 WHERE field1 ~~ '%thomas%'
If you're comparing ~~ with LIKE then there's no difference at all. (Only
the extra cycles to convert LIKE to ~~ internally.) If you're comparing
true case-insensitive matching to using UPPER, then the latter is probably
faster but doesn't really do the same thing.
--
Peter Eisentraut Sernanders väg 10:115
peter_e(at)gmx(dot)net 75262 Uppsala
http://yi.org/peter-e/ Sweden
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2000-06-04 19:19:11 | Re: LIKE vrs ~~ |
Previous Message | qzhwjb | 2000-06-04 00:24:50 | Ho Ho Ho !!! 6684 |