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Quirks in Sorting Pg_description 2+ messages / 2 participants [nested] [flat]
* Quirks in Sorting Pg_description @ 2010-03-03 14:15 P <user2037@live.com> 0 siblings, 1 reply; 2+ messages in thread From: P @ 2010-03-03 14:15 UTC (permalink / raw) To: pgsql-admin The following query works from Psql's prompt but not from Psql's "-c" command or from PHP's PDO interface. SELECT description FROM pg_catalog.pg_description WHERE description SIMILAR TO '\d+' ORDER BY description::integer DESC LIMIT 1; The result should be the description with the highest integer value. Instead it appears to be sorting like text even though it has been cast to an integer. Anyone know of a workaround? ^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Quirks in Sorting Pg_description @ 2010-03-03 15:13 Tom Lane <tgl@sss.pgh.pa.us> parent: P <user2037@live.com> 0 siblings, 0 replies; 2+ messages in thread From: Tom Lane @ 2010-03-03 15:13 UTC (permalink / raw) To: P <user2037@live.com>; +Cc: pgsql-admin P <user2037@live.com> writes: > The following query works from Psql's prompt but not from Psql's "-c" > command or from PHP's PDO interface. > SELECT description FROM pg_catalog.pg_description WHERE description > SIMILAR TO '\d+' ORDER BY description::integer DESC LIMIT 1; 1. I think you'll find that "SIMILAR TO '\d+'" doesn't do what you think; or at least, if it does, that's an implementation artifact not to be relied on. Use a POSIX regex operator instead. 2. Perhaps the context sensitivity of the behavior is explained by the shell or PHP eating the backslash? It certainly seems like you're at risk for different numbers of levels of backslash processing in these cases. regards, tom lane ^ permalink raw reply [nested|flat] 2+ messages in thread
end of thread, other threads:[~2010-03-03 15:13 UTC | newest] Thread overview: 2+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2010-03-03 14:15 Quirks in Sorting Pg_description P <user2037@live.com> 2010-03-03 15:13 ` Tom Lane <tgl@sss.pgh.pa.us>
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