[EMAIL PROTECTED] wrote:
Hi all,
I've got a question. We were testing something on our mysql server (
4.0.21) with MyISAM tables.
When we executed the query "select * from people where name like '';" we
expected the same results as "select * from people where name='';" but it
didn't.
The like function returned everything instead of only the people without a
name. Is this known (and correct) behaviour? It does not sound logical to
me. I couldn't find anything about it on the mysql website.
Usually, pattern matching done where a pattern is nothing matches everything.
Use LIKE for pattern matching, and = for equivalency.
I don't know what the ANSI SQL spec says here, and whether our behavior
is correct there, but this behavior makes sense to me at least. I would
expect similar behavior from perl, for example:
$ perl -e 'my $a = qw(a); print $a =~ //;'
1
Regards,
Josh
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Josh Chamas
Director, Professional Services
MySQL Inc., www.mysql.com
Get More with MySQL! www.mysql.com/consulting
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