At 15:37 -0200 2/9/05, Gabriel B. wrote:
On Wed, 09 Feb 2005 17:24:10 +0000, love <[EMAIL PROTECTED]> wrote:
alter table table_name add index (birthday);
But would that index improve this kind of query? the docs talk about
only direct matchs, like "birthday < now()" or" birthday between x and
y". They're all full date values.
It won't help except for queries that test the value of birthday directly.
As soon as you use the column in a calculation such as a function call,
the index can't be used.
To use month in indexed fashion, you could store dates as separate
year, month, and date columns. But that might be more of a hassle
than you want to deal with.
--
Paul DuBois, MySQL Documentation Team
Madison, Wisconsin, USA
MySQL AB, www.mysql.com
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