Order of WHERE clauses

[G.Bloke]

Ok this is something I've wondered about for a while but I've never come across the answer. Does MySQL process WHERE clauses in the order they are given in a select/update string or not?

I ask because if they are processed in the order given in a SELECT string then this will impact efficiency, therefore it would be useful to know so I can improve my scipts.

[gerilya]

In mysql tool, precede a SELECT statement with EXPLAIN to get information about a SELECT.

More here: http://www.mysql.com/doc/en/EXPLAIN.html