They do use indexes if you use them to build derived tables and are
pretty fast. The only case where I see them not using indexes when I
think they should is when you use a sub-query for an IN() clause.
Kevin Burton wrote:
OK...
Subqueries in 4.1 are totally broken. They don't use indexes. They're
evil. We're told we have subqueries but there's no way anyone on earth
could use them. To make matters worse a lot of developers are TRICKED
into using them and assume that mysql would do the right thing but its a
HUGE performance hit.
So...
1. When will subqueries that actually use indexes be implemented?
We've been promised this feature since 4.0.... it was one of the biggest
feature wins of 4.1.
2. If they won't be in 5.0 could you please abandon a feature for 5.0
and concentrate on subqueries?
3. If they won't be in 5.0 could you at least be honest and remove this
feature since in the best case its useless and in the worse case its
dangerous (god forbid someone should ship code that uses this)?
Not trying to be obnoxious here but I really want this feature and the
current implementation is very...... evil.
:)
Kevin
--
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
