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index clarification

If I have a table with two indexes: indexA table(A), and indexB
table(B), and I create indexAB table(A, B) it produces two indexes, A
and B. Can I drop the indexes created earlier on those individual
fields and have mysql use the two indexes created by the create indexAB
command?

thx,

r

Oct 7 '05 #1
1 1196
rl***@interfold.com wrote:
If I have a table with two indexes: indexA table(A), and indexB
table(B), and I create indexAB table(A, B) it produces two indexes, A
and B. Can I drop the indexes created earlier on those individual
fields and have mysql use the two indexes created by the create indexAB
command?


Depends what type of sorting you're planning on doing.
For instance, a query with ORDER BY B cannot use the compound index over
(A,B).

Regards,
Bill K.
Oct 7 '05 #2

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