I have a general question that appears to have the answer of "keep the SELECT WHERE statement in the same pattern as your index." Any comments on the validity of this statement. Please comment.

Example:
If my index on a table is A + B
(two chacter based fields to keep things simple) and I then have

SELECT statement with WHERE B = vp_B AND A = vp_A

will this run at the same speed as the same as

SELECT statement but with WHERE A = vp_A AND B = vp_B

Thanks
Jon