Does compound index have direction in MySQL?

Posted by symfony on Stack Overflow See other posts from Stack Overflow or by symfony
Published on 2010-03-23T13:58:01Z Indexed on 2010/03/24 9:33 UTC
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When will the below be necessary:

create index i_t_a_b on t(a,b);

create index i_t_b_a on t(b,a);

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