simple question about oracle indexes
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Published on 2010-06-03T05:18:53Z
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If I have an oracle query like below:
SELECT * FROM table_a where A = "1", B = "2", C = "3"
for this query to pickup one of the indexes of table_a...does the index need to be on all 3 of these columns?
What I am asking is:
What if Index is on A, B, C, D?
What if Index is on B, C?
Will the index only be picked when it is on A, B, C?
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