Smitha
New User
Joined: 20 Jun 2005
Posts: 5
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Hi,
During the execution of an SQL, if the WHERE clause contains any of the fields that is in the index, then it will use that particular index.
Suppose you have 2 indexes: X1: A,B
X2: Y,Z
Now your WHERE clause has the field B, then the first index will be used.
Indexes are used to improve the peformance of your query.
-Smitha. |
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