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kriz_cts
New User
Joined: 03 Aug 2005
Posts: 23
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Hi folks,
What is a secondary key? How it is useful... |
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Karthikt
New User
Joined: 15 Aug 2005
Posts: 51
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Secondary key will be used as searck key and normally it returns too many rows.
e.g. If a database contains employee information where emp-id is primary key. then emp-name can be secondary which will be useful where one want to know the employee information starting with a particular name. It is useful in reducing the query time. |
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