What Is The Use Of Unique Keyword And What Level It Is Defined?

1.	What Is The Use Of Unique Keyword And What Level It Is Defined?
Answer» It will AVOID to enter DUPLICATE KEY VALUES. We have to DEFINE it in a file level. It will avoid to enter duplicate key values. We have to define it in a file level.

Answer»

It will AVOID to enter DUPLICATE KEY VALUES. We have to DEFINE it in a file level.

It will avoid to enter duplicate key values. We have to define it in a file level.

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