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What is the difference between Distinct and Unique?

Samanthi perera
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Joined: Jan 08, 2010
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What is the difference between Distinct and Unique?
Deepak Bala
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    5

In what context ?


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Peter Johnson
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    7

And for which database?


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Scott Selikoff
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Joined: Oct 23, 2005
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    5

If you are using it in projection to filter out duplicate results, then probably nothing. Some databases actually only support one of them (some support both), so this is more of a syntax issue than anything else.

Otherwise, UNIQUE can also be an attribute for a column making it a candidate/primary key, whereas DISTINCT is only used in SELECT statements.


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