What is difference between UNIQUE constraint and PRIMARY KEY constraint ?

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Hello guys,

What is difference between UNIQUE constraint and PRIMARY KEY constraint ?

Please give me your feedback...........

Thanks in advance

asked 1 year ago by daneim (127,080 points)

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Best answer

A column defined as UNIQUE can contain Nulls while a column defined as PRIMARY KEY can't contain Nulls.

answered 1 year ago by marck_don (191,010 points)

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asked 1 year ago by eagles11 (179,830 points)

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asked 1 year ago by WebMaster-Admin (36,670 points)

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asked 1 year ago by DBA-boss (120,990 points)

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asked 1 year ago by daneim (127,080 points)

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asked 1 year ago by rad_joshep (19,390 points)