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what is primary key,unique key, foreign key? can u teach me
in simple language?
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Answer Posted / nitin kumar
A primary key is one which uniquely identifies a row of a
table. This key does not allow null values and duplicate
values.
A foreign key is one which identifies a set of columns in a
table or enforce link between the in two tables.
| Is This Answer Correct ? | 2 Yes | 1 No |
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