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what is the difference between primary key & foreign key?
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Answer Posted / afzaal
primary key is a constraint key that can not contain a null
or duplicate values.
foriegn key is a reference key ,before referencing the
foriegn key parent table field or fields must have primary
key.If u can try to insert a value in referencing field,new
record that must contain parent field.
| Is This Answer Correct ? | 22 Yes | 11 No |
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