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what is Constraint? How many types of constraints in SQL ?
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Answer Posted / seshu
constraint is a mechanism it is used to prevent the invalid
data entry in to the table is called constraint.
constraints are 5 types they are,
1 Primary Key Constraint
2 Foreign Key Constraint
3 Unique Constraint
4 Not Null Constraint
5 Check Constraint
| Is This Answer Correct ? | 5 Yes | 1 No |
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