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what is Constraint? How many types of constraints in SQL ?
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Answer Posted / shelly
Constraints are used to limit the type of data that goes
into a table.Constraints can be declared at the time of
creating a table or by altering the already created table.
1)Not Null
2)Unique
3)Primary Key
4)Check
5)References
6)Default
| Is This Answer Correct ? | 2 Yes | 0 No |
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