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what is Constraint? How many types of constraints in SQL ?
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Answer Posted / yashwanth
constraints are the rules enforced on data columns on a
table
use:constraints are used to limit the type of data that
can go in to a table
there are some constraints
a primarykey constraint
a unquekey constraint
a foreinkey constraint
a check constraint
a not null constraint
a default constraint
| Is This Answer Correct ? | 47 Yes | 13 No |
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