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what is Constraint? How many types of constraints in SQL ?

Answer Posted / sivanagireddy.k

constraints nothing but condition on column in the table by using constraint checking process or validation pprocess has been done.

constraints are 6 tyes
1.unique
2.Not null
3.Primary key
4.Check
5.Default
6.Foreign key

types of level in constraints

column level
table level

send ur queries to this mail id rsivanagireddy@gmail.com

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