What are constraints? Explain different types of
constraints?
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Answer Posted / taru mathur
a constraint refers to a condition or a check that is
applied to a coloumn(field)or a set of coloumns in a table.
Their are mainly five types of constarints:
1. UNIQUE CONSTRAINT
2. PRIMARY KEY CONSTRAINT
3. DEFAULT CONSTRAINT
4. CHECK CONSTRAINT
5. FOREIGN KEY CONSTRAINT
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