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Define Assertions in SQL

a. An assertion is a predicate that is expressing a condition we wish the database to always satisfy.

b. Domain constraints, functional dependency and referential integrity are unique forms of assertion.

c. In which a constraint cannot be expressed in these forms, we use an assertion, for example

Making sure the sum of loan amounts for each branch is less than the sum of all account balances at the branch.
Making sure every loan customer keeps a minimum of $1000 in an account.

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DBMS, Programming

Category:- DBMS
Reference No.:- M9543197

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