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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
Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
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aggregation
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