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Example of ADD CONSTRAINT in SQL
Example: Alternative formulation for MAX_ENROLMENTS
ALTER TABLE IS_ENROLLED_ON
ADD CONSTRAINT MAX_ENROLMENTS
CHECK ((SELECT COUNT (*) FROM IS_ENROLLED_ON) <= 20000);
Explanation
Defining and Declaring Collections To create the collections, you must define a collection type, and then declare the collections of that type. You can define the VARRAY types a
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