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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
different lock modes used in the locking system
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Left and Right Joins LEFT OUTER JOIN can be used when you want to retrieve the data from the main table (table1) even if there is no match in other tables (table_2, table_3...
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