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Example of Check Constraints
Example: Workaround for when subqueries not permitted in CHECK constraints
CREATE FUNCTION NO_MORE_THAN_20000_ENROLMENTS ( )
RETURNS BOOLEAN;
RETURN (SELECT COUNT (*) FROM IS_ENROLLED_ON) <= 20000;
ALTER TABLE IS_ENROLLED_ON
ADD CONSTRAINT MAX_ENROLMENTS
CHECK (NO_MORE_THAN_20000_ENROLMENTS ( ));
Write SQL queries to solve the following specifications. Include the query AND THE OUTPUT. A screen dump of the output is acceptable. Show as many rows as you can. A screen dump i
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What are the rates for help in writing PL/SQL procedures and functions?
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Create a Oracle procedure to produce vertical output format when selecting rows from a database table.
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