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Subprograms
The PL/SQL has two types of subprograms known as the procedures and functions that can take parameters and be invoked. As the following example represents, a subprogram is like a miniature program, start with a header followed by an optional declarative part, an executable part, and an optional exception-handling part:
PROCEDURE award_bonus (emp_id NUMBER) IS
bonus REAL;
comm_missing EXCEPTION;
BEGIN
SELECT comm * 0.15 INTO bonus FROM emp WHERE empno = emp_id;
IF bonus IS NULL THEN
RAISE comm_missing;
ELSE
UPDATE payroll SET pay = pay + bonus WHERE empno = emp_id;
END IF;
EXCEPTION
WHEN comm_missing THEN
...
END award_bonus;
If called, this procedure accepts an employee number. And it uses the number to select the employee's payment from a database table and, at the similar time, calculate a 15% bonus. Now, it checks the bonus amount. If the bonus is zero or null, an exception is raised; or else, the employee's payroll record is updated.
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