Logical operators-logical operators, Database Management System

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Logical Operators

Rules of Precedence:

Order evaluated	Operator
1	All comparison operators

2	NOT
3	AND
4	OR

Example: To produce those records of salesman or president who are having salary above 15000/-

Select ename, job, sal from emp

Where job = 'SALESMAN' or job = 'PRESIDENT'

And sal>15000;

The query formulation as above is wrong for the problem statement. The correct formulation would be:

SELECT ENAME, JOB, SAL FROM EMP

WHERE (JOB = 'SALESMAN' OR JOB = 'PRESIDENT') AND SAL>15000;

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