Example: -Show the employees whose job title is the similar as that of employee 7566 and salary is extra than the salary of employee 7788.

Let consider the given partial relation EMP. Let us make some sub-queries for them

SELECT ENAME, JOB

FROM EMP

WHERE JOB =   (SELECT JOB  

                            FROM EMP

                            WHERE EMPPNO = 7566)

                 AND SAL > (SELECT SAL

                                       FROM EMP

                                       WHERE EMPPNO=7788);

Output: Job title for the employee 7566 occurs to be 'MANAGER')