I want to search job and salary from employee table but I am getting error like invalid relational operator [closed]

Actual code depends on tool you use. In SQL*Plus, it is the &; in SQL Developer or TOAD, that would be a :. Also, GUI tools usually don’t require enclosing string parameters into single quotes.

Here’s a SQL*Plus example:

SQL> select * from emp where job = '&job' and sal <= &sal;
Enter value for job: CLERK
Enter value for sal: 1000
old   1: select * from emp where job = '&job' and sal <= &sal
new   1: select * from emp where job = 'CLERK' and sal <= 1000

     EMPNO ENAME      JOB              MGR HIREDATE        SAL       COMM     DEPTNO
---------- ---------- --------- ---------- -------- ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17.12.80        800        300         20
      7900 JAMES      CLERK           7698 03.12.81        950                    30

SQL>

Or, a prettier way would be to use ACCEPT SQL*Plus command:

SQL> accept par_job prompt 'Enter job '
Enter job CLERK
SQL> accept par_sal prompt 'Enter salary '
Enter salary 1000
SQL> select * from emp where job = '&par_job' and sal <= &par_sal;
old   1: select * from emp where job = '&par_job' and sal <= &par_sal
new   1: select * from emp where job = 'CLERK' and sal <= 1000

     EMPNO ENAME      JOB              MGR HIREDATE        SAL       COMM     DEPTNO
---------- ---------- --------- ---------- -------- ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17.12.80        800        300         20
      7900 JAMES      CLERK           7698 03.12.81        950                    30

SQL>

SQL Developer would accept the same code as above, or – alternatively –

select * from emp where job = :job and sal <= :sal;