Any other way to write this using nvl(x,v) locator.

Question

please solve my confusion.
select * from emp
where nvl(to_char(temperature),'a')
in (select nvl(to_char(temperature),'a') from emp
where ename = 'SCOTT');
temperature column in numeric value. Is there anyother way to execute the same answer without using type casting(to_char).
can we use above queries ans without to_char..
Edited by: user8710598 on Aug 19, 2009 10:18 AM

Answer 1

Hi Solomon,
I think you are forgot one case ( if sal is null).
Sincerly it's good solution Solomon, I learned a good method to avoid scan table two times.
Tanks Solomon.
Good job.
SELECT *
  FROM (SELECT e.*,
               MAX (CASE
                       WHEN ename = 'SCOTT' OR temperature IS NULL
                          THEN 1
                    END
                   ) OVER (PARTITION BY temperature) scotts_temperature_club
          FROM emp e)
WHERE scotts_temperature_club = 1
SELECT *
  FROM emp_test;
     EMPNO ENAME      JOB              MGR HIREDATE          SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 1980-12-17        800                    20
      7499 ALLEN      SALESMAN        7698 1981-02-20       1600        300         30
      7521 WARD       SALESMAN        7698 1981-02-22       3000        500         30
      7566 JONES      MANAGER         7839 1981-04-02                               20
      7654 MARTIN     SALESMAN        7698 1981-09-28       1250       1400         30
      7698 BLAKE      MANAGER         7839 1981-05-01                               30
      7782 CLARK      MANAGER         7839 1981-06-09       2450                    10
      7788 SCOTT      ANALYST         7566 1987-04-19       3000                    20
      7839 KING       PRESIDENT            1981-11-17       5000          0         10
      7844 TURNER     SALESMAN        7698 1981-09-08       1500                    30
      7876 ADAMS      CLERK           7788 1987-05-23                               20
      7900 JAMES      CLERK           7698 1981-12-03        950                    30
      7902 FORD       ANALYST         7566 1981-12-03       3000                    20
      7934 MILLER     CLERK           7782 1982-01-23       1300                    10
SELECT *
  FROM (SELECT e.*,
               MAX (CASE
                       WHEN ename = 'SCOTT' OR sal IS NULL
                          THEN 1
                    END
                   ) OVER (PARTITION BY sal) scotts_salary_club
          FROM emp_test e)
WHERE scotts_salary_club = 1
     EMPNO ENAME      JOB              MGR HIREDATE          SAL       COMM     DEPTNO SCOTTS_SALARY_CLUB
      7788 SCOTT      ANALYST         7566 1987-04-19       3000                    20                  1
      7521 WARD       SALESMAN        7698 1981-02-22       3000        500         30                  1
      7902 FORD       ANALYST         7566 1981-12-03       3000                    20                  1
      7566 JONES      MANAGER         7839 1981-04-02                               20                  1
      7876 ADAMS      CLERK           7788 1987-05-23                               20                  1
      7698 BLAKE      MANAGER         7839 1981-05-01                               30                  1
6 rows selected.