How to add sequence number in inner querry

Question

Hi friends,
I have a problem regarding SQL code.
Suppose that the queery is like this
SELECT a.*,
     b.*,
FROM
     (SELECT 'ename'
     FROM dual) a,
     (SELECT ename --hear in this querry I am getting two rows , so I want to identify those two rows by a sequence number(sequence no is must to me)
     FROM emp
     WHERE sal < 1000) b     -- In emp table only two employes are there with sal<1000
Please help me any one....

Answer 1

You don't need a subquery.
SQL> SELECT * FROM EMP;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 23-MAY-87       1100                    20
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
      4568 salim
15 rows selected.
SQL> SELECT 'ENAME'COLA,EMPNO,SEQ_SA.NEXTVAL RE_NO
  2  FROM EMP
  3  WHERE SAL<5000;
COLA       EMPNO      RE_NO
ENAME       7369          1
ENAME       7499          2
ENAME       7521          3
ENAME       7566          4
ENAME       7654          5
ENAME       7698          6
ENAME       7782          7
ENAME       7788          8
ENAME       7844          9
ENAME       7876         10
ENAME       7900         11
COLA       EMPNO      RE_NO
ENAME       7902         12
ENAME       7934         13
13 rows selected.
SQL> SELECT 'ENAME'COLA,EMPNO,SEQ_SA.NEXTVAL RE_NO
  2  FROM EMP
  3  WHERE SAL<1000;
COLA       EMPNO      RE_NO
ENAME       7369         14
ENAME       7900         15
SQL>