NOT INSERTING

Question

SQL> SELECT * FROM EMP;
EMPNO ENAME JOB MGR SAL DEPTNO
7369 SMITH CLERK 7902 800 20
7499 ALLEN SALESMAN 7698 1600 30
7521 WARD SALESMAN 7698 1250 30
7566 JONES MANAGER 7839 2975 20
7654 MARTIN SALESMAN 7698 1250 30
7698 BLAKE MANAGER 7839 2850 30
7782 CLARK MANAGER 7839 2450 10
7788 SCOTT ANALYST 7566 3000 20
7839 KING PRESIDENT 5000 10
7844 TURNER SALESMAN 7698 1500 30
7876 ADAMS CLERK 7788 1100 20
7900 JAMES CLERK 7698 950 30
7902 FORD ANALYST 7566 3000 60
7934 MILLER CLERK 7782 1300 10
14 rows selected.
SQL> SELECT * FROM EMP1;
EMPNO ENAME JOB MGR SAL DEPTNO
7782 CLARK MANAGER 7839 2450 10
7839 KING PRESIDENT 5000 10
7934 MILLER CLERK 7782 1300 10
(RECORDS NOT IN TABLE 2)
SQL> select b.* from EMP b where not exists(select 1 from EMP1 a where b.DEPTNO=a.DEPTNO);
EMPNO ENAME JOB MGR SAL DEPTNO
7902 FORD ANALYST 7566 3000 60
7900 JAMES CLERK 7698 950 30
7844 TURNER SALESMAN 7698 1500 30
7698 BLAKE MANAGER 7839 2850 30
7654 MARTIN SALESMAN 7698 1250 30
7521 WARD SALESMAN 7698 1250 30
7499 ALLEN SALESMAN 7698 1600 30
7876 ADAMS CLERK 7788 1100 20
7788 SCOTT ANALYST 7566 3000 20
7566 JONES MANAGER 7839 2975 20
7369 SMITH CLERK 7902 800 20
11 rows selected.
(FOR INSERTING RECORDS IN TABLE 2 WHICH ARE PRESENT IN TABLE 1 AND NOT THERE IN TABALE2)
SQL> begin
2 for i in(select b.* from EMP b where not exists(select 1 from EMP1 a where b.DEPTNO=a.DEPTNO))
3 LOOP
4 if(I.MGR = NULL) then
5 insert into EMP1 values(I.EMPNO,I.ENAME,I.JOB,I.MGR,I.SAL,I.DEPTNO);
6 elsif (i.MGR != NULL) then
7 insert into EMP1 values(I.EMPNO,I.ENAME,I.JOB,I.MGR,NULL,I.DEPTNO);
8 end if;
9 COMMIT;
10 end loop;
11 end;
12 /
PL/SQL procedure successfully completed.
(NOT INSERTED)
SQL> SELECT * FROM EMP1;
EMPNO ENAME JOB MGR SAL DEPTNO
7782 CLARK MANAGER 7839 2450 10
7839 KING PRESIDENT 5000 10
7934 MILLER CLERK 7782 1300 10
SQL>

Answer 1

Please also note on nulls =>
select *
from emp
where manager != 'MILLER'
Would NOT give you anyone if no manager.
You can use nvl(manager,'NO MANAGER') != 'MILLER' to rectify this....
regards,
Robert.
Edited by: BluShadow on 05-Jan-2012 09:18
edited to substitute <> for != as the forum doesn't show <> unless html versions are used.