SQL Help -- Need help with pivoting the columns to rows

Question

I have a requierement to split the columns into multiple rows. For example:
EMP_DEPT
rowid empid1 ename1 dept1 empid2 ename2 dep2 empid2 ename2      dep3 empid4 ename4 dept4
100001 1 'SCOTT' 10 2 'DAVE' 20 3 'MILLER'     10 4 SMITH 20
100002 1 'SCOTT' 10 2 'DAVE' 20 3 'MILLER'     20      
Note: EMP_DEPT may not always have all the 4 employee info populated for example in row 2 only 3 employees info is there
I need to convert it and insert into EMPLOYEE table as follows:
EMPLOYEE
empid ename dept
1 SCOTT 10
2 DAVE 20
3 MILLER 10
4 SMITH 20
1 SCOTT 10
2 DAVE 20
3 MILLER 20
Thanks
Kev

Answer 1

Frank Thank You for your response.
I am on oracle 10gR2.
Posting some sample DDL and data here as requested:
CREATE TABLE EMP
  PK          NUMBER(10),
  EMP_NAME1   VARCHAR2(100 BYTE),
  EMP_ID1     NUMBER(10),
  EMP_NAME2   VARCHAR2(100 BYTE),
  EMP_ID2     NUMBER(10),
  DEPT_NAME1  VARCHAR2(200 BYTE),
  DEPT_ID1    NUMBER(10),
  DEPT_NAME2  VARCHAR2(200 BYTE),
  DEPT_ID2    NUMBER(10)
CREATE TABLE EMP_DEPT
( PK NUMBER(10),
ENTY_TYPE VARCHAR2(100),
ENTY_NAME VARCHAR2(100),
ENTY_ID NUMBER(10)
Insert into EMP
   (PK, EMP_NAME1, EMP_ID1, EMP_NAME2, EMP_ID2, DEPT_NAME1, DEPT_ID1, DEPT_NAME2, DEPT_ID2)
Values
   (1, 'SCOTT', 10001, 'FRANK', 10002,
    'MARKETING', 10, 'ACCOUNTING', 20);
Insert into EMP
   (PK, EMP_NAME1, EMP_ID1, EMP_NAME2, EMP_ID2, DEPT_NAME1, DEPT_ID1)
Values
   (2, 'SCOTT1', 10003, 'FRANK1', 10004,
    'MARKETING1', 30);
COMMIT;
SELECT
FROM
EMP;
PK     EMP_NAME1     EMP_ID1     EMP_NAME2     EMP_ID2          DEPT_NAME1     DEPT_ID1     DEPT_NAME2     DEPT_ID2
1     SCOTT          10001     FRANK          10002          MARKETING     10          ACCOUNTING     20
2     SCOTT1          10003     FRANK1          10004          MARKETING1     30               My requirement is to:
SELECT from emp and INSERT INTO EMP_DEPT so that columns are broken into rows as follows
PK ENTY_TYPE, ENTY_NAME    ENTY_ID
1  EMPLOYEE   SCOTT        10001
2  EMPLOYEE   FRANK        10002
3  DEPARTMENT MARKETING    10
4  DEPARTMENT ACCOUNTING   20    
5  EMPLOYEE   SCOTT1       10003
6  EMPLOYEE   FRANK1       10004
7  DEPARTMENT MARKETING1   30          Thanks
Kevin
Edited by: user10210466 on Dec 8, 2010 1:37 PM