SQL help - Need help to rotate the columns to rows
I have a HughesNet to divide the columns into multiple lines. For example:EMP_DEPT
ROWID empid1 ename1 empid2 ename2 empid2 ename2 empid4 ename4 dept4 dep3 dep2 dept1
100001 1 'SCOTT' 10 2 'DAVE' 20 3 10 4 20 SMITH "MILLER"
100002 1 'SCOTT' 10 2 'DAVE' 20 3 'MILLER' 20
Note: EMP_DEPT do not always have information about the 4 employees settled for example in info only 3 employees rank 2 are there
I need to convert and insert it into the EMPLOYEE table as follows:
EMPLOYEE
EmpID ename dept
1 SCOTT 10
2 20 DAVE
3 MILLER 10
4 SMITH 20
1 SCOTT 10
2 20 DAVE
3 MILLER 20
Thank you
KeV
Hey Kevin,
Here's one way:
WITH t AS (
SELECT level i FROM dual CONNECT BY level <= 4
)
SELECT enty_type, enty_name, enty_id
FROM (
SELECT case when mod(t.i,2) = 0 then 'DEPARTMENT'
else 'EMPLOYEE'
end as enty_type
, case t.i
when 1 then emp_name1
when 2 then dept_name1
when 3 then emp_name2
when 4 then dept_name2
end as enty_name
, case t.i
when 1 then emp_id1
when 2 then dept_id1
when 3 then emp_id2
when 4 then dept_id2
end as enty_id
FROM emp
CROSS JOIN t
)
WHERE enty_id IS NOT NULL
;
Another using the MODEL clause:
SELECT *
FROM (
SELECT enty_id, enty_name, enty_type
FROM emp
MODEL
RETURN UPDATED ROWS
PARTITION BY (pk)
DIMENSION BY (0 i)
MEASURES(
emp_id1, emp_name1
, emp_id2, emp_name2
, dept_id1, dept_name1
, dept_id2, dept_name2
, cast(null as number(10)) enty_id
, cast(null as varchar2(200)) enty_name
, cast(null as varchar2(30)) enty_type
)
RULES (
enty_type[1] = 'EMPLOYEE' , enty_id[1] = emp_id1[0], enty_name[1] = emp_name1[0]
, enty_type[2] = 'EMPLOYEE' , enty_id[2] = emp_id2[0], enty_name[2] = emp_name2[0]
, enty_type[3] = 'DEPARTMENT' , enty_id[3] = dept_id1[0], enty_name[3] = dept_name1[0]
, enty_type[4] = 'DEPARTMENT' , enty_id[4] = dept_id2[0], enty_name[4] = dept_name2[0]
)
)
WHERE enty_id IS NOT NULL
;
Published by: odie_63 on 8 Dec. 2010 21:00
Tags: Database
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