Master detail relation in the sql report

Question

HI All
I am using Oracle 10g and have a requirement where I need to generate the output in the following format
Deptno 10
Empno Ename
1 ----------A
2 ----------B
Deptno 20
Empno Ename
3-----------C
4-----------D
5-----------E
Deptno 30
Empno Ename
6-----------F
7-----------G
Can we do it throgh sql report in sqlplus.
Thanks
Edited by: user602329 on Sep 15, 2010 10:18 PM

Answer 1

Hi,
In pure SQL, you can get results like that using GROUP BY ROLLUP, and also using UNION. In this case, I suspect UNION would be a lot simpler.
Using SQL*Plus fucntionality, you could also write a SQL-from-SQL script that writes (and runs) a separate query for each department, the output of which is exactly what you requested.
I'd try UNION first.
Write one query to get the rows like
Deptno 10from your table, using GROUP BY deptno.
Write another query to get the rows like:
Empno Enamefrom your table, using GROUP BY deptno to get one such row per department. (It's possible to combine these two queries, but simpler not to.)
Write another query to get the actual data, such as
EMPNO  ENAME
=====  =====
1      A
2      B
3      C
4      D
5      E
6      F
7      GThen do a UNION of all three queries, with an ORDER BY clause to get them in the right order.
Each branch of the UNION will need some extra columns, to make the sorting work right. That is, the result set of the UNION will look something like this:
OUT1   OUT2        EMPNO     DEPTNO     QUERYNO
Deptno 10               10     1          
Deptno 20                   20     1
Deptno 30                   30     1
EMPNO  ENAME               10     2
EMPNO  ENAME               10     2
EMPNO  ENAME               10     2
1      A        1          10     3
2      B        2          10     3
3      C        3          10     3
4      D        4          10     3
5      E        5          10     3
6      F        6          10     3
7      G        7          10     3If you're going to have text, like 'EMPNO' in the 1st column, but empno is a NUMBER, then you should convert the NUMBERs to VARCAHR2s, using TO_CHAR.
You probably won't want to display those extra columns, so use the SQL*Plus "COLUMN ... NOPRINT" command to hide them, or do the UNION in a sub-query, and then do the ORDER BY in a super-query, where you can use columns in the ORDER BY clause without putting them in the SELECT clause alsio.
Edited by: Frank Kulash on Sep 16, 2010 11:02 AM