How To Write A Matrix Query in Oracle 10g

Question

Hi All,
I need to write a query displaying total of each Month and each quarter total. Here is example:
CREATE TABLE T_CUST_REG(
CUST_ID NUMBER,
CUST_NAME VARCHAR2(255),
REGDATE  DATE);
INSERT INTO T_CUST_REG VALUES (1, 'A','01-JAN-2012');
INSERT INTO T_CUST_REG VALUES (2, 'B','01-FEB-2012');
INSERT INTO T_CUST_REG VALUES (3, 'C','01-MAR-2012');
INSERT INTO T_CUST_REG VALUES (4, 'D','01-APR-2012');
INSERT INTO T_CUST_REG VALUES (5, 'E','01-MAY-2012');
INSERT INTO T_CUST_REG VALUES (6, 'F','01-JUN-2012');
INSERT INTO T_CUST_REG VALUES (7, 'G','01-JUL-2012');
INSERT INTO T_CUST_REG VALUES (8, 'H','01-AUG-2012');
INSERT INTO T_CUST_REG VALUES (9, 'I','01-SEP-2012');
INSERT INTO T_CUST_REG VALUES (10, 'J','01-OCT-2012');
INSERT INTO T_CUST_REG VALUES (11, 'K','01-NOV-2012');
INSERT INTO T_CUST_REG VALUES (12, 'L','01-DEC-2012');
Output REQUIRED:
JAN
FEB
MAR
Q1
APR
MAY
JUN
Q2
JUL
AUG
SEP
Q3
OCT
NOV
DEC
Q4
1
1
1
3
1
1
1
3
1
1
1
3
1
1
1
3
I am able to create matrix with following query, but issue is how to put Quarter(total) in between.
Select Count(1), TO_CHAR(REGDATE, 'MON') MON 
FROM T_CUST_REG T
GROUP BY TO_CHAR(REGDATE, 'MON');
Regards

Answer 1

Hi,
The query you posted will produce a separate row for each month, not a separate column.  Is that what you want?
If so, you can add the quarterly totals with GROUPING SETS, like this:
SELECT    COUNT (*)    AS cnt
,         CASE
              WHEN  GROUPING (TRUNC (regdate, 'MONTH')) = 0
              THEN  TO_CHAR (TRUNC (regdate, 'MONTH'), 'YYYY MON')
              ELSE  TO_CHAR (TRUNC (regdate, 'Q'),     'YYYY "Q"Q')
          END          AS label
FROM      t_cust_reg
GROUP BY  GROUPING SETS ( (TRUNC (regdate, 'MONTH'))
                        , (TRUNC (regdate, 'Q'))
Instead of calling TRUNC over and over, you might want to do it just 2 times, in a sub-query, giving aliases to the results, and then use the aliases over and over in the main query.
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only), and the exact results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say what version of Oracle you're using (e.g. 11.2.0.2.0).
See the forum FAQ: https://forums.oracle.com/message/9362002