Between Dates SQL

Question

Hi,
Can anyone help, I need to generate a pivot table using between two dates and a department. I am trying to acheive the following output:
JAN-04 FEB-05 MAR-04 APR-04 MAY-04 JUN-04 JUL-04 AUG-04 SEP-04 OCT-04 etc
DEPT 1 1 1 1 1
CF
IF 1 1 1 1 1
The SQL is displayed as below:
"PERSON_ID" "EFFECTIVE_START_DATE"     "EFFECTIVE_END_DATE" "DEPT"
1182          12-JAN-04          07-MAY-04 CF
1182          17-JUN-04          31-DEC-12 IF
Can anyone help with acheiving the above pivot table based on the SQL results above
Thanks

Answer 1

Hi,
sliderrules wrote:
Hi,
Thanks for your help, just wanted to confirm should I be creating a lookup table called months containing the months to display in the pivot table. That depends on what you want to do. You can either have a real table, or you can generate a result set in a WITH clause, like I did. Either way, you have to have a table (or result set) that has one row for each column that you want in your pivoted output.
I have posted below some scripts to generate the table:
>
CREATE TABLE EMPLOYEES(
PERSON_ID NUMBER,
DEPT VARCHAR2(10),
EFFECTIVE_START_DATE DATE,
EFFECTIVE_END_DATE DATE);
INSERT INTO EMPLOYEES VALUES(1182, 'CF', '12-JAN-2004', '07-MAY-2004');
INSERT INTO EMPLOYEES VALUES(1182, 'IF', '12-JUN-2004', '07-DEC-2004');
INSERT INTO EMPLOYEES VALUES(1183, 'BF', '01-JAN-2005', '12-JUL-2005');Effective_start_date and effective_end_date are DATEs. Don't try to put VARCHAR2 values into DATE columns. Use TO_DATE to convert strings into DATEs.
>
I would like to acheive the following:
JAN04 FEB-04 MAR-04 APR-04 MAY-04 JUN-04 JUL-04 AUG-04 SEP-04 OCT-04 NOV-04 DEC-04 JAN-05 FEB-05 MAR-05 APR-05 JUN-05 JUL-05
DEPT
CF 1 1 1 1 1
IF 1 1 1 1 1 1 1
BF 1 1 1 1 1 1
Apologies if the pivot table is not readable, I am new to OTN and not sure how to format the output with tagsType these 6 characters:
\(small letters only, inside curly brackets) before and after each section of formatted text, to preserve spacing.
It would help a lot to know what you are trying to do.
Is the jan_04 month column supposed to show the number of rows in which the range effective_start_date to effective_end_date includes at least some part (if not all) of January, 2004?  If so, change the join conditions that I posted earlier:WITH     all_months     AS
     SELECT     LEVEL                              AS month_num
     ,     ADD_MONTHS (DATE '2004-01-01', LEVEL - 1)     AS month_begin_date
     ,     ADD_MONTHS (DATE '2004-01-01', LEVEL )     AS next_month_begin_date
     FROM     dual
     CONNECT BY     LEVEL <= 12     -- Or whatever value you want
SELECT     dept
,     COUNT     (CASE WHEN m.month_num = 1 THEN 1 END)     AS jan_04
,     COUNT     (CASE WHEN m.month_num = 2 THEN 1 END)     AS feb_04
,     COUNT     (CASE WHEN m.month_num = 3 THEN 1 END)     AS mar_04
FROM     all_months     m
JOIN     employees     e     ON     e.effective_start_date < m.next_month_begin_date
                    AND     e.effective_end_date >= m.month_begin_date
GROUP BY e.dept
ORDER BY e.dept