SQL query to group data by Code and dates

Question

Hi There,
I have the following table structure
col1 col2 col3
code1 21-jan-2012 tested
code1 20-jan-2012 tested
code1 01-jun-2012 tested
code2 01-jun-2012 tested
code3 04-jun-2012 tested
so on
The output should be some thing like
code Week1 week2 week 3 week4 week5 till about last 14 weeks from the date we are running
code1 1 0 0 0 0
code2 1 0 0 0 0
code 3 0 1 0 0 0
where 1, 0 is actually the counts and not sum and the week in this case, should have maybe been since we are in the second week it should have been
code .....................week3 may week4 may week1 jun week2june
Was looking for suggestions on how to get this done.
I am assuming this would require some sort of a pivot query?
Thanks,
Sun

Answer 1

Hi, Sun,
sun1977 wrote:
Thanks EKH,
Yes, in lines of the output of this query. Is it possible to,
1. In the query, if condition is met, the it simply displays 1 else 0. Basically, we need to get the count of the number of the codes in that week. So if code 1 happened 5 times, it should show 5.Sure; use COUNT instead of MAX.
2. Provide the output between two dates. Lets say, I have to do it for the last 14 weeks from sysdate. Then will the logic of week1 = 1 work?Use date arithmetic to get the number of days between the starting date and col2, then divide by 7 to get the number of weeks. Use that number instead of the value returned by TO_CHAR.
3. any suggestions if the counts have to be changed to percentages. How can we have the percentage value showingYou can do that. Exactly how depends on exactly what you want. It may involve using the analytic RATIO_TO_REPORT function in a sub-query. Post the exact results you want from the sample data that Ekh posted (or new sample data that you post), and explain how you get those results from that data.
4. Would we also be able to add a date bind value. Lets say, if the user selects start date as may, 1st, 2012 and end date as jun5th. It sort of shows the same data but in weekly format for the weeks between the period selected?Sure, just use those values in a WHERE clause. The output needs to have a fixed number of columns, however. Say that number is 14. You can give a range that only covers 5 weeks, but the output will have 9 0's at the end of every row. You can give a range that covers 15 or more weeks, but the weeks after 14 will not be shown. To get around that requires dynamic SQL (if you want each week in a real column) or string aggregation. See {message:id=3527823}
Point 3 is different from point 1 as in, the first one would be maybe using your logic but hardcoding for 14 weeks. Point three would be a little more dynamic.
Thanks for your time.
Sun
Edited by: sun1977 on Jun 7, 2012 2:28 AM
EXEC  :start_dt_txt := '01-May-2012';
EXEC  :end_dt_txt   := '05-Jun-2012';
WITH  got_week_num  AS
     SELECT  col1, col2
     ,     1 + FLOOR ( (col2 - TO_DATE (:start_dt_txt, 'DD-Mon-YYYY'))
                     / 7
                 )     AS week_num
     FROM    t
     WHERE     col2     >= TO_DATE (:start_dt_txt, ':DD-Mon-YYYY')
     AND     col2     <  TO_DATE (:end_dt_txt,   ':DD-Mon-YYYY') + 1
SELECT       col1
,       COUNT (CASE WHEN week_num =  1 THEN 1 END)     AS week_1
,       COUNT (CASE WHEN week_num =  2 THEN 1 END)     AS week_2
,       COUNT (CASE WHEN week_num =  3 THEN 1 END)     AS week_3
,       COUNT (CASE WHEN week_num =  4 THEN 1 END)     AS week_4
,       COUNT (CASE WHEN week_num =  5 THEN 1 END)     AS week_5
,       COUNT (CASE WHEN week_num =  6 THEN 1 END)     AS week_6
,       COUNT (CASE WHEN week_num = 14 THEN 1 END)     AS week_14
FROM       got_week_num
GROUP BY  col1
ORDER BY  col1
;Edited by: Frank Kulash on Jun 7, 2012 5:53 AM