I have the query below where the date is hard-coded. My objective is to remove the harcoded date; the query should pull the data for the previous month when it runs.
select count(distinct switch_id) from xx_new.xx_cti_call_details@appsread.prd.com where dealer_name = 'XXXX' and TRUNC(CREATION_DATE) BETWEEN '01-AUG-2012' AND '31-AUG-2012' Should I use sysdate-15 function for that?
Modifying Ben's query little bit,
select count(distinct switch_id) from xx_new.xx_cti_call_details@appsread.prd.com where dealer_name = 'XXXX' and creation_date between add_months(trunc(sysdate,'mm'),-1) and last_day(add_months(trunc(sysdate,'mm'),-1)) The trunc() function truncates a date to the specified time period; so trunc(sysdate,'mm') would return the beginning of the current month. You can then use the add_months() function to get the beginning of the previous month, something like this:
select count(distinct switch_id) from xx_new.xx_cti_call_details@appsread.prd.com where dealer_name = 'XXXX' and creation_date >= add_months(trunc(sysdate,'mm'),-1) and creation_date < trunc(sysdate, 'mm') As a little side not you're not explicitly converting to a date in your original query. Always do this, either using a date literal, e.g. DATE 2012-08-31, or the to_date() function, for example to_date('2012-08-31','YYYY-MM-DD'). If you don't then you are bound to get this wrong at some point.
You would not use sysdate - 15 as this would provide the date 15 days before the current date, which does not seem to be what you are after. It would also include a time component as you are not using trunc().
Just as a little demonstration of what trunc(<date>,'mm') does:
select sysdate , case when trunc(sysdate,'mm') > to_date('20120901 00:00:00','yyyymmdd hh24:mi:ss') then 1 end as gt , case when trunc(sysdate,'mm') < to_date('20120901 00:00:00','yyyymmdd hh24:mi:ss') then 1 end as lt , case when trunc(sysdate,'mm') = to_date('20120901 00:00:00','yyyymmdd hh24:mi:ss') then 1 end as eq from dual ; SYSDATE GT LT EQ ----------------- ---------- ---------- ---------- 20120911 19:58:51 1 Data for last month-
select count(distinct switch_id) from xx_new.xx_cti_call_details@appsread.prd.com where dealer_name = 'XXXX' and to_char(CREATION_DATE,'MMYYYY') = to_char(add_months(trunc(sysdate),-1),'MMYYYY'); Getting last nth months data retrieve
SELECT * FROM TABLE_NAME WHERE DATE_COLUMN BETWEEN '&STARTDATE' AND '&ENDDATE'; I believe this would also work:
select count(distinct switch_id) from xx_new.xx_cti_call_details@appsread.prd.com where dealer_name = 'XXXX' and (creation_date BETWEEN add_months(trunc(sysdate,'mm'),-1) and trunc(sysdate, 'mm')) It has the advantage of using BETWEEN which is the way the OP used his date selection criteria.