db2 - select rows with conditions in sql -


each concactentation of visid, custid , value might have both "detail" , "confirm" or "detail". if has "detail", rows should not retrieved, else have find difference between datetimes when combination of visid, custid , value have both "detail" , "confirm"

visid     custid    value     datetime                value1 123       456       11        2017-03-01 12:34:11     detail 123       456       11        2017-03-01 12:36:11     confirm 567       342       56        2017-03-01 12:45:11     detail 567       342       56        2017-03-01 12:46:11     confirm 411       124       78        2017-03-01 12:34:11     detail  output: visid     custid    value     datetime             123       456       11        00:02:00 (12:36:11 - 12:34:11) 567       342       56        00:01:00 (12:46:11 - 12:45:11)

note: since last row 411, 124 , 78 not have confirm, row has eliminated.

query tried:

  select visid, custid, value, concat(visid, custid, value) session, datetime   table1   datetime between "2017-05-01 00:00:00" , "2017-05-02 00:00:00"   , value1 in  ('detail','confirm')

datetime functions database specific. in case, self-join simple approach:

select td.visid, fd.custid, td.value, concat(visid, custid, value) session,        (tc.datetime - td.datetime) diff table1 td join      table1 tc      on td.visid = tc.visid ,  td.custid = tc.custid , td.value = tc.value ,         td.value1 = 'detail' , tc.value1 = 'confirm';

this uses subtraction difference. exact function depends on database.


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