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Go Back  dBforums > Database Server Software > DB2 > Problem with Count Distinct using multiple columns

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  #1 (permalink)  
Old 03-28-09, 10:46
cprash.aggarwal cprash.aggarwal is offline
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Problem with Count Distinct using multiple columns
Hi,

I am succesful in doing below query and it returns me the count.

SELECT count(DISTINCT S_ITEMI|| S_IDCNG) FROM EREIMP.ODTEST AS ODTEST JOIN EREIMP.PLTEST AS PLTEST ON ODTEST.ITEM_OBJID = PLTEST.ITEM_OBJID WHERE ODTEST.Q_PMSYNC='Y' AND ODTEST.S_DC='RD' AND ODTEST.Q_DATEPMSYNC < ODTEST.Q_LASTMOD;

but when I am trying to do i m getting error
SELECT count(DISTINCT ODTEST.ITEM_OBJID||S_ITEMI|| S_IDCNG) FROM EREIMP.ODTEST AS ODTEST JOIN EREIMP.PLTEST AS PLTEST ON ODTEST.ITEM_OBJID = PLTEST.ITEM_OBJID WHERE ODTEST.Q_PMSYNC='Y' AND ODTEST.S_DC='RD' AND ODTEST.Q_DATEPMSYNC < ODTEST.Q_LASTMOD;

SQL0440N No authorized routine named "||" of type "FUNCTION" having
compatible arguments was found.
Any inputs how can i do it ?

Thanks
Prashant
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  #2 (permalink)  
Old 03-28-09, 11:13
nick.ncs nick.ncs is offline
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Quote:
SELECT count(DISTINCT (ODTEST.ITEM_OBJID||S_ITEMI|| S_IDCNG)) FROM EREIMP.ODTEST AS ODTEST JOIN EREIMP.PLTEST AS PLTEST ON ODTEST.ITEM_OBJID = PLTEST.ITEM_OBJID WHERE ODTEST.Q_PMSYNC='Y' AND ODTEST.S_DC='RD' AND ODTEST.Q_DATEPMSYNC < ODTEST.Q_LASTMOD;
Assuming the fact that ITEM_OBJID, S_ITEMI and S_IDCNG are all either VARCHAR or CHAR.... Else the same needs to be converted into one....
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  #3 (permalink)  
Old 03-28-09, 11:41
cprash.aggarwal cprash.aggarwal is offline
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Quote:
Originally Posted by nick.ncs
Assuming the fact that ITEM_OBJID, S_ITEMI and S_IDCNG are all either VARCHAR or CHAR.... Else the same needs to be converted into one....
S_ITEMI & S_IDCNG are character but ITEM_OBJID IS BIGINT. What to do now?
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Old 03-28-09, 16:51
Peter.Vanroose Peter.Vanroose is offline
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Quote:
Originally Posted by cprash.aggarwal
SELECT count(DISTINCT ODTEST.ITEM_OBJID||S_ITEMI|| S_IDCNG) FROM EREIMP.ODTEST AS ODTEST JOIN EREIMP.PLTEST AS PLTEST ON ODTEST.ITEM_OBJID = PLTEST.ITEM_OBJID WHERE ODTEST.Q_PMSYNC='Y' AND ODTEST.S_DC='RD' AND ODTEST.Q_DATEPMSYNC < ODTEST.Q_LASTMOD;

SQL0440N No authorized routine named "||" of type "FUNCTION" having
compatible arguments was found.
Try the following:
Code:
SELECT count(*) FROM
(SELECT DISTINCT O.ITEM_OBJID, S_ITEMI, S_IDCNG
 FROM EREIMP.ODTEST AS O
        INNER JOIN EREIMP.PLTEST AS P ON O.ITEM_OBJID = P.ITEM_OBJID
 WHERE O.Q_PMSYNC='Y' AND O.S_DC='RD' AND O.Q_DATEPMSYNC < O.Q_LASTMOD) X
This avoids a (potentially expensive) concat and type conversion.
And it's probably easier to read/understand.
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  #5 (permalink)  
Old 03-28-09, 23:36
cprash.aggarwal cprash.aggarwal is offline
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Quote:
Originally Posted by Peter.Vanroose
Try the following:
Code:
SELECT count(*) FROM
(SELECT DISTINCT O.ITEM_OBJID, S_ITEMI, S_IDCNG
 FROM EREIMP.ODTEST AS O
        INNER JOIN EREIMP.PLTEST AS P ON O.ITEM_OBJID = P.ITEM_OBJID
 WHERE O.Q_PMSYNC='Y' AND O.S_DC='RD' AND O.Q_DATEPMSYNC < O.Q_LASTMOD) X
This avoids a (potentially expensive) concat and type conversion.
And it's probably easier to read/understand.
This didn't work , but i tried this and it worked.

With test as ( SELECT DISTINCT ODTEST.ITEM_OBJID, S_ITEMI, S_IDCNG FROM EREIMP.ODTEST AS ODTEST JOIN EREIMP.PLTEST AS PLTEST ON ODTEST.ITEM_OBJID = PLTEST.ITEM_OBJID WHERE ODTEST.Q_PMSYNC='Y' AND ODTEST.S_DC='RD' AND ODTEST.Q_DATEPMSYNC < ODTEST.Q_LASTMOD) SELECT count(*) FROM test

Thanks
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  #6 (permalink)  
Old 03-28-09, 23:54
cprash.aggarwal cprash.aggarwal is offline
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Quote:
Originally Posted by cprash.aggarwal
This didn't work , but i tried this and it worked.

With test as ( SELECT DISTINCT ODTEST.ITEM_OBJID, S_ITEMI, S_IDCNG FROM EREIMP.ODTEST AS ODTEST JOIN EREIMP.PLTEST AS PLTEST ON ODTEST.ITEM_OBJID = PLTEST.ITEM_OBJID WHERE ODTEST.Q_PMSYNC='Y' AND ODTEST.S_DC='RD' AND ODTEST.Q_DATEPMSYNC < ODTEST.Q_LASTMOD) SELECT count(*) FROM test

Thanks
HI i wanted to use this in Stored procedure
but the following dowsnt work , cant we use temp tables in SP's?

With test as ( SELECT DISTINCT ODTEST.ITEM_OBJID, S_ITEMI, S_IDCNG FROM EREIMP.ODTEST AS ODTEST JOIN EREIMP.PLTEST AS PLTEST ON ODTEST.ITEM_OBJID = PLTEST.ITEM_OBJID WHERE ODTEST.Q_PMSYNC='Y' AND ODTEST.S_DC='RD' AND ODTEST.Q_DATEPMSYNC < ODTEST.Q_LASTMOD) SELECT count(*) INTO num_rows FROM test;
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  #7 (permalink)  
Old 03-29-09, 06:40
tonkuma tonkuma is offline
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Join Date: Feb 2008
Location: Japan
Posts: 2,193
You can not use Common Table Expression with SELECT INTO statement.
DB2 distinguishes SELECT statement and SELECT INTO statement.

I wondered why Peter Vanroose's query did not work.
Would you give me error messages which you got?
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