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loop through data suming up a field

Posted on 2014-04-15
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Last Modified: 2014-04-15
DRUG_CODE      ChrgUnits        Pat_Num_CSN
3074              1                111111111
3074             -1                111111111
3000             -1                111111111
3000               1                111111111
3000              1                111111111

above data represents what I have, all stored as text. I'd like to loop through the data adding up the ChrgUnits based/grouped on the drug code and pat num csn and come up with this (in this example)

DRUG_CODE      ChrgUnits        Pat_Num_CSN
3074              0                111111111
3000              1                111111111
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Question by:ghettocounselor
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Missus Miss_Sellaneus earned 500 total points
ID: 40002491
Select DRUG_CODE, SUM(CAST(ChrgUnits AS int)) as Sum_ChrgUnits, Pat_Num_CSN from tablename GROUP BY DRUG_CODE, Pat_Num_CSN ORDER BY 1,3;
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by:ghettocounselor
ID: 40002538
appreciate the rapid response!
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