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Null Returns From DataBase

 
Sathya
Greenhorn
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I am having a Problem With JSQLConnect
If the DataBase Column in Null The JSQLCONNECT.jar trail Version is Not Giveing ANy error.
If i am Using Licensed Version It gives the Error.
The Query I have used is
Select Sum(A), sum(b), sum(c) from TabA Group By a,b,c
Sum(A) will return Null
Any Clue
 
It is sorta covered in the JavaRanch Style Guide.
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