SQL select values sum same ID

Question

This is my Table called "SAM"

ID  |   S_Date   |  S_MK |   TID   |   Value   |
===============================================
1   | 2012-12-11 |   1            


        

Answer 1

You have to use aggregate function "sum" for the sum of value column.

select S_Date ,TID, Sum(Value) from Sam group by S_Date, TID

Further more you should include all the column in group by clause that you used in select statement.