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

select S_Date, TID, sum(Value)
from SAM
group by S_Date, TID

Answer 2

If you really need this result set, with grouping only by T_ID, you can use this query:

SELECT   (SELECT top 1 S_Date FROM SAM as t1 WHERE t1.TID = t2.TID) as S_Date,
         TID,
         SUM(Value) 
FROM     SAM as t2
GROUP BY TID

Answer 3

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.

Answer 4

SELECT *, SUM(Value) AS Value From SAM GROUP BY TID

This will return the same table by summing up the Value column of the same TID column.