I have tree tables
ID A
-----------
1 10
ID B
-----------
1 20
2 30
ID C
-----------
2 40
3 50
Can anybody please tell how to make a view or query prints like this?
ID A B C R (A + B - C)
-----------------------------------
1 10 20 0 30
2 0 30 40 -10
3 0 0 50 -50
Thanks in advance.
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