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Month Order Amount
1 Item1 100
1 Item2 200
1 Item3 300
2 null null
3 Item4 100
4 null null
5 null null
6 Item1 100
Month Order Amount
1 Item1 100
1 Item2 200
1 Item3 300
2 Item1 100
2 Item2 200
2 Item3 300
3 Item4 100
4 Item4 100
5 Item4 100
6 Item1 100
Warning: Null value is eliminated by an aggregate or other SET operation.

Month prev
1 null
1 1
2 1
3 1
4 3
5 3
6 3
Warning: Null value is eliminated by an aggregate or other SET operation.