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6 rows affected
id blahblah userid value
1 blah-1 null null
2 null user-1 null
3 null null value-1
4 blah-2 null null
5 null user-2 null
6 null null value-3
rowno blahblah userid datavalue
1 blah-1 user-1 value-1
2 blah-2 user-2 value-3
Warning: Null value is eliminated by an aggregate or other SET operation.