HardOutput prediction
Mixed set operators without parentheses
Given these tables:
a:
| v |
|---|
| 1 |
| 2 |
b:
| v |
|---|
| 2 |
| 3 |
c:
| v |
|---|
| 2 |
| 4 |
What does this query return?
SELECT v FROM a UNION SELECT v FROM b INTERSECT SELECT v FROM c;
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