1 subselect
1 (fullselect)
1 %values-clause
2+ 
2? 
2.0 UNION
2.0.1! DISTINCT
2.0.1?
2.0.1 ALL
2.0 EXCEPT
2.0.1! DISTINCT
2.0 INTERSECT
2.0.1! DISTINCT
2.1 subselect
2.1 (fullselect)
2.1 %values-clause
3? 
3 order-by-clause
4? 
4 fetch-first-clause

values-clause

1 VALUES
2+ ,
2 %values-row

values-row

1.0 expression
1.0 NULL
1 (
1.1+ ,
1.1 expression
1.1 NULL
1.2 )