1? THE
2 (
3 SELECT
4 %SelectClause
5 FROM
6+ ,
6 Source
6.1? AS Alias
3? WHERE Condition
4 )

SelectClause

1+ <<---- ,------ <<
1 Expression
1.1? AS Target
1 ITEM Expression
1 COUNT
1 MAX
1 MIN
1 SUM
1.1 ( Expression )