1 PASSTHRU
2 Expression
2.1? TO DatabaseReference
2.2? VALUES (
2.2.1+ ,
2.2.1 Expression
2.2.2 )
2  (1)  ( Expression
2.1? ,
2.1.1+ ,
2.1.1 Expression
2.1.2 )

WHERE

1 DatabaseReference =   Database . DataSourceClause