table t1 : {A : int, B : string, C : float}
table t2 : {A : float, D : int}

val q1 = (SELECT * FROM t1 ORDER BY t1.A, t1.B)
val q2 = (SELECT * FROM t1 GROUP BY t1.A ORDER BY t1.A, t1.B)
val q3 = (SELECT t1.B FROM t1
        UNION SELECT t1.B FROM t1
        ORDER BY t1.B)