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

val q1 = (SELECT * FROM t1)

table t2 : {A : float, D : int}

val q2 = (SELECT * FROM t1, t2)

(*val q3 = (SELECT * FROM t1, t1)*)
val q3 = (SELECT * FROM t1, t1 AS T2)

val q4 = (SELECT * FROM {t1} AS T, t1 AS T2)