adamc@1265: table t : { A : int, B : string }
adamc@1265: table u : { A : int, C : float }
adamc@1265: 
adamc@1265: val q : sql_query [] [T = [A = int, B = string], U = [C = option float]] [] =
adamc@1265:     (SELECT t.A, t.B, u.C
adamc@1265:      FROM {{sql_left_join (FROM t) (FROM u) (WHERE TRUE)}})