adamc@904: fun filter [fs ::: {Type}] [ks] (t : sql_table fs ks) (p : sql_exp [T = fs] [] [] bool)
adamc@904:    : sql_query [T = fs] [] =
adamc@904:    (SELECT * FROM t WHERE {p})
adamc@904: 
adamc@904: table t : { A : int, B : float }
adamc@904: 
adamc@904: fun main () =
adamc@904:     queryX (filter t (WHERE t.A > 3))
adamc@904:            (fn r => <xml>{[r.T.A]}, {[r.T.B]}</xml>)