Mercurial > urweb
view tests/group_by.ur @ 646:fb2a0e76dcef
ListEdit demo, minus prose
author | Adam Chlipala <adamc@hcoop.net> |
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date | Tue, 10 Mar 2009 12:44:40 -0400 (2009-03-10) |
parents | d1b679dbbc25 |
children |
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table t1 : {A : int, B : string, C : float} table t2 : {A : float, D : int} val q1 = (SELECT * FROM t1 GROUP BY t1.B) val q2 = (SELECT * FROM t1, t2 GROUP BY t1.B, t2.D, t1.A) val q3 = (SELECT * FROM t1 WHERE t1.A = 0 GROUP BY t1.B) val q4 = (SELECT * FROM t1 WHERE t1.A = 0 GROUP BY t1.B HAVING t1.B <> 'Bad') val q5 = (SELECT t1.A, t2.D FROM t1, t2 GROUP BY t2.D, t1.A) val q6 = (SELECT t1.A, t2.D FROM t1, t2 WHERE t1.C = 0.0 GROUP BY t2.D, t1.A HAVING t1.A = t1.A AND t2.D = 17) datatype list a = Nil | Cons of a * list a val r1 : transaction (list {B : string}) = query q4 (fn fs acc => return (Cons (fs.T1, acc))) Nil val r2 : transaction string = ls <- r1; return (case ls of Nil => "Problem" | Cons ({B = b, ...}, _) => b) val main : unit -> transaction page = fn () => s <- r2; return <html><body> {cdata s} </body></html>