### view tests/group_by.ur @ 1714:d6c45026240d

Do a lot more type simplification for error messages
author Adam Chlipala Mon, 16 Apr 2012 09:46:42 -0400 d1b679dbbc25
line wrap: on
line source
```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>```