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|
table t1 : {A : int, B : string, C : float}
table t2 : {A : float, D : int}
val q1 = (SELECT * FROM t1
UNION SELECT * FROM t1)
val q2 = (SELECT t1.A, t1.B FROM t1 WHERE t1.A = 0
INTERSECT SELECT t1.B, t1.A FROM t1 WHERE t1.B = t1.B)
val q3 = (SELECT t1.A, t1.B, t1.C FROM t1 WHERE t1.A = 0
INTERSECT SELECT * FROM t1 WHERE t1.B = 'Hello world!'
EXCEPT SELECT * FROM t1 WHERE t1.A < t1.A
UNION SELECT * FROM t1 WHERE t1.A > t1.A)
datatype list a = Nil | Cons of a * list a
val r1 : transaction (list {A : int, B : string, C : float}) =
query q3
(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 <xml><body>
{cdata s}
</body></xml>
|
