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comparison tests/group_by.ur @ 255:69d337f186eb

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Monoized GROUP BY
author Adam Chlipala <adamc@hcoop.net>
date Sun, 31 Aug 2008 15:04:10 -0400
parents 71bafe66dbe1
children d1b679dbbc25
comparison
equal deleted inserted replaced
254:f8d9395575ec 255:69d337f186eb
7 val q3 = (SELECT * FROM t1 WHERE t1.A = 0 GROUP BY t1.B) 7 val q3 = (SELECT * FROM t1 WHERE t1.A = 0 GROUP BY t1.B)
8 val q4 = (SELECT * FROM t1 WHERE t1.A = 0 GROUP BY t1.C HAVING t1.C < 0.2) 8 val q4 = (SELECT * FROM t1 WHERE t1.A = 0 GROUP BY t1.C HAVING t1.C < 0.2)
9 9
10 val q5 = (SELECT t1.A, t2.D FROM t1, t2 GROUP BY t2.D, t1.A) 10 val q5 = (SELECT t1.A, t2.D FROM t1, t2 GROUP BY t2.D, t1.A)
11 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) 11 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)
12
13
14 datatype list a = Nil | Cons of a * list a
15
16 val r1 : transaction (list {B : string}) =
17 query q1
18 (fn fs acc => return (Cons (fs.T1, acc)))
19 Nil
20
21 val r2 : transaction string =
22 ls <- r1;
23 return (case ls of
24 Nil => "Problem"
25 | Cons ({B = b, ...}, _) => b)
26
27 val main : unit -> transaction page = fn () =>
28 s <- r2;
29 return <html><body>
30 {cdata s}
31 </body></html>