Ur/Web: tests/agg.ur annotate

Constraint syntax

author	Adam Chlipala <adamc@hcoop.net>
date	Tue, 05 May 2009 14:36:16 -0400
parents	7a7efbb3e354
children	ad9829c3c12c

rev	line source
adamc@235	1 table t1 : {A : int, B : string, C : float}
adamc@235	2 table t2 : {A : float, D : int}
adamc@235	3
adamc@236	4 val q1 = (SELECT COUNT( * ) AS X FROM t1)
adamc@236	5 val q2 = (SELECT AVG(t1.A) AS X FROM t1)
adamc@236	6 val q3 = (SELECT SUM(t1.C) AS X FROM t1)
adamc@236	7 val q4 = (SELECT MIN(t1.B) AS X, MAX(t1.A) AS Y FROM t1)
adamc@237	8
adamc@237	9 (val q5 = (SELECT t1.A FROM t1 GROUP BY t1.B))
adamc@237	10 val q5 = (SELECT SUM(t1.A) AS X FROM t1 GROUP BY t1.B)
adamc@265	11
adamc@265	12
adamc@265	13 datatype list a = Nil \| Cons of a * list a
adamc@265	14
adamc@266	15 val r1 : transaction (list string) =
adamc@266	16 query q4
adamc@265	17 (fn fs acc => return (Cons (fs.X, acc)))
adamc@265	18 Nil
adamc@265	19
adamc@265	20 val main : unit -> transaction page = fn () =>
adamc@265	21 n <- r1;
adamc@265	22 return <html><body>Nothing to see here!</body></html>

Mercurial > urweb