Mercurial > urweb
annotate tests/relops.ur @ 2035:a3435112b83e
Top.max and Top.min
author | Adam Chlipala <adam@chlipala.net> |
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date | Sun, 29 Jun 2014 08:33:47 -0400 |
parents | e933297c4e24 |
children |
rev | line source |
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adamc@229 | 1 table t1 : {A : int, B : string, C : float} |
adamc@229 | 2 table t2 : {A : float, D : int} |
adamc@229 | 3 |
adamc@229 | 4 val q1 = (SELECT * FROM t1 |
adamc@229 | 5 UNION SELECT * FROM t1) |
adamc@229 | 6 val q2 = (SELECT t1.A, t1.B FROM t1 WHERE t1.A = 0 |
adamc@229 | 7 INTERSECT SELECT t1.B, t1.A FROM t1 WHERE t1.B = t1.B) |
adamc@229 | 8 val q3 = (SELECT t1.A, t1.B, t1.C FROM t1 WHERE t1.A = 0 |
adamc@229 | 9 INTERSECT SELECT * FROM t1 WHERE t1.B = 'Hello world!' |
adamc@260 | 10 EXCEPT SELECT * FROM t1 WHERE t1.A < t1.A |
adamc@260 | 11 UNION SELECT * FROM t1 WHERE t1.A > t1.A) |
adamc@260 | 12 |
adamc@260 | 13 datatype list a = Nil | Cons of a * list a |
adamc@260 | 14 |
adamc@260 | 15 val r1 : transaction (list {A : int, B : string, C : float}) = |
adamc@260 | 16 query q3 |
adamc@260 | 17 (fn fs acc => return (Cons (fs.T1, acc))) |
adamc@260 | 18 Nil |
adamc@260 | 19 |
adamc@260 | 20 val r2 : transaction string = |
adamc@260 | 21 ls <- r1; |
adamc@260 | 22 return (case ls of |
adamc@260 | 23 Nil => "Problem" |
adamc@260 | 24 | Cons ({B = b, ...}, _) => b) |
adamc@260 | 25 |
adamc@260 | 26 val main : unit -> transaction page = fn () => |
adamc@260 | 27 s <- r2; |
adamc@1070 | 28 return <xml><body> |
adamc@260 | 29 {cdata s} |
adamc@1070 | 30 </body></xml> |