annotate tests/group_by.ur @ 1272:56bd4a4f6e66
Some serious bug-fix work to get HTML example to compile; this includes fixing a bug with 'val' patterns in Unnest and the need for more local reduction in Especialize
| author |
Adam Chlipala <adamc@hcoop.net> |
| date |
Thu, 03 Jun 2010 13:04:37 -0400 |
| parents |
d1b679dbbc25 |
| children |
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| rev |
line source |
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adamc@226
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1 table t1 : {A : int, B : string, C : float}
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2 table t2 : {A : float, D : int}
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3
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4 val q1 = (SELECT * FROM t1 GROUP BY t1.B)
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5 val q2 = (SELECT * FROM t1, t2 GROUP BY t1.B, t2.D, t1.A)
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adamc@227
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6
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7 val q3 = (SELECT * FROM t1 WHERE t1.A = 0 GROUP BY t1.B)
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8 val q4 = (SELECT * FROM t1 WHERE t1.A = 0 GROUP BY t1.B HAVING t1.B <> 'Bad')
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9
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10 val q5 = (SELECT t1.A, t2.D FROM t1, t2 GROUP BY t2.D, t1.A)
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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)
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adamc@255
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12
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13
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14 datatype list a = Nil | Cons of a * list a
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15
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16 val r1 : transaction (list {B : string}) =
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17 query q4
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18 (fn fs acc => return (Cons (fs.T1, acc)))
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19 Nil
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20
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21 val r2 : transaction string =
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22 ls <- r1;
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23 return (case ls of
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24 Nil => "Problem"
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25 | Cons ({B = b, ...}, _) => b)
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26
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27 val main : unit -> transaction page = fn () =>
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28 s <- r2;
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29 return <html><body>
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30 {cdata s}
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31 </body></html>
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