annotate tests/agg.ur @ 1394:d328983dc5a6
Allow subqueries to reference aggregate-only columns of free tables; treat non-COUNT aggregate functions as possibly returning NULL
| author |
Adam Chlipala <adam@chlipala.net> |
| date |
Sat, 15 Jan 2011 14:53:13 -0500 |
| parents |
601a77af0477 |
| children |
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| rev |
line source |
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adamc@235
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1 table t1 : {A : int, B : string, C : float}
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adamc@1187
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2 table t2 : {A : float, D : int, E : option string}
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adamc@235
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3
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adamc@1194
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4 val q1 : sql_query [] _ _ = (SELECT COUNT( * ) FROM t1)
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adamc@1194
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5 val q2 : sql_query [] _ _ = (SELECT AVG(t1.A) FROM t1)
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adamc@1194
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6 val q3 : sql_query [] _ _ = (SELECT SUM(t1.C) FROM t1)
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adamc@1194
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7 val q4 : sql_query [] _ _ = (SELECT MIN(t1.B), MAX(t1.A) FROM t1)
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adamc@1194
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8 val q5 : sql_query [] _ _ = (SELECT SUM(t1.A) FROM t1 GROUP BY t1.B)
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adamc@1194
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9 val q6 = (SELECT COUNT(t2.E) FROM t2 GROUP BY t2.D)
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adamc@237
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10
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adamc@1187
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11 fun main () : transaction page =
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adamc@1194
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12 xml <- queryX q6 (fn r => <xml>{[r.1]};</xml>);
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adamc@1194
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13 xml2 <- queryX q4 (fn r => <xml>{[r.1]}, {[r.2]};</xml>);
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adamc@1194
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14 return <xml><body>{xml}<br/>{xml2}</body></xml>
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