Ur/Web: tests/subquery.ur annotate

Switching to a more dynamic method of handling database reconnection, restarting transactions

author	Adam Chlipala <adam@chlipala.net>
date	Sat, 17 Oct 2015 11:08:12 -0400
parents	9c82548c97e9
children

rev	line source
adamc@1191	1 table t : { A : int, B : int, C : int }
adamc@1191	2
adamc@1191	3 fun main () =
adamc@1191	4 v <- queryX1 (SELECT t.A, t.C
adamc@1191	5 FROM t
adamc@1191	6 WHERE t.B = (SELECT MAX(U.B) AS M
adamc@1191	7 FROM t AS U
adamc@1191	8 WHERE U.A = t.A))
adamc@1192	9 (fn r => <xml>{[r.A]},{[r.C]};</xml>);
adamc@1192	10 v' <- queryX1 (SELECT t.A, t.C
adamc@1192	11 FROM (SELECT t.A AS A, MAX(t.B) AS B
adamc@1192	12 FROM t
adamc@1192	13 GROUP BY t.A) AS Maxes
adamc@1192	14 JOIN t ON t.A = Maxes.A AND t.B = Maxes.B)
adamc@1192	15 (fn r => <xml>{[r.A]},{[r.C]};</xml>);
adamc@1192	16 return <xml><body>
adamc@1192	17 {v}<br/>
adamc@1192	18 {v'}
adamc@1192	19 </body></xml>

Mercurial > urweb