Mercurial > urweb

view tests/agg.ur @ 1600:8128fcb2d4a4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix catalog querying about empty tables
author Adam Chlipala <adam@chlipala.net>
date Fri, 18 Nov 2011 17:44:12 -0500
parents 601a77af0477
children
line wrap: on
line source
table t1 : {A : int, B : string, C : float}
table t2 : {A : float, D : int, E : option string}

val q1 : sql_query [] _ _ = (SELECT COUNT( * ) FROM t1)
val q2 : sql_query [] _ _ = (SELECT AVG(t1.A) FROM t1)
val q3 : sql_query [] _ _ = (SELECT SUM(t1.C) FROM t1)
val q4 : sql_query [] _ _ = (SELECT MIN(t1.B), MAX(t1.A) FROM t1)
val q5 : sql_query [] _ _ = (SELECT SUM(t1.A) FROM t1 GROUP BY t1.B)
val q6 = (SELECT COUNT(t2.E) FROM t2 GROUP BY t2.D)

fun main () : transaction page =
    xml <- queryX q6 (fn r => <xml>{[r.1]};</xml>);
    xml2 <- queryX q4 (fn r => <xml>{[r.1]}, {[r.2]};</xml>);
    return <xml><body>{xml}<br/>{xml2}</body></xml>