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annotate tests/sql_ops.ur @ 1886:b7cd3c7c7edd

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Interpret 'table' signature items more flexibly, automatically adding (Ur) constraints to support a kind of subtyping over (SQL) constraint sets
author Adam Chlipala <adam@chlipala.net>
date Mon, 04 Nov 2013 15:14:23 -0500
parents 5d494183ca89
children
rev   line source
adamc@559 1 table t : { A : int, B : float }
adamc@559 2
adamc@559 3 val q = (SELECT t.A + t.A AS X, t.B * t.B AS Y FROM t)
adamc@559 4
adamc@559 5 fun main () : transaction page =
adamc@559 6 xml <- queryX q (fn r => <xml>{[r.X]}, {[r.Y]}<br/></xml>);
adamc@559 7 return <xml><body>{xml}</body></xml>
adamc@559 8