Mercurial > urweb

annotate tests/relops.lac @ 229:016d71e878c1

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Relational operators; string literals for SQL
author Adam Chlipala <adamc@hcoop.net>
date Thu, 21 Aug 2008 15:27:04 -0400
parents
children
rev   line source
adamc@229 1 table t1 : {A : int, B : string, C : float}
adamc@229 2 table t2 : {A : float, D : int}
adamc@229 3
adamc@229 4 val q1 = (SELECT * FROM t1
adamc@229 5 UNION SELECT * FROM t1)
adamc@229 6 val q2 = (SELECT t1.A, t1.B FROM t1 WHERE t1.A = 0
adamc@229 7 INTERSECT SELECT t1.B, t1.A FROM t1 WHERE t1.B = t1.B)
adamc@229 8 val q3 = (SELECT t1.A, t1.B, t1.C FROM t1 WHERE t1.A = 0
adamc@229 9 INTERSECT SELECT * FROM t1 WHERE t1.B = 'Hello world!'
adamc@229 10 EXCEPT SELECT * FROM t1 WHERE t1.A < t1.A)