From 5cff28cfa1dbd661b49468066570bb44f7cb441c Mon Sep 17 00:00:00 2001
From: "Eloy Lafuente (stronk7)" <stronk7@moodle.org>
Date: Thu, 15 Dec 2011 13:07:18 +0100
Subject: [PATCH] MDL-30739 add one test to confirm the solution is cross-db

---
 lib/dml/simpletest/testdml.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/dml/simpletest/testdml.php b/lib/dml/simpletest/testdml.php
index fce8f4044f5..f7c2152b603 100644
--- a/lib/dml/simpletest/testdml.php
+++ b/lib/dml/simpletest/testdml.php
@@ -919,6 +919,17 @@ class dml_test extends UnitTestCase {
         $this->assertTrue($DB->execute($sql, array('3')));
         $this->assertEqual($DB->count_records($tablename1, array('course' => 6)), 2);
 
+        // update records with subquery condition
+        // confirm that the option not using table aliases is cross-db
+        $sql = "UPDATE {{$tablename1}}
+                   SET course = 0
+                 WHERE NOT EXISTS (
+                           SELECT course
+                             FROM {{$tablename2}} tbl2
+                            WHERE tbl2.course = {{$tablename1}}.course
+                              AND 1 = 0)"; // Really we don't update anything, but verify the syntax is allowed
+        $this->assertTrue($DB->execute($sql));
+
         // insert from one into second table
         $sql = "INSERT INTO {{$tablename2}} (course)