Test NOT EXISTS subquery conditionals on SELECT statements.

We essentially select all rows from the {test} table that don't have matching rows in the {test_people} table based on the shared name column.

File

modules/simpletest/tests/database_test.test, line 2008

Class

DatabaseSelectSubqueryTestCase

Test case for subselects in a dynamic SELECT query.

Code

function testNotExistsSubquerySelect() {
 // Put George into {test_people}.
 db_insert ('test_people')->fields (array(
 'name' => 'George',
 'age' => 27,
 'job' => 'Singer',
 ))
 ->execute ();
 // Base query to {test}.
 $query = db_select ('test', 't')->fields ('t', array(
 'name',
 ));
 // Subquery to {test_people}.
 $subquery = db_select ('test_people', 'tp')->fields ('tp', array(
 'name',
 ))
 ->where ('tp.name = t.name');
 $query->notExists ($subquery);
 // Ensure that we got the right number of records.
 $people = $query->execute ()
 ->fetchCol ();
 $this->assertEqual (count ($people), 3, 'NOT EXISTS query returned the correct results.');
}

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