function SelectSubqueryTest::testConditionSubquerySelect3

Tests we can use 2 subqueries with a relational operator in a WHERE clause.

File

core/tests/Drupal/KernelTests/Core/Database/SelectSubqueryTest.php, line 125

Class

SelectSubqueryTest

Tests the Select query builder.

Namespace

Code

public function testConditionSubquerySelect3() : void {
  // Create subquery 1, which is just a normal query object.
  $subquery1 = $this->connection
    ->select('test_task', 'tt');
  $subquery1->addExpression('AVG([tt].[priority])');
  $subquery1->where('[tt].[pid] = [t].[id]');
  // Create subquery 2, which is just a normal query object.
  $subquery2 = $this->connection
    ->select('test_task', 'tt2');
  $subquery2->addExpression('AVG([tt2].[priority])');
  // Create another query that adds a clause using the subqueries.
  $select = $this->connection
    ->select('test', 't');
  $select->addField('t', 'name');
  $select->condition($subquery1, $subquery2, '>');
  // The resulting query should be equivalent to:
  // SELECT t.name
  // FROM test t
  // WHERE (SELECT AVG(tt.priority) FROM test_task tt WHERE tt.pid = t.id) > (SELECT AVG(tt2.priority) FROM test_task tt2)
  $people = $select->execute()
    ->fetchCol();
  $this->assertEqualsCanonicalizing([
    'John',
  ], $people, 'Returned John.');
}