https://api.drupal.org/api/drupal/core%21tests%21Drupal%21KernelTests%21Core%21Database%21SelectSubqueryTest.php/9
SelectSubqueryTest.php | Drupal API
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https://api.drupal.org/api/drupal/core%21tests%21Drupal%21KernelTests%21Core%21Database%21SelectSubqueryTest.php/function/SelectSubqueryTest%3A%3AtestConditionSubquerySelect3/11.x
function SelectSubqueryTest::testConditionSubquerySelect3 | Drupal API
functiondrupalapi