DatabaseCondition::exists in core/includes/database/query.inc
Sets a condition that the specified subquery returns values.
DeleteQuery::exists in core/includes/database/query.inc
MergeQuery::exists in core/includes/database/query.inc
Sets a condition that the specified subquery returns values.
SelectQuery::exists in core/includes/database/select.inc
SelectQueryExtender::exists in core/includes/database/select.inc
Sets a condition that the specified subquery returns values.
UpdateQuery::exists in core/includes/database/query.inc