7 methods override Query::execute()

Delete::execute in core/lib/Drupal/Core/Database/Query/Delete.php
Executes the DELETE query.
Insert::execute in core/lib/Drupal/Core/Database/Query/Insert.php
Executes the insert query.
Merge::execute in core/lib/Drupal/Core/Database/Query/Merge.php
Runs the query against the database.
Select::execute in core/lib/Drupal/Core/Database/Query/Select.php
Runs the query against the database.
Truncate::execute in core/lib/Drupal/Core/Database/Query/Truncate.php
Executes the TRUNCATE query.
Update::execute in core/lib/Drupal/Core/Database/Query/Update.php
Executes the UPDATE query.
Upsert::execute in core/lib/Drupal/Core/Database/Query/Upsert.php
Runs the query against the database.

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