DELETE FROM [db_name.]table_name [AS alias] [WHERE predicate]
Delete the rows that match a predicate. When no predicate is provided, delete all rows.
DELETE FROM events WHERE date < '2017-01-01'
DELETE supports subqueries in the
WHERE predicate, including
NOT EXISTS, and scalar subqueries.
DELETE FROM all_events WHERE session_time < (SELECT min(session_time) FROM good_events) DELETE FROM orders AS t1 WHERE EXISTS (SELECT oid FROM returned_orders WHERE t1.oid = oid) DELETE FROM events WHERE category NOT IN (SELECT category FROM events2 WHERE date > '2001-01-01')
The following types of subqueries are not supported:
- Nested subqueries, that is, an subquery inside another subquery
NOT INsubquery inside an
OR, for example,
a = 3 OR b NOT IN (SELECT c from t)
In most cases, you can rewrite
NOT IN subqueries using
NOT EXISTS. We recommend using
NOT EXISTS whenever possible, as
NOT IN subqueries can be slow.