# DROP SEQUENCE

DROP SEQUENCE — remove a sequence

### Synopsis

```
DROP SEQUENCE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
```

### Description

`DROP SEQUENCE` removes sequence number generators. A sequence can only be dropped by its owner or a superuser.

### Parameters

`IF EXISTS`

Do not throw an error if the sequence does not exist. A notice is issued in this case.

*`name`*

The name (optionally schema-qualified) of a sequence.

`CASCADE`

Automatically drop objects that depend on the sequence, and in turn all objects that depend on those objects (see [Section 5.13](https://www.postgresql.org/docs/10/static/ddl-depend.html)).

`RESTRICT`

Refuse to drop the sequence if any objects depend on it. This is the default.

### Examples

To remove the sequence `serial`:

```
DROP SEQUENCE serial;
```

### Compatibility

`DROP SEQUENCE` conforms to the SQL standard, except that the standard only allows one sequence to be dropped per command, and apart from the `IF EXISTS` option, which is a PostgreSQL extension.

### See Also

[CREATE SEQUENCE](https://docs.postgresql.tw/11/reference/sql-commands/create-sequence), [ALTER SEQUENCE](https://docs.postgresql.tw/11/reference/sql-commands/alter-sequence)