# 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](/11/reference/sql-commands/create-sequence.md), [ALTER SEQUENCE](/11/reference/sql-commands/alter-sequence.md)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.postgresql.tw/11/reference/sql-commands/drop-sequence.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.