> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/15/internals/54.-system-views/pg_sequences.md).

# 54.23. pg\_sequences

## 54.23. pg\_sequences

The view `pg_sequences` provides access to useful information about each sequence in the database.

**Table 54.23. `pg_sequences` Columns**

| <p>Column Type</p><p>Description</p>                                                                                                                                                                               |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| <p><code>schemaname</code> <code>name</code> (references <a href="/15/internals/system-catalogs/pg_namespace.md"><code>pg\_namespace</code></a>.<code>nspname</code>)</p><p>Name of schema containing sequence</p> |
| <p><code>sequencename</code> <code>name</code> (references <a href="/15/internals/system-catalogs/pg_class.md"><code>pg\_class</code></a>.<code>relname</code>)</p><p>Name of sequence</p>                         |
| <p><code>sequenceowner</code> <code>name</code> (references <a href="/15/internals/system-catalogs/pg_authid.md"><code>pg\_authid</code></a>.<code>rolname</code>)</p><p>Name of sequence's owner</p>              |
| <p><code>data\_type</code> <code>regtype</code> (references <a href="/15/internals/system-catalogs/pg_type.md"><code>pg\_type</code></a>.<code>oid</code>)</p><p>Data type of the sequence</p>                     |
| <p><code>start\_value</code> <code>int8</code></p><p>Start value of the sequence</p>                                                                                                                               |
| <p><code>min\_value</code> <code>int8</code></p><p>Minimum value of the sequence</p>                                                                                                                               |
| <p><code>max\_value</code> <code>int8</code></p><p>Maximum value of the sequence</p>                                                                                                                               |
| <p><code>increment\_by</code> <code>int8</code></p><p>Increment value of the sequence</p>                                                                                                                          |
| <p><code>cycle</code> <code>bool</code></p><p>Whether the sequence cycles</p>                                                                                                                                      |
| <p><code>cache\_size</code> <code>int8</code></p><p>Cache size of the sequence</p>                                                                                                                                 |
| <p><code>last\_value</code> <code>int8</code></p><p>The last sequence value written to disk. If caching is used, this value can be greater than the last value handed out from the sequence.</p>                   |

The `last_value` column will read as null if any of the following are true:

* The sequence has not been read from yet.
* The current user does not have `USAGE` or `SELECT` privilege on the sequence.
* The sequence is unlogged and the server is a standby.

***

原文：[PostgreSQL 15.19 Documentation](/15/internals/54.-system-views/pg_sequences.md)（英文原文，待翻譯）


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