> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/sql-functions/pseudo-columns/_rowid.md).

# \_rowid

## Syntax

```bnf
_rowid
```

## Description

The `_rowid` pseudo column is mapped to the primary key in the related table. This can be used as a replacement of the `rowid` pseudo column in other databases. Another usage is to simplify sql queries as one doesn't have to know the name of the primary key.

## Examples

```sql
CREATE TABLE t1 (a INT PRIMARY KEY, b VARCHAR(80));
INSERT INTO t1 VALUES (1,"one"),(2,"two");
SELECT * FROM t1 WHERE _rowid=1;
```

```
+---+------+
| a | b    |
+---+------+
| 1 | one  |
+---+------+
```

```sql
UPDATE t1 SET b="three" WHERE _rowid=2;
SELECT * FROM t1 WHERE _rowid>=1 AND _rowid<=10;
```

```
+---+-------+
| a | b     |
+---+-------+
| 1 | one   |
| 2 | three |
+---+-------+
```

<sub>*This page is licensed: CC BY-SA / Gnu FDL*</sub>

{% @marketo/form formId="4316" %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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://mariadb.com/docs/server/reference/sql-functions/pseudo-columns/_rowid.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.