> 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.md).

# Pseudo Columns

{% columns %}
{% column %}
{% content-ref url="/pages/lc4ejhsVolFIfuCGRXf8" %}
[\_rowid](/docs/server/reference/sql-functions/pseudo-columns/_rowid.md)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
Access the unique row identifier. This pseudo column often aliases the primary key, allowing direct row access even if the primary key column name is unknown.
{% endcolumn %}
{% endcolumns %}