[role="xpack"]
[testenv="basic"]
[[sql-functions-system]]
=== System Functions

These functions return metadata type of information about the system being queried.

[[sql-functions-system-database]]
==== `DATABASE`

.Synopsis:
[source, sql]
--------------------------------------------------
DATABASE()
--------------------------------------------------

*Input*: _none_

*Output*: string

.Description:

Returns the name of the database being queried. In the case of Elasticsearch SQL, this
is the name of the Elasticsearch cluster. This function should always return a non-null
value.

[source, sql]
--------------------------------------------------
include-tagged::{sql-specs}/docs/docs.csv-spec[database]
--------------------------------------------------

[[sql-functions-system-user]]
==== `USER`

.Synopsis:
[source, sql]
--------------------------------------------------
USER()
--------------------------------------------------
*Input*: _none_

*Output*: string

.Description:

Returns the username of the authenticated user executing the query. This function can
return `null` in case <<elasticsearch-security,security>> is disabled.

[source, sql]
--------------------------------------------------
include-tagged::{sql-specs}/docs/docs.csv-spec[user]
--------------------------------------------------