information_schema.user_statistics.user

mysql

mariadb

type: VARCHAR(48) NULL
Note:
The username. The value '#mysql_system_user#' appears when there is no username (such as for the slave SQL thread).
© 2022 MariaDB
5.1-10.8
type: VARCHAR(48) NOT NULL
Note:
The username. The value '#mysql_system_user#' appears when there is no username (such as for the slave SQL thread).
© 2022 MariaDB
10.2-10.7

tidb

postgres

cockroachdb

mssql