In this post, you’ll learn more about the MariaDB Error 1212 ER_UNION_TABLES_IN_DIFFERENT_DIR with the details of the error message and why you receive this error
Maria DB Error Description
MariaDB Error 1212 – ER_UNION_TABLES_IN_DIFFERENT_DIR with the sqlState HY000
Error Description for the MariaDB Error ER_UNION_TABLES_IN_DIFFERENT_DIR
Incorrect table definition; all MERGE tables must be in the same database