`information_schema.columns.domain_name`

mysql

type: SQL_IDENTIFIER NULL

Note:

If the column has a domain type, the name of the domain, else null.

10-15

type: SQL_IDENTIFIER

Note:

If the column has a domain type, the name of the domain, else null.

7.4-9.6

type: unknown

Note:

Always NULL (unsupported by CockroachDB).

type: NVARCHAR(128) NULL

Note:

If the column is a user-defined data type, this column is the name of the user-defined data type. Otherwise, NULL is returned.