`information_schema.column_udt_usage.udt_name`

mysql

type: SQL_IDENTIFIER NULL

Note:

Name of the column data type (the underlying type of the domain, if applicable)

10-15

type: SQL_IDENTIFIER

Note:

Name of the column data type (the underlying type of the domain, if applicable)

7.4-9.6

type: unknown

Note:

Name of the column data type.