`information_schema.constraint_column_usage.column_name`

mysql

type: SQL_IDENTIFIER NULL

Note:

Name of the column that is used by some constraint

10-15

type: SQL_IDENTIFIER

Note:

Name of the column that is used by some constraint

7.4-9.6

type: unknown

Note:

Name of the column that is used by some constraint.

2.1-21.2

type: NVARCHAR(128) NULL

Note:

Column name.