`information_schema.referential_constraints.unique_constraint_name`

mysql

type: VARCHAR NULL

5.7-8

type: NULL

Note:

Referenced key name, together with UNIQUE_CONSTRAINT_SCHEMA and REFERENCED_TABLE_NAME identifies the referenced key.

5.1-10.8

type: SQL_IDENTIFIER NULL

Note:

Name of the unique or primary key constraint that the foreign key constraint references

10-15

type: SQL_IDENTIFIER

Note:

Name of the unique or primary key constraint that the foreign key constraint references

7.4-9.6

type: unknown

Note:

Name of the UNIQUE or PRIMARY KEY constraint.

2.1-21.2

Note:

Name of the unique or primary key constraint.

type: SYSNAME NULL

Note:

UNIQUE constraint.