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Get list of foreign key constraints in MySQL

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Release： 2023-08-31 11:53:10

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Get list of foreign key constraints in MySQL

Suppose we have a database "business" that contains multiple tables. If you want to display only foreign key constraints, use the following query -

mysql> select *
   &minus;> from information_schema.referential_constraints
   &minus;> where constraint_schema = &#39;business&#39;;

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The following is the output to display only foreign key constraints -

+--------------------+-------------------+--------------------------+---------------------------+--------------------------+------------------------+--------------+-------------+-------------+-------------------+-----------------------+
| CONSTRAINT_CATALOG | CONSTRAINT_SCHEMA | CONSTRAINT_NAME          | UNIQUE_CONSTRAINT_CATALOG | UNIQUE_CONSTRAINT_SCHEMA | UNIQUE_CONSTRAINT_NAME | MATCH_OPTION | UPDATE_RULE | DELETE_RULE | TABLE_NAME       | REFERENCED_TABLE_NAME |
+--------------------+-------------------+--------------------------+---------------------------+--------------------------+------------------------+--------------+-------------+-------------+-------------------+-----------------------+
| def                | business          | ConstChild               | def                       | business                 | PRIMARY                | NONE         | NO ACTION   | NO ACTION | childdemo         | parentdemo |
| def                | business          | ConstFK                  | def                       | business                 | PRIMARY                | NONE         | NO ACTION   | NO ACTION | tblf | tblp |
| def                | business          | constFKPK                | def                       | business                 | PRIMARY                | NONE         | NO ACTION   | NO ACTION | foreigntable      | primarytable1 |
| def                | business          | FKConst                  | def                       | business                 | PRIMARY                | NONE         | NO ACTION   | NO ACTION | foreigntabledemo | primarytabledemo |
| def                | business          | primarytable1demo_ibfk_1 | def                       | business                 | PRIMARY                | NONE         | NO ACTION   | NO ACTION | primarytable1demo| foreigntable1 |
| def                | business          | StudCollegeConst         | def                       | business                 | PRIMARY                | NONE         | NO ACTION   | NO ACTION   | studentenrollment| college |
+--------------------+-------------------+--------------------------+---------------------------+--------------------------+------------------------+--------------+-------------+-------------+-------------------+-----------------------+
6 rows in set (0.07 sec)

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