How to Identify Foreign Key Constraints in MySQL Tables and Columns?

Identifying Foreign Key Constraints in MySQL

In MySQL, it is often necessary to retrieve a comprehensive view of foreign key constraints associated with a specific table or column. This information is crucial for understanding database relationships and ensuring data integrity.

Foreign Keys to a Table

To obtain a list of all foreign key constraints that point to a particular table, the following query can be used:

SELECT 
  TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME
FROM
  INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE
  REFERENCED_TABLE_SCHEMA = (SELECT DATABASE()) AND
  REFERENCED_TABLE_NAME = '<table>' \G

Foreign Keys to a Column

Similarly, to identify foreign key constraints that reference a specific column within a table, the query can be modified:

SELECT 
  TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME
FROM
  INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE
  REFERENCED_TABLE_SCHEMA = (SELECT DATABASE()) AND
  REFERENCED_TABLE_NAME = '<table>' AND
  REFERENCED_COLUMN_NAME = '<column>' \G

It is important to replace '

' with the actual table name, and '' with the specific column name of interest.

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