How do I see all foreign keys to a table or column?

Posted 2020-08-13 功夫 熊猫

 

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For a Table: SELECT TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = ‘<database>‘ AND REFERENCED_TABLE_NAME = ‘<table>‘; For a Column: SELECT TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = ‘<database>‘ AND REFERENCED_COLUMN_NAME = ‘<column>‘; Basically, we changed REFERENCED_TABLE_NAME with REFERENCED_COLUMN_NAME in the where clause.

 

use INFORMATION_SCHEMA;
select TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME,
REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME from KEY_COLUMN_USAGE
where TABLE_SCHEMA = "<your_database_name>" and TABLE_NAME = "<your_table_name>" 
and referenced_column_name is not NULL;