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

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;

巴特西

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

最新文章

热门文章