How do I find all the foreign keys in a database

This is very long query. Optionally, we can limit the query to return results for one or more than one table.

SELECT        K_Table  = FK.TABLE_NAME,        FK_Column = CU.COLUMN_NAME,        PK_Table  = PK.TABLE_NAME,        PK_Column = PT.COLUMN_NAME,        Constraint_Name = C.CONSTRAINT_NAME FROM       INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS C INNER JOIN  INFORMATION_SCHEMA.TABLE_CONSTRAINTS FK ON C.CONSTRAINT_NAME = FK.CONSTRAINT_NAME INNER JOIN      INFORMATION_SCHEMA.TABLE_CONSTRAINTS PK ON C.UNIQUE_CONSTRAINT_NAME = PK.CONSTRAINT_NAME INNER JOIN      INFORMATION_SCHEMA.KEY_COLUMN_USAGE CU ON C.CONSTRAINT_NAME = CU.CONSTRAINT_NAME INNER JOIN  (        SELECT      i1.TABLE_NAME, i2.COLUMN_NAME        FROM        INFORMATION_SCHEMA.TABLE_CONSTRAINTS i1            INNER JOIN      INFORMATION_SCHEMA.KEY_COLUMN_USAGE i2 ON i1.CONSTRAINT_NAME = i2.CONSTRAINT_NAME                WHERE       i1.CONSTRAINT_TYPE = 'PRIMARY KEY'        ) PT ON PT.TABLE_NAME = PK.TABLE_NAME  ---- optional: ORDER BY        1,2,3,4 WHERE      PK.TABLE_NAME='something'WHERE      FK.TABLE_NAME='something'  WHERE      PK.TABLE_NAME IN ('one_thing', 'another')  WHERE      FK.TABLE_NAME IN ('one_thing', 'another')