SQL Query for Foreign constraint

Hi sir

Currently I am using following query on mysql :

* SHOW TABLES; ---> To get list of table in a particular db.
*
SELECT TABLE_NAME, CONSTRAINT_NAME, COLUMN_NAME,
REFERENCED_TABLE_NAME, REFERENCED_COLUMN_NAME from
information_schema.key_column_usage WHERE constraint_schema
='myDBName';
---> to get foreign constraint information.
* SHOW INDEX FROM myTableName FROM myDBName;

I am required to get above information from postgres.

I didn't find postgres query corresponding to above mysql query to fetch
corresponding information.

PS : help me for above query in postgres.

Best Regards.
Bhim