sp_fkeys and sp_foreignkeys are two system procedures available in SQL Server giving information about foreignkeys. Then what exactly is difference between them? For this lets see the syntax of both.sp_fkeys---------------sp_fkeys @pktable_name, @pktable_owner, @pktable_qualifier, @fktable_name, @fktable_owner, @fktable_qualifierIf you see from above sp_fkeys accept the above parameters and returns the information on foreign keys. All parameters are optional. If you pass only the pk table information, it lists all the tables where this pk column is used as a foreign key. Alternatively if you pass only fk table information it returns details of all tables related to passed table in pk fk relationshipNow lets see the syntax for sp_foreignkeyssp_foreignkeys @table_server, @pktab_name, @pktab_schema, @pktab_catalog , @fktab_name, @fktab_schema , @fktab_catalogAs you see from above the first parameter is table server name. This is because sp_foreignkeys retrieves details of foreign key relationships from linked server. so we need to pass the linked server name as first parameter for sp_foreignkeys. the other parameters have exactly same meaning as in sp_fkeys.Similarly sp_pkeys and sp_primarykeys procedures differ in same way.