USE fetchmetrics;

SELECT CONCAT('WARNING: Table ', TABLE_SCHEMA, '.', TABLE_NAME, ' already exists.') AS msg_warning 
FROM INFORMATION_SCHEMA.TABLES 
WHERE 
        TABLE_SCHEMA = 'fetchmetrics' 
    AND TABLE_NAME = 'DOG_Location_Link'
;

CREATE TABLE IF NOT EXISTS fetchmetrics.DOG_Location_Link (
	  id_link INT NOT NULL AUTO_INCREMENT PRIMARY KEY
    , id_location_parent INT
    , CONSTRAINT FK_DOG_Location_Link_id_location_parent
        FOREIGN KEY (id_location_parent)
        REFERENCES fetchmetrics.DOG_Location(id_location)
    , id_location_child INT
    , CONSTRAINT FK_DOG_Location_Link_id_location_child
        FOREIGN KEY (id_location_child)
        REFERENCES fetchmetrics.DOG_Location(id_location)
    , active BIT NOT NULL DEFAULT 1
	, created_on DATETIME
    , id_user_created_by INT
    , CONSTRAINT FK_DOG_Location_Link_id_user_created_by
        FOREIGN KEY (id_user_created_by)
        REFERENCES fetchmetrics.DOG_User(id_user)
	, id_change_set INT
	, CONSTRAINT FK_DOG_Location_Link_id_change_set
		FOREIGN KEY (id_change_set) 
		REFERENCES fetchmetrics.DOG_Dog_Change_Set(id_change_set)
);