Demand Use "id_{context}" to name fields of external identification codes and "{context}_id" to internal ones. Description When creating a column in a table that reference an id (identification code) of a table located at the database you are dealing it should be named as "{Table Name}_id". When creating a column in a table that reference an id of a context external to the database you are dealing with it should be named as "id_{Context Name}". Examples 1: CREATE TABLE customer ( 2: id INT NOT NULL, 3: name VARCHAR(100) NOT NULL, 4: id_ssn COMMENT ' the United States, the Social Security number', 5: user_id INT NULL COMMENT 'if the customer have a system login it will be refernced here', 6: PRIMARY KEY (id), 7: UNIQUE `uq_ssn` (`ssn`), 8: CONSTRAINT `fk_customers_user_id_users_user_id` 9: FOREIGN KEY (`user...