Table name: TRUCK Primary key: TRUCK NUM Foreign key: BASE_CODE, TYPE_CODE Database name: Ch03_TransCo Table name: BASE Primary key: BASE_CODE Foraian kexv nono Table name: TYPE Primary key: TYPE_CODE Foreign key: none Use the database shown in Figure P3.17 to answer Problems 17-23. 17. For each table, identify the primary key and the foreign key(s). If a table does not have a foreign key, write None. 18. Do the tables exhibit entity integrity? Answer yes or no, and then explain your answer. 19. Do the tables exhibit referential integrity? Answer yes or no, and then explain your answer. Write NA (Not Applicable) if the table does not have a foreign key. 20. Identify the TRUCK table's candidate key(s). 21. For each table, identify a superkey and a secondary key. 22. Create the ERD for this database