QUESTIONS 3, 4, 5, 6 and 7 REFER TO THE RELATIONAL TABLES LISTED BELOW CHEATE TABLE STAFF ENUM DECIMAL (12) NOT NULL 7. Staft employee number FNAME VARCHAR(50) NOT NULL, First name LNAME VARCHAR (50) NOT NULL 7. Last name DOD DATE NULL. 1 Date of birth CONSTRAINT SZAFF_PKEY PRIMARY KEY (ENUM) : CREATE TABLE DRIVER ENUM DECIMAL (12) NOT NULLA 7. staff employee number LNUM DECIMAL (8) NOT NULL / Driving license number STATUS VARCHAR(10) NOT NULL, Driver status CONSTRAINT DRIVER_PKEY PRIMARY KEY (ENUM). CONSTRAINT DRIVER UNIQUE UNIQUE (LINUM). CONSTRAINT DRIVER FREY FOREIGN KEYLENUM) REFERENCES STAFF IENUM), CONSTRAINT DRIVER STATUS CHECK STATUS IN AVAILABLE, IN SERVICE, ON LEAVE CREATE TABLE TRUCK REGNUM VARCHAR(10) NOT NULL 1. Registration number CAPACITY DECIMAL (7) NOT NULL / Capacity WEIGHT DECIMAL (7) NOT NULL, /Weight STATUS VARCHAR(10) NOT NULL 7. Present status CONSTRAINT TRUCK PREY PRIMARY KEY REGNUM), CONSTRAINT TRUCK STATUS CHECK (STATUS IN "AVAILABLE", USED, MAINTAINED). CONSTRAINT TRUCK_WEIGHT CHECK (WEIGHT > 0.0 AND WEIGHT 0.0 AND CAPACITY