| The following workshop is composed of a series of quiz questions and practical exercises. The quiz questions are designed to test your overall understanding of the current material. The practical exercises are intended to afford you the opportunity to apply the concepts discussed during the current hour, as well as build upon the knowledge acquired in previous hours of study. Please take time to complete the quiz questions and exercises before continuing. Refer to Appendix C,"Answers to Quizzes and Exercises," for answers. Quiz Refer to the Oracle syntax covered in this hour for the following quiz questions. | 1: | Is the syntax correct for the following compound queries? If not, what would correct the syntax? Use the EMPLOYEE_TBL and the EMPLOYEE_PAY_TBL shown as follows : | EMPLOYEE_TBL | | | EMP_ID | VARCHAR(9) | NOT NULL, | | LAST_NAME | VARCHAR(15) | NOT NULL, | | FIRST_NAME | VARCHAR(15) | NOT NULL, | | MIDDLE_NAME | VARCHAR(15), | | | ADDRESS | VARCHAR(30) | NOT NULL, | | CITY | VARCHAR(15) | NOT NULL, | | STATE | VARCHAR(2) | NOT NULL, | | ZIP | INTEGER(5) | NOT NULL, | | PHONE | VARCHAR(10), | | | PAGER | VARCHAR(10), | | CONSTRAINT EMP_PK PRIMARY KEY (EMP_ID) | EMPLOYEE_PAY_TBL | | | EMP_ID | VARCHAR(9) | NOT NULL, | PRIMARY KEY | | POSITION | VARCHAR(15) | NOT NULL, | | | DATE_HIRE | DATETIME, | | | | PAY_RATE | DECIMAL(4,2) | NOT NULL, | | | DATE_LAST_RAISE | DATE, | | | | SALARY | DECIMAL(8,2), | | | | BONUS | DECIMAL(6,2), | | | CONSTRAINT EMP_FK FOREIGN KEY (EMP_ID) REFERENCES EMPLOYEE_TBL (EMP_ID) -
SELECT EMP_ID, LAST_NAME, FIRST_NAME FROM EMPLOYEE_TBL UNION SELECT EMP_ID, POSITION, DATE_HIRE FROM EMPLOYEE_PAY_TBL; This compound query does not work because the data types do not match. The EMP_ID columns match, but the LAST_NAME and FIRST_NAME data types do not match the POSITION and DATE_HIRE data types. -
SELECT EMP_ID FROM EMPLOYEE_TBL UNION ALL SELECT EMP_ID FROM EMPLOYEE_PAY_TBL ORDER BY EMP_ID; Yes, the statement is correct. -
SELECT EMP_ID FROM EMPLOYEE_PAY_TBL INTERSECT SELECT EMP_ID FROM EMPLOYEE_TBL ORDER BY 1; Yes, this compound query works. | Match the correct operator to the following statements. | Statement | Operator | | a | Show duplicates | | b | Return only rows from the first query that match those in the second query | | c | Return no duplicates | | d | Return only rows from the first query not returned by the second | | UNION INTERSECT UNION ALL EXCEPT | Exercises | Q1: | Refer to the Oracle syntax covered in this hour for the following exercises. Write your queries out by hand on a sheet of paper because MySQL does not support the operators covered in this hour. When you are finished, compare your results to mine. Using the CUSTOMER_TBL and the ORDERS_TBL as listed: | CUSTOMER_TBL | | | CUST_IN | VARCHAR(10) | NOT NULL | PRIMARY KEY | | CUST_NAME | VARCHAR(30) | NOT NULL, | | | CUST_ADDRESS | VARCHAR(20) | NOT NULL, | | | CUST_CITY | VARCHAR(15) | NOT NULL, | | | CUST_STATE | VARCHAR(2) | NOT NULL, | | | CUST_ZIP | INTEGER(5) | NOT NULL, | | | CUST_PHONE | INTEGER(10), | | | | CUST_FAX | INTEGER(10) | | | | ORDERS_TBL | | | ORD_NUM | VARCHAR(10) | NOT NULL | PRIMARY KEY | | CUST_ID | VARCHAR(10) | NOT NULL, | | | PROD_ID | VARCHAR(10) | NOT NULL, | | | QTY | INTEGER(6) | NOT NULL, | | | ORD_DATE | DATETIME | | | | |
