多项选择题
A. TRIM B. REPLACE C. TRUNC D. TO_DATE E. MOD F. CASE
Evaluate this SQL statement: SELECT e.EMPLOYEE_ID,e.LAS...
单项选择题Evaluate this SQL statement: SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME FROM EMP e, DEPARTMENT d WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID; In the statement, which capabilities of a SELECT statement are performed?（）
A. Selection, projection, join B. Difference, projection, join C. Selection, intersection, join D. Intersection, projection, join E. Difference, projection, product
You need to perform certain data manipulation operation...
单项选择题You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created. You want to look at the definition of the view (the SELECT statement on which the view was create.) How do you obtain the definition of the view? （）
A. Use the DESCRIBE command in the EMP_DEPT VU view. B. Use the DEFINE VIEW command on the EMP_DEPT VU view. C. Use the DESCRIBE VIEW command on the EMP_DEPT VU view. D. Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view. E. Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view. F. Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.
You need to display the last names of those employees w...
单项选择题You need to display the last names of those employees who have the letter "A" as the second character in their names. Which SQL statement displays the required results? （）
A. SELECT last_name FROM EMP WHERE last_ name LIKE '_A%'; B. SELECT last_name FROM EMP WHERE last name ='*A%' C. SELECT last_name FROM EMP WHERE last name ='_A%'; D. SELECT last_name FROM EMP WHERE last name LIKE '*A%'
