单项选择题
A.create groups of data
B.sort data in a specific order
C.convert data to a different format
D.retrieve data based on an unknown condition
单项选择题 Click the Exhibit button to examine the data of the EMPLOYEES table. Evaluate this SQL statement: SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.employee_id "Mgr_id", m.emp_name "Manager" FROM employees e JOIN employees m ON (e.mgr_id = m.employee_id) AND e.salary > 4000; What is its output?（）
多项选择题 For which two actions can you use the TO_DATE function? （）
多项选择题 Evaluate the SQL statement: TRUNCATE TABLE DEPT;Which three are true about the SQL statement? （）