试题详情
- 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?（）
A、A
B、B
C、C
D、D
E、E
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