【单选题】Click the Exhibit button and examine the data in the EMPLOYEES table. On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID. The JOB_ID col...
A.
There is no row with dept_id 90 in the EMPLOYEES table.
B.
You cannot delete the JOB_ID column because it is a NOT NULL column.
C.
You cannot specify column names in the DELETE clause of the DELETE statement.
D.
You cannot delete the EMPLOYEE_ID column because it is the primary key of the table.
【简答题】_____ A. He lost his classmate’s homework. B. He can’t help the woman with her math. C. He broke the woman’s calculator. D. He doesn’t know where the ON button is.
【单选题】空调工程水系统的设备与附属设备、管道、管配件及阀门的型号、规格、材质及连接形式应符合设计规定。检查数量要求( )
【单选题】Click the Exhibit button and examine the data from the ORDERS and CUSTOMERS tables. Evaluate this SQL statement: SELECT cust_id, ord_total FROM orders WHERE ord_total > ANY(SELECT ord_total FROM order...
【单选题】用于潮热骨蒸、盗汗、遗精、消渴等最佳药物是
【判断题】大阅读活动的核心是“师生家长同参与,学科门类全覆盖”。()
【判断题】由于物流中心的平面布局不同,所选用的设备型号和数量以及区域大小和布置方案都不同。()
【单选题】用于潮热骨蒸、盗汗、遗精、消渴等的最佳药物是
【单选题】Click the Exhibit button and examine the data from the ORDERS and CUSTOMERS tables. Evaluate the SQL statement: SELECT * FROM orders WHERE cust_id = (SELECT cust_id FROM customers WHERE cust_name = 'S...