下面哪个语句关于GROUP BY 和HAVING语句的使用是正确的是?() A: SELECT<br/>JOB_ID, DEPARTMENT_ID, AVG(SALARY) FROM EMPLOYEES GROUP BY JOB_ID<br/>HAVING AVG(SALARY) &gt; 3000; B: SELECT<br/>JOB_ID, DEPARTMENT_ID, AVG(SALARY) FROM EMPLOYEES GROUP BY JOB_ID,<br/>DEPARTMENT_ID HAVING AVG(SALARY) &gt; 3000; C: SELECT<br/>JOB_ID, DEPARTMENT_ID, AVG(SALARY) FROM EMPLOYEES GROUP BY<br/>AVG(SALARY) HAVING AVG(SALARY) &gt; 3000; D: FROM<br/>EMPLOYEES GROUP BY JOB_ID, DEPARTMENT_ID HAVING SALARY &gt; 3000;

下面哪个语句关于GROUP BY 和HAVING语句的使用是正确的？（) A: A.SELECT JOB_ID , DEPARTMENT_ID , AVG(SALARY)FROM EMPLOYEES GROUP BY JOB_IDHAVING AVG(SALARY) > 3000; B: B.SELECT JOB_ID , DEPARTMENT_ID , AVG(SALARY)FROM EMPLOYEES GROUP BY JOB_ID ,DEPARTMENT_IDHAVING AVG(SALARY) > 3000; C: C.SELECT JOB_ID , DEPARTMENT_ID , AVG(SALARY)FROM EMPLOYEES GROUP BY AVG(SALARY)HAVING AVG(SALARY) > 3000; D: D.SELECT JOB_ID , DEPARTMENT_ID , AVG(SALARY)FROM EMPLOYEES GROUP BY JOB_ID , DEPARTMENT_IDHAVING SALARY > 3000;

13. A. The marketing Department B. The Production Department C. The Sales Department D. The Engineering Department

血液科 A: Surgical Department B: hematology department C: Department of Stomatology D: Internal Medicine Department

Linka Company has a total of five departments, namely, the R&D department, the finance department, the sales department, the production department and the HR department.

SQL语句“Create Table department(id integer,name char(10))”,需要SqlCommand对象的哪一个方法在执行？（ ） A: ExecuteXmlReader() B: ExecuteNonQuery() C: ExecuteScalar() D: ExecuteReader()

In an information system department, the operations department is responsible for ________.

M______ (市场营销）Department is an important department in the company.

To effectively implement the marketing concept, the marketing department in an organisation needs to work with _________. A: all departments B: the production department C: the sales department D: the accounting department

If the patient has a fever and a headache, he is supposed to go to the__________. A: Internal Medicine Department B: Respiratory Department C: ENT Department D: Surgical Department