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设ABC表有三列A、B、C,并且都是整数类型,则以下( )查询语句能够按照B列进行分组,并在每一组中取C的平均值。
A select avg(C) from ABC
B select avg(C) from ABC order by B
C select avg(C) from ABC group by B
D select avg(C) from ABC group by C, B
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更多 “ 设ABC表有三列A、B、C,并且都是整数类型,则以下( )查询语句能够按照B列进行分组,并在每一组中取C的平均值。 A select avg(C) from ABCB select avg(C) from ABC order by BC select avg(C) from ABC group by BD select avg(C) from ABC group by C, B ” 相关考题
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多选题Click the Exhibit button and examine the data in the EMPLOYEES table. Which three subqueries work?（）ASELECT * FROM employees where salary (SELECT MIN(salary) FROM employees GROUP BY department_id);BSELECT * FROM employees WHERE salary = (SELECT AVG(salary) FROM employees GROUP BY department_id);CSELECT distinct department_id FROM employees WHERE salary ANY (SELECT AVG(salary) FROM employees GROUP BY department_id);DSELECT department_id FROM employees WHERE salary ALL (SELECT AVG(salary) FROM employees GROUP BY department_id);ESELECT last_name FROM employees WHERE salary ANY (SELECT MAX(salary) FROM employees GROUP BY department_id);FSELECT department_id FROM employees WHERE salary ALL (SELECT AVG(salary) FROM employees GROUP BY AVG(SALARY));
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