--分組函數 select avg(salary),max(salary),min(salary),sum(salary) from employees

運行結果

--判斷大小 select max(last_name),min(last_name),max(hire_date),min(hire_date) from employees

?運行結果

--計數 select count(employee_id),count(last_name),count(hire_date) from employees

運行結果

--求平均值 select avg(salary),sum(salary)/count(salary) from employees;

運行結果

--計算不為空 select count(commission_pct) from employees

運行結果

-- select count(distinct department_id) from employees

--查出員工表里面的平均工資 select department_id,avg(salary) from employees group by department_id

運行結果

--查出員工表里面的平均工資 select department_id,job_id,avg(salary) from employees group by department_id,job_id

運行結果

--查出員工表里面的平均工資大于6000 以及平均工資 select department_id,avg(salary) from employees having avg(salary)>6000 --where department_id in (40,60,80) group by department_id

運行結果

總結

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