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python学习(2) 题解(15)

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题解 | #汇总各个部门当前员工的title类型的分配数目#

连接在一起group by就行了where都不用 select d1.dept_no,d1.dept_name,t.title,count(t.title) from departments d1 join dept_emp d2 on (d1.dept_no=d2.dept_no) join ti...

Mysql

2022-04-23

1 365

题解简单易懂一个where搞定

select d1.emp_no,d2.emp_no,s.salary,s2.salary from dept_emp d1 join dept_manager d2 (on d1.dept_no=d2.dept_no) join salaries s on (d1.emp_no=s.emp_no)...

Mysql

2022-04-23

1 374

题解 | #查找在职员工自入职以来的薪水涨幅情况#

union all 改成union也行 select emp_no,max(s1)-min(s1) growth from( select emp_no,salary s1 from salaries where from_date in(select distinct min(from_date)...

Mysql

2022-04-22

1 270

题解 |套两层娃即可

select e.emp_no,s.salary,e.last_name,e.first_name from employees e join salaries s on e.emp_no=s.emp_no where s.salary>=all ( select salary from sa...

Mysql

2022-04-22

1 282

题解 | #获取每个部门中当前员工薪水最高的相关信息#

select distinct a1.dept_no, a1.emp_no,salary from dept_emp a1 join salaries b1 on a1.emp_no=b1.emp_no, (select dept_no dep, max(salary) sala from de...

Mysql

2022-04-22

2 227

题解 | #获取每个部门中当前员工薪水最高的相关信息#

select distinct a1.dept_no, a1.emp_no,salary from dept_emp a1 join salaries b1 on a1.emp_no=b1.emp_no, (select dept_no dep, max(salary) sala from de...

Mysql

2022-04-22

2 221