【案例讲解】排序查询

#1.查询员工的姓名和部门号和年薪，按年薪降序 按姓名升序


SELECT last_name,department_id,salary*12*(1+IFNULL(commission_pct,0)) 年薪
FROM employees
ORDER BY 年薪 DESC,last_name ASC;




#2.选择工资不在8000到17000的员工的姓名和工资，按工资降序
SELECT last_name,salary
FROM employees


WHERE salary NOT BETWEEN 8000 AND 17000
ORDER BY salary DESC;


#3.查询邮箱中包含e的员工信息，并先按邮箱的字节数降序，再按部门号升序


SELECT *,LENGTH(email)
FROM employees
WHERE email LIKE '%e%'
ORDER BY LENGTH(email) DESC,department_id ASC;