MYSQL:根据if语句两次获取结果

Question

我试图从部门表中获取每个部门，从员工表中获取富有和贫穷员工的数量。 到目前为止，我能够得到其中的一个，但似乎无法弄清楚如何为每个部门将富人和穷人写在两行上。

SELECT Depts.Department, IF (Employees.Salary>100000, 'Rich', 'Poor'), 
COUNT(*)  FROM `Employees`, `Depts` 
WHERE Depts.Dept = Employees.Dept 
GROUP BY Depts.Department

感谢您的帮助

Answer 1

最清晰的方法是合并结果；

SELECT Depts.Department, 'Poor', COUNT(*)
FROM `Employees`, `Depts`
WHERE Depts.Dept = Employees.Dept AND Employees.Salary <= 100000
GROUP BY Depts.Department

UNION

SELECT Depts.Department, 'Rich', COUNT(*)
FROM `Employees`, `Depts`
WHERE Depts.Dept = Employees.Dept AND Employees.Salary > 100000,
GROUP BY Depts.Department