LeetCode（数据库）- 按分类统计薪水

Posted 2021-12-30 程序员牧码

题目链接：点击打开链接

题目大意：略。

解题思路：略。

AC 代码

WITH t AS(SELECT 'Low Salary' category
UNION ALL
SELECT 'Average Salary'
UNION ALL
SELECT 'High Salary'),

tt AS(SELECT CASE WHEN income < 20000 THEN 'Low Salary'
WHEN income > 50000  THEN 'High Salary'
ELSE 'Average Salary'
END category
FROM Accounts)

SELECT t.category, COUNT(tt.category) accounts_count
FROM t LEFT JOIN tt USING(category)
GROUP BY t.category