2019.12.3 LeetCode 從零單刷個人筆記整理(持續更新)
github:https://github.com/ChopinXBP/LeetCode-Babel
編寫一個 SQL 查詢,獲取 Employee 表中第二高的薪水(Salary) 。
+----+--------+
| Id | Salary |
+----+--------+
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
+----+--------+
例如上述 Employee 表,SQL查詢應該返回 200 作爲第二高的薪水。如果不存在第二高的薪水,那麼查詢應返回 null。
+---------------------+
| SecondHighestSalary |
+---------------------+
| 200 |
+---------------------+
SELECT IFNULL(
(SELECT DISTINCT(Salary)
FROM Employee
ORDER BY Salary DESC
LIMIT 1, 1)
, NULL) 'SQL.SecondHighestSalary';
#Coding一小時,Copying一秒鐘。留個言點個讚唄,謝謝你#