算法的重要性，我就不多说了吧，想去大厂，就必须要经过基础知识和业务逻辑面试+算法面试。所以，为了提高大家的算法能力，这个公众号后续每天带大家做一道算法题，题目就从LeetCode上面选 ！
今天和大家聊的问题叫做 2016年的投资，我们先来看题面：
https://leetcode-cn.com/problems/investments-in-2016/
Write a query to print the sum of all total investment values in 2016 (TIV_2016), to a scale of 2 decimal places, for all policy holders who meet the following criteria:
Have the same TIV_2015 value as one or more other policyholders.
Are not located in the same city as any other policyholder (i.e.: the (latitude, longitude) attribute pairs must be unique).
解题
SELECT SUM(insurance.TIV_2016) AS TIV_2016
FROM insurance
WHERE insurance.TIV_2015 IN
(SELECT TIV_2015 FROM insurance
GROUP BY TIV_2015
HAVING COUNT(*) > 1)
AND CONCAT(LAT, ",", LON) IN
(SELECT CONCAT(LAT, ",", LON) FROM insurance
GROUP BY LAT , LON
HAVING COUNT(*) = 1);好了，今天的文章就到这里，如果觉得有所收获，请顺手点个在看或者转发吧，你们的支持是我最大的动力 。
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