SQL查询从多列中获取多个最大值

SQL Query To Get Multiple Max Values From Multiple Columns(SQL查询从多列中获取多个最大值)

问题描述

我想弄清楚如何从多列中提取多个最大值.以下是一些示例数据:

I am trying to figure out how to pull multiple max values from multiple columns. Here is some sample data:

DATE | A | B | C

4/4/2011 | 64.4 | 62.1 | 33.3

4/5/2011 | 34.6 | 33.5 | 32.3

4/6/2011 | 33.1 | 49.4 | 32.1

4/7/2011 | 55.2 | 32.8 | 33.5

4/8/2011 | 31.2 | 50.1 | 30.4

4/9/2011 | 31.7 | 31.1 | 30.4

我想要前 5 名:

4/4/2011 | 64.4

4/4/2011 | 62.1

4/7/2011 | 55.2

4/8/2011 | 50.1

4/6/2011 | 49.4

谢谢

推荐答案

怎么样:

SELECT TOP 5 Date, Val 
FROM (SELECT Date, A as Val FROM T
      UNION ALL
      SELECT Date, B FROM T
      UNION ALL
      SELECT DATE, C FROM T
) AS x
ORDER BY x.Val DESC

这篇关于SQL查询从多列中获取多个最大值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！