SQL汇总报告,寻找优雅的解决方案

前端之家收集整理的这篇文章主要介绍了SQL汇总报告,寻找优雅的解决方案前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。
我有一个包含3列的表:ItemCode,Quantity和DocDate.
我想以更“优雅”的方式创建以下报告:
  1. SELECT T0.ItemCode,(SELECT SUM(QUANTITY) FROM MyTable T1 WHERE YEAR(T0.DocDate) = 2011 AND T0.ItemCode = T1.ItemCode) AS '2011',(SELECT SUM(QUANTITY) FROM MyTable T1 WHERE YEAR(T0.DocDate) = 2012 AND T0.ItemCode = T1.ItemCode) AS '2012'
  2. FROM MyTable T0
  3. GROUP BY T0.ItemCode,YEAR(T0.DocDate)

我很确定有更好,更有效的方式来编写这个,但我无法想出正确的语法.有任何想法吗?

解决方法

你可以试试这个:
  1. SELECT T0.ItemCode,SUM(CASE WHEN YEAR(T0.DocDate) = 2011 THEN QUANTITY ELSE 0 END) AS '2011',SUM(CASE WHEN YEAR(T0.DocDate) = 2012 THEN QUANTITY ELSE 0 END) AS '2012'
  2. FROM MyTable T0
  3. GROUP BY
  4. T0.ItemCode

猜你在找的MsSQL相关文章