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：
我想以更“优雅”的方式创建以下报告：
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' FROM MyTable T0 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：
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'
FROM MyTable T0
GROUP BY
T0.ItemCode
