SQL SUM案例声明

Question

我有：

SUM
(
case
when LC.[DWC] = 0 and LC.BI = 1 then 1
else LC.[DWC] END AS DC
) 
AS [DWC]

但我收到一条错误消息：

  

＆＃39; SUM＆＃39;不是公认的内置函数名称。

我该如何解决这个问题？

Answer 1

假设您使用的是sql-server：

Select SUM(CASE WHEN (LC.[DWC] = 0 and LC.BI = 1) THEN 1 ELSE LC.[DWC] END) AS [DWC] 
FROM LC