在CASE中如何使用多个条件

Question

我想在WASE CASE中使用多个条件。

我遇到以下错误

  

消息4104，第16层，状态1，第18行

     

无法绑定多部分标识符“ TableName.AAADPAddNoOfDates”

SELECT CASE
   WHEN ((LTRIM(RTRIM(TableName.AAADPPapCode)) = (LTRIM(RTRIM(@PapCode))))
      AND (DATEDIFF(DAY, (CONVERT(date, @PubDate, 111)), (CONVERT(date, CURRENT_TIMESTAMP, 111)))) > (TableName.AAADPAddNoOfDates)
      AND (LTRIM(RTRIM(TableName.AAADPSysOperator))) != (LTRIM(RTRIM(@UserName)))) THEN 1
   ELSE 0
END AS ErrorTag;

Answer 1

CASE语句看起来不错，但是您缺少指定从中选择表的FROM子句。

Answer 2

您没有指定要从中检索输出的表格。

SELECT CASE
WHEN ((LTRIM(RTRIM(TableName.AAADPPapCode)) = (LTRIM(RTRIM(@PapCode))))
  AND (DATEDIFF(DAY, (CONVERT(date, @PubDate, 111)), (CONVERT(date, CURRENT_TIMESTAMP, 
111)))) > (TableName.AAADPAddNoOfDates)
  AND (LTRIM(RTRIM(TableName.AAADPSysOperator))) != (LTRIM(RTRIM(@UserName)))) THEN 1
ELSE 0
END AS ErrorTag
FROM TableName;