执行具有 case 语句和连接的选择查询时出错

Question

我在执行包含 case 语句和连接的选择查询时遇到错误。

关键字“IS”附近的语法不正确..

SELECT pb.Id,
         pb.Name,
            CASE 
            pb.Firstname
            WHEN (pb.lastName IS NULL OR pb.lastName = 'No') THEN 'Yes'
            ELSE pb.Firstname END,              
               pb.Email,
                   CASE 
                   pb.MiddleName
                   WHEN (pb.Code = 1 OR pb.Code IS NULL) THEN 'Yes' 
                   ELSE pb.MiddleName END AS MiddleName
FROM Table1 a
JOIN
  Table2 pb
ON
  Table1.Id = Table2.Id

谁能建议这个查询有什么问题？ 提前致谢

Answer 1

您正在混合两种形式的大小写。你想要的表格——搜索到case——在case之后没有一列：

        (CASE WHEN pb.lastName IS NULL OR pb.lastName = 'No' THEN 'Yes'
              ELSE pb.Firstname
         END) as Firstname,              
        pb.Email,
        (CASE WHEN pb.Code = 1 OR pb.Code IS NULL THEN 'Yes' 
              ELSE pb.MiddleName
         END) AS MiddleName

我猜你希望第一个 CASE 表达式具有别名 FirstName。