Question

您能否帮助我在此查询中使用DISTINCT？

DECLARE @ReadData NVARCHAR(MAX);

SET @ReadData = 'SELECT ROW_NUMBER() OVER (ORDER BY RM.ReceiverDate) AS [S. No.] 
                    ,DISTINCT RM.ReceiverId 
                    ,RM.ReceiverDateas [Receiver Date]
                    ,VM.VendorName  as [Vendor Name]
                    ,VM.VendorID
            FROM Receiver RM
            LEFT OUTER JOIN VendorMaster VM on VM.VendorID = RM.VendorId
            WHERE  ['+ @ColumnName + '] LIKE 
                CASE WHEN ' + @Filter+ ' = 0  THEN  ''%' + @Value + '%'''+
                        ' WHEN ' + @Filter + ' = 1 THEN '''+ @Value + '%'''+ 
                        ' WHEN ' + @Filter + ' = 2 THEN ''%' + @Value +''' END  
                AND VM.IsActive = 1 
                AND RM.VendorID =  CASE WHEN ' +  CONVERT(VARCHAR, @VendorID) + ' = ''-1'' THEN RM.VendorID
                                     ELSE '+ CONVERT(VARCHAR, @VendorID) +' END
                AND (RM.ReceiverDate BETWEEN ' + CHAR(39) +  CONVERT(VARCHAR(23), @FromDate, 126) + CHAR(39) +'  AND  ' + CHAR(39) +  CONVERT(VARCHAR(23), @ToDate, 126) + CHAR(39) +')
                ORDER BY RM.ReceiverDate '

我的问题是：如何将DISTINCT添加到ReceiverId？

我收到此错误：

关键字＆＃39; DISTINCT＆＃39;附近的语法不正确。

后面的C＃代码

Answer 1

DECLARE @ReadData NVARCHAR(MAX);
    set @ReadData = 'SELECT * 
    ,ROW_NUMBER() OVER (ORDER BY ReceivedDate) AS [S. No.] 
    FROM (SELECT DISTINCT ReceiverId,
                     ReceivedDate
                     ,ReceiverName
                     , XYZ columns .....
                     From Receiver .........
                     INNER JOIN .......)'

您不能在同一级别使用row_number和distinct。

Answer 2

with cte 
as
(
Select ROW_NUMBER() OVER (PARTITION BY ReceiverId   ORDER BY ReceiverId  ) AS dupCount, *
from(
SELECT ROW_NUMBER() OVER (ORDER BY ReceivedDate) AS [S. No.]
                  ,RM.ReceiverId  
                  ,RM.ReceiverName'
                  ,VM.VendorName
                  , XYZ columns .....
                 From Receiver RM
                 LEFT OUTER JOIN VendorMaster VM on VM.VendorID = RM.VendorId 
) tab
)
select S. No.
                  ,ReceiverId  
                  ,ReceiverName
                  ,VendorName
                  , XYZ columns 
from cte 
where dupcount=1;

尝试使用cte。

如何将DISTINCT添加到选择查询中的列

2 个答案: