Question

我有一个非常复杂的查询：

DECLARE @cols AS NVARCHAR(MAX),
        @query  AS NVARCHAR(MAX),
        @archivedate date = '5/1/2019'; 

WITH 
E(n) AS(
    SELECT n FROM (VALUES(0),(0),(0),(0),(0),(0),(0),(0),(0),(0))E(n)
),
E2(n) AS(
    SELECT a.n FROM E a, E b
),
E4(n) AS(
    SELECT a.n FROM E2 a, E2 b
),
cteTally(n) AS(
    SELECT TOP((SELECT TOP (1) COUNT(DISTINCT ratechangedate) datecount
                FROM MARS_DW.[dbo].[vw_GTMScheduledRateAndPaymentChangesWithAccountNumber_Archive]
                WHERE ArchiveDate = @archivedate
                GROUP BY account
                ORDER BY datecount DESC)) ROW_NUMBER() OVER(ORDER BY (SELECT NULL)) n
    FROM E4
)        
SELECT @cols = (SELECT REPLACE( '
    ,MIN( CASE WHEN index_num = <<index_num>> THEN ratechangedate END) AS [date <<index_num>>]
    ,MIN( CASE WHEN index_num = <<index_num>> THEN new_noterate END)   AS [rate <<index_num>>]' , '<<index_num>>', n)
            FROM cteTally
            ORDER BY n
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 

set @query = 
N'WITH a AS (
    SELECT a.account,
        dense_rank() OVER ( PARTITION BY a.account ORDER BY ratechangedate) AS index_num,
        ratechangedate,
        new_noterate
    FROM MARS_DW.[dbo].[vw_GTMScheduledRateAndPaymentChangesWithAccountNumber_Archive] a
    WHERE archivedate = @date
    )
SELECT a.Account' + @cols + N'
FROM a
GROUP BY a.Account;'


EXECUTE sp_executesql @query, N'@date datetime', @date = @archivedate;

我希望得到相同的结果，但不取消帐户。当我删除a.Account时，出现此错误：

第15级州立1行10的消息102
'，'附近的语法不正确。

我很抱歉，我对SQL还是很陌生，所以我可以理解为什么它可能没有应有的意义。

Answer 1

如果您只想从结果集中隐藏帐户，而其余所有数据保持不变，请更改此行

SELECT a.Account' + @cols + N'

到

SELECT ' + STUFF(@cols, 1, <n>, '') + N'

如Jeroen Mostert所说。

您需要找到参数值，该值必须是@cols中第一个空格的数量加上逗号。参见STUFF

如何修改复杂的查询

1 个答案: