合并排序均不成功

Question

这个SQL出于某种目的，但是即使我给出了一个排序子句（按tdate排序）仍然不是明智的排序日期。 如何重写以获取排序的“ tdate”列：

SELECT TOP 100 PERCENT * 
FROM   (SELECT TOP 100 PERCENT tdate, 
                               parti, 
                               Abs(Sum(amtdr)) AS Dr, 
                               Sum(amtcr)      AS Cr, 
                               nart 
        FROM   dbo.dbo_dayb a 
        WHERE  ( account = 'bank' ) 
        GROUP  BY idno, 
                  tdate, 
                  parti, 
                  nart 
        UNION ALL 
        SELECT tdate, 
               parti, 
               amtdr, 
               amtcr, 
               nart 
        FROM   dbo.dbo_dayb 
        WHERE  ( account = N'PDC account' ) 
               AND ( post = N'Cr' )) DERIVEDTBL 
ORDER  BY tdate 

Answer 1

 ((SELECT TOP 100 PERCENT * FROM 
 (SELECT TOP 100 PERCENT tdate, parti, 
 ABS(SUM(amtdr)) AS Dr, SUM(amtcr) AS Cr, nart FROM 
 dbo.dbo_dayb a 
 WHERE (account = 'bank') 
 GROUP BY idno, tdate, parti, nart) 

 UNION ALL 

 (SELECT tdate, parti, amtdr, amtcr, nart 
 FROM dbo.dbo_dayb 
 WHERE (account = N'PDC account') 
 AND (post = N'Cr')) DERIVEDTBL) )

 ORDER BY tdate

尝试这个

Answer 2

从视图返回数据时，即使您使用order by子句，SQL也会对您的数据重新排序。 解决这个问题的一种技巧是使用ROW_NUMBER（）

SELECT *, ROW_NUMBER() OVER (ORDER BY tdate) AS [ordinal]
FROM (SELECT tdate, parti, ABS(SUM(amtdr)) AS Dr, SUM(amtcr) AS Cr, nart
      FROM dbo.dbo_dayb a
      WHERE       (account = 'bank')
      GROUP BY idno, tdate, parti, nart
      UNION ALL
      SELECT      tdate, parti, amtdr, amtcr, nart
      FROM          dbo.dbo_dayb
      WHERE      (account = N'PDC account') AND (post = N'Cr')
) derived

请注意，按特定顺序从视图中获取数据的最佳方法是在要用来检索数据的查询中添加一个orderby。 （那是保证工作的唯一方法）