修改查询sql

Question

我有一个查询将数据从 1 分钟聚合（压缩）到任何其他时间范围，并且它工作得很好。

Use StockDataFromSella;
DECLARE @D1 DateTime 
DECLARE @D2 DateTime 
DECLARE @Interval FLOAT 

SET @D1  = '2008-09-21T09:00:00.000' 
SET @D2  = '2010-10-20T17:30:00.000'
SET @Interval = 15 

;WITH  
L0 AS (SELECT 1 AS c UNION ALL SELECT 1), 
L1 AS (SELECT 1 AS c FROM L0 A CROSS JOIN L0 B), 
L2 AS (SELECT 1 AS c FROM L1 A CROSS JOIN L1 B), 
L3 AS (SELECT 1 AS c FROM L2 A CROSS JOIN L2 B), 
L4 AS (SELECT 1 AS c FROM L3 A CROSS JOIN L3 B), 
Nums AS (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 0)) AS i FROM L4), 
Ranges AS( 
SELECT  
      DATEADD(MINUTE,@Interval*(i-1),@D1) AS StartRange, 
      DATEADD(MINUTE,@Interval*i,@D1) AS NextRange 
FROM Nums where i <= 1+CEILING(DATEDIFF(MINUTE,@D1,@D2)/@Interval)) 
,cte AS ( 
SELECT  
     *  
     ,ROW_NUMBER() OVER (PARTITION BY Simbolo,r.StartRange ORDER BY [DataOra])      AS RN_ASC  
     ,ROW_NUMBER() OVER (PARTITION BY Simbolo,r.StartRange ORDER BY [DataOra] DESC) AS RN_DESC 
FROM Ranges r 
JOIN dbo.tbl1MinENI p  ON p.[DataOra] >= r.StartRange and p.[DataOra] < r.NextRange ) 
SELECT  
      Simbolo, 
      MAX(CASE WHEN RN_ASC=1 THEN [DataOra] END) AS DataOra, 
      MAX(CASE WHEN RN_ASC=1 THEN [Apertura] END) AS [Apertura], 
      MAX(Massimo) Massimo, 
      MIN(Minimo)  Minimo, 
      MAX(CASE WHEN RN_DESC=1 THEN [Chiusura] END) AS [Chiusura],
      SUM(Volume) Volume
      /*MAX(CASE WHEN RN_DESC=1 THEN [DataOra] END) AS ChiusuraDataOra*/
FROM cte 
GROUP BY Simbolo,StartRange 
ORDER BY DataOra

我想将第二列 DataOra(DateTime) 分成两个不同的列，一列用于日期（如果可能采用 dd/mm/yyyy 格式），第二列仅用于时间。 非常感谢任何帮助，谢谢。 阿尔贝托

Answer 1

获取这些值的最简单方法是使用CONVERT。当您转换日期时，SQL Server 有一些内置的日期格式。

 CONVERT(VARCHAR, MAX(CASE WHEN RN_ASC=1 THEN [DataOra] END), 103) AS DataOraDate, 
 CONVERT(VARCHAR, MAX(CASE WHEN RN_ASC=1 THEN [DataOra] END), 114) AS DataOraTime, 

这两个代码（103 和 114）对应于您想要的格式。请参阅 http://msdn.microsoft.com/en-us/library/ms187928。 aspx 了解有关这些格式以及您可以转换成的其他格式的更多详细信息。

Answer 2

看来您只需要更改选择即可。
而不是这个

MAX(CASE WHEN RN_ASC=1 THEN [DataOra] END) AS DataOra, 

使用这个：

CONVERT(VARCHAR(8),MAX(CASE WHEN RN_ASC=1 THEN [DataOra] END),108) AS HourMinuteSecond,
CONVERT(VARCHAR(8),MAX(CASE WHEN RN_ASC=1 THEN [DataOra] END),101) AS DateOnly,

希望它有帮助。