Question

我有一个PIVOT情况。

源表列：

Title   Description    Datetime                  RecordsCount
A       California     2015-07-08 10:44:39.040     5
A       California     2015-07-08 12:44:39.040     6
A       California     2015-05-08 15:44:39.040     3
B       Florida        2015-07-08 16:44:39.040     2
B       Florida        2015-05-08 19:44:39.040     4

现在我需要将其转换为

                       2015-07-08     2015-05-08
Title   Description    
A       California       11              3
B       Florida           2              4

如果我们在相同的日期（无论时间）有两个记录计数，那么将它们相加，否则显示在不同的列中。

尝试写这样的东西，但它会引发错误。

Select * from #DataQualTest PIVOT (SUM(RecordCount) FOR DateTime IN (Select Datetime from #DataQualTest) ) AS Pivot_Table

请帮我解决这个问题。

由于

Answer 1

不完全是单词解决方案，但这应该给你一个方向。

create table #tmp
( 
    country varchar(max)
    , date1 datetime
    , record int
)

insert into #tmp values ('California', '2010-01-01', 2)
insert into #tmp values ('California', '2010-01-01', 5)
insert into #tmp values ('California', '2012-01-01', 1)
insert into #tmp values ('Florida', '2010-01-01', 3)
insert into #tmp values ('Florida', '2010-01-01', 5)

select * from #tmp
pivot (sum(record) for date1 in ([2010-01-01], [2012-01-01])) as avg

输出

country     2010-01-01  2012-01-01
California  7              1
Florida     8             NULL

Answer 2

如果您想要更灵活，则需要进行一些预处理才能从完整时间戳到天（以便稍后在PIVOT的分组中实际获得预期效果）：

CREATE VIEW DataQualTestView AS
  SELECT
    title
    , description
    , DATEFROMPARTS (DATEPART(yyyy, date_time),
                     DATEPART(mm, date_time),
                     DATEPART(dd, date_time)) AS day_from_date_time
    , recordsCount
  FROM DataQualTest
;

从那里你可以继续：

DECLARE @query AS NVARCHAR(MAX)
DECLARE @columns AS NVARCHAR(MAX)

SELECT @columns = ISNULL(@columns + ',' , '') 
                  + QUOTENAME(day_from_date_time)
FROM (SELECT DISTINCT
        day_from_date_time
      FROM DataQualTestView) AS TheDays

SET @query = 
  N'SELECT
    title
    , description
    , ' + @columns + '
  FROM DataQualTestView
  PIVOT(SUM(recordsCount) 
        FOR day_from_date_time IN (' + @columns + ')) AS Pivoted'

EXEC SP_EXECUTESQL @query

GO

......并且会得到：

| title | description | 2015-05-08 | 2015-07-08 |
|-------|-------------|------------|------------|
|     A |  California |          3 |         11 |
|     B |     Florida |          4 |          2 |

查看实际操作：SQL Fiddle。

如果需要调整/进一步详细说明，请发表评论。

带有多个日期的SQL Server数据透视表

2 个答案: