Question

我的Sql server中有以下类型的数据： -

Field         Value   Month

Administrative  5   November
Counteracting   7   November
District1       9   November
District2       6   November
Administrative  1   December
Counteracting   2   December
District1       3   December
District2       4   December
Administrative  9   January
Counteracting   8   January
District1       5   January
District2       6   January

现在问题是我无法弄清楚如何以下列格式显示这些数据： -

Field         November   December   January

Administrative  5          1          9
Counteracting   7          2          8  
District1       9          3          5
District2       6          4          6

Answer 1

您要做的是PIVOT数据。有几种方法可以执行此操作。如果您提前知道这些值，那么您可以对值进行硬编码。

您可以使用带有CASE语句的聚合函数：

select field,
  sum(case when month ='November' then value end) November,
  sum(case when month ='December' then value end) December,
  sum(case when month ='January' then value end) January,
  etc
from yourtable
group by field

请参阅SQL Fiddle with Demo

在SQL Server 2005+中，您可以使用PIVOT函数：

select field, November, December, January
from
(
  select field,
    value, month
  from yourtable
) src
pivot
(
  sum(value)
  for month in (November, December, January, etc)
) piv

请参阅SQL Fiddle with Demo

如果你有一个未知数量的值要转换成列，那么你可以使用动态sql来转移数据。

Answer 2

这是一个典型的转轴问题。查看SQL Server PIVOT语句：http://msdn.microsoft.com/en-us/library/ms177410(v=sql.105).aspx

它将解决您的问题。

Answer 3

您需要使用Pivot，请查看示例：

http://blogs.msdn.com/b/spike/archive/2009/03/03/pivot-tables-in-sql-server-a-simple-sample.aspx

sql查询（在列中显示唯一行）

3 个答案: