Question

请帮助我 mssql问题。我有一些表结构：

Category   amt    year  month  
cat1      800.00  2013  jan  
cat2       30.00  2013  jan  
cat3      120.00  2013  feb  
cat4      125.00  2013  feb

我希望数据来源（逐月）示例...

Month    cat1     cat2     cat3     cat4  
jan     800.00    30.00     0.00     0.00  
feb       0.00     0.00   120.00   125.00

Answer 1

您可以使用PIVOT。请检查查询：

SELECT 
    [Month], 
    isnull(cat1, 0.00) cat1, 
    isnull(cat2, 0.00) cat2, 
    isnull(cat3, 0.00) cat3, 
    isnull(cat4, 0.00) cat4 
FROM(
        SELECT 'cat1' Category, 800.00 amt,2013 [year], 'jan' [month] UNION
        SELECT 'cat2' Category, 30.00 amt, 2013 [year], 'jan' [month] UNION
        SELECT 'cat3' Category, 120.00 amt, 2013 [year], 'feb' [month] UNION
        SELECT 'cat4' Category, 125.00 amt, 2013 [year], 'feb' [month]
    )UP
    PIVOT (SUM(amt) FOR Category IN (cat1, cat2, cat3, cat4)) AS PVT

Answer 2

如果我理解正确，您希望在交叉表中获取数据？如果是这种情况，您可以使用数据透视表。

select
    month
  , coalesce(cat1,0) as cat1
  , coalesce(cat2,0) as cat2
  , coalesce(cat3,0) as cat3
  , coalesce(cat4,0) as cat4
from tbl
pivot(sum(amt) for category in ([cat1], [cat2], [cat3], [cat4])) p

按月和类别获取sql数据组作为列

2 个答案: