Question

我在下面有2张桌子。 公共列为ObjectId。

表1 ：

    Year  ObjectId G_Amount
   =====  ======== ========-
    2010  1234       5.00
    2010  1234       5.00
    2010  5678      10.00
    2010  5678      20.00
    2010  5678      50.00
    2012  9101       0.00
    2012  1122      70.00
    2012  1122     100.00

表2 ：

    ObjectId   I_Amount
   =========  ===========-
    1234       10.00
    1234       30.00
    5678       15.00
    5678       20.00
    9101       25.00
    9101       35.00
    1122       10.00
    1122        0.00

我想加入上面2个表，以便结果集如下所示。应该按年份显示G_Amount（表1中每年的g_amount总数）和I_Amount（表2中每年的i_amount总数）。

结果集：

    Year  G_Amount  I_Amount
    ===== ========  ========-
    2010   90.00     75.00
    2012  170.00     70.00

有人可以帮忙吗？

Answer 1

您的数据模型允许对象ID在多年内出现。因此，相关的表2条目将被相乘，即被添加到这些年的每一年。如果您不想这样做，则需要一个单独的表，每个对象一个记录。

同样，您将仅按年份和对象ID汇总第一个表，而仅按对象ID汇总第二个表。然后加入并再次聚合以获得年份。

select
  t1.year,
  sum(t1.totalg) as total_g_amount,
  coalesce(sum(t2.totali), 0) as total_i_amount
from 
(
  select Year, ObjectId, sum(G_Amount) as totalg
  from table1 
  group by Year, ObjectId
) t1
left join
(
  select ObjectId, sum(i_Amount) as totali
  from table2
  group by ObjectId
) t2 on t2.ObjectId = t1.ObjectId
group by t1.year
order by t1.year;

Answer 2

类似的方法适用于您的数据集。我为LEFT JOIN中所有不在Table1中的值添加了Table2：

SELECT
    T1.[Year]
    , SUM(T1.G_Amount_Total) G_Amount
    , ISNULL(SUM(T2.I_Amount_Total), 0) I_Amount
FROM
    (
        SELECT
            [Year]
            , ObjectId
            , SUM(G_Amount) G_Amount_Total
        FROM Table1
        GROUP BY
            [Year]
            , ObjectId
    ) T1
    LEFT JOIN
        (
            SELECT
                ObjectId
                , SUM(I_Amount) I_Amount_Total
            FROM Table2
            GROUP BY ObjectId
        ) T2
    ON T1.ObjectId = T2.ObjectId
GROUP BY T1.[Year]

我确实看到您的数据结构存在一些潜在问题，例如，Year中没有Table2引用，但是，如果您的数据受到控制，则应该全部解决。

Answer 3

尝试一下，无论如何，我还是T-SQL的新手，所以可能是错误的。

Select DISTINCT T1.Year 
       SUM (T1.G_Amount) as G_Amount,
       SUM (T2.I_Amount) AS I_Amount
from table1 T1 join Table2 T2 on T1.ObjectID = T2.ObjectID

联接两个2表以获取每年的总和-SQL Server

3 个答案: