Question

为了简化表格结构，我将使用一个简单的表格样本。假设我有这张表：

Quantity

我需要每月获得Select Month(date), Sum(Quantity) from tablename Group By Month(date)的总和，包括没有交易的月份

我试过这个，但它只显示交易数月。

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不介意这一年。让我们说该表仅包含当前年度数据

Answer 1

创建一个存储月份的虚拟表：

Select months.m, isnull(Sum(Quantity),0) as Q 
from tablename right join 
(VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12)) 
AS months(m)
on months.m=Month(tablename.date)
Group By months.m

Here is a fiddle

Answer 2

这是一般的想法。关键是要创建一个列出所需月份的表，然后使用外部联接附加实际数据。

with months(mon) as (
    select  1 union all select  2 union all select  3 union all
    select  4 union all select  5 union all select  6 union all
    select  7 union all select  8 union all select  9 union all
    select 10 union all select 11 union all select 12
)
select m.mon, coalesce(sum(quantity), 0) as quantity
from months m left outer join <T> t on month(t.date) = m.mon
group by m.mon

如果从1月到12月需要超过一年的数据或者不喜欢这种方法，有很多方法可以创建月份列表。

Answer 3

With Months as
(
  SELECT 1 AS MNTH
  UNION ALL
  SELECT MNTH+1 FROM Months WHERE MNTH<12
)

SELECT MONTH(MNTH),SUM(QUANTITY) 
FROM Months M LEFT JOIN TABLENAME T ON M.MNTH = MONTH(T.DATE)
GROUP BY MONTH(MNTH)

获取每月所有交易的总和，包括没有交易的月份

3 个答案: