SQL如何显示一个月的“0"值，如果该月的表中不存在数据 [英] SQL How to show '0' value for a month, if no data exists in the table for that month

问题描述

首先我的结果是这样的:

First of all my result looks like this:

<头>

KONTONR	月	SELSKAPSKODE	BELOP
459611	1	BAGA	156000
459611	2	BAGA	73000
459611	4	BAGA	217000
459611	5	BAGA	136000
459611	1	CIVO	45896
459611	3	CIVO	32498
459611	4	CIVO	9841
330096	1	BAGA	42347
330096	3	BAGA	3695

我正在尝试显示多个帐户上 2 个月的预订，每个帐户 (KONTONR) 有几个代码 (SELSKAPSKODE) 用于记录预订(预订总和为 BELOP).我想概述每个帐户 (KONTONR) 每个月每个代码 (SELSKAPSKODE) 的预订总额 (BELOP).我的问题是，如果没有使用该代码进行预订，则该代码在一个月内不会显示.有没有办法来解决这个问题?我理解为什么代码不显示，因为它们根本不在我查询的表中.我怀疑解决方案是制作一个假"表，然后我将其与另一个"表连接(左外连接?).
我只是无法让它工作，我对 SQL 很陌生.有人可以帮忙吗?
我的查询看起来像这样(如果有意义，我只插入了嵌套"查询来设置连接?！):

I'm trying to show month 2 month bookings on several accounts, per account (KONTONR) there are several codes (SELSKAPSKODE) on which bookings are recorded (the sum of the bookings as BELOP). I would like to give an overview of the sum of the bookings (BELOP) per account (KONTONR) per month per code (SELSKAPSKODE). My problem is the codes don't show in a month if no bookings are made on that code. Is there a way to fix this? I understand why the codes don't show, since they're simply not in the table I'm querying. And I suspect that the solution is in making a 'fake' table which I then join (left outer join?) with 'another' table.
I just can't get it to work, I'm pretty new to SQL. Can someone please help?
My query looks like this (I only inserted the 'nested' query to make a set-up for a join, if this makes sense?!):

SELECT TOP (100) PERCENT KONTONR, Month, SELSKAPSKODE, BELOP
FROM (
    SELECT SELSKAPSKODE, KONTONR, SKIPS_KODE, MONTH(POSTDATO) AS Month, SUM(BELOP) AS BELOP
    FROM dbo.T99_DETALJ
    WHERE (POSTDATO >= '2012-01-01') AND (BILAGSART = 0 OR BILAGSART = 2)
    GROUP BY SELSKAPSKODE, KONTONR, SKIPS_KODE, MONTH(POSTDATO)
    ) AS T99_summary
GROUP BY KONTONR, SELSKAPSKODE, Month, BELOP
ORDER BY KONTONR, SELSKAPSKODE, Month

最后，我想填写"缺失的月份(请参阅开头的表格)，例如帐户 (KONTONR) 459611 第 3 个月是缺失".我想显示第 3 个月，预订总和 (BELOP) 为0".非常感谢任何帮助，提前致谢！

So concluding I would like to 'fill up' the missing months (see table at the start), for instance for account (KONTONR) 459611 month 3 is 'missing'. I would like to show month 3, with the sum of the bookings (BELOP) as '0'. Any help is greatly appreciated, thanks in advance!

推荐答案

您可以查询值为 1-12 的表并左外连接您的结果.

You can query a table with the values 1-12 and left outer join your result.

以下示例使用表变量代替查询和 CTE 来构建包含数字的表.

Here is a sample using a table variable instead of your query and a CTE to build a table with numbers.

declare @T table
(
  Month int
)

insert into @T values(1)
insert into @T values(1)
insert into @T values(1)
insert into @T values(3)
insert into @T values(3)

;with Months(Month) as
(
  select 1
  union all
  select Month + 1
  from Months
  where Month < 12
)
select M.Month,
       count(T.Month) Count,
       isnull(sum(T.Month), 0) Sum
from Months as M
  left outer join @T as T
    on M.Month = T.Month
group by M.Month

结果:

Month       Count       Sum
----------- ----------- -----------
1           3           3
2           0           0
3           2           6
4           0           0
5           0           0
6           0           0
7           0           0
8           0           0
9           0           0
10          0           0
11          0           0
12          0           0

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