Sql 为什么赢了';这个查询不能正常工作吗?
我的Sql 为什么赢了';这个查询不能正常工作吗?,sql,sql-server,left-join,right-join,Sql,Sql Server,Left Join,Right Join,我的MasterSales表如下所示 SalesDate | Category | Total ----------------------------- 1/1/2000 01 100 1/1/2000 02 110 1/2/2000 01 80 1/2/2000 03 20 我的Category表如下所示 SalesDate | Category | Total --------------
MasterSales
表如下所示
SalesDate | Category | Total
-----------------------------
1/1/2000 01 100
1/1/2000 02 110
1/2/2000 01 80
1/2/2000 03 20
我的Category
表如下所示
SalesDate | Category | Total
-----------------------------
1/1/2000 01 100
1/1/2000 02 110
1/2/2000 01 80
1/2/2000 03 20
我的查询如下所示:
SELECT m.SalesDate, c.Name, SUM(ISNULL(m.Total,0)) AS TotalSales
FROM MasterSales m
LEFT JOIN Category c ON c.ID = m.Category
WHERE m.SalesDate BETWEEN '1/1/2000' AND '1/2/2000'
SalesDate | Name | TotalSales
------------------------------
1/1/2000 A 100
1/1/2000 B 110
1/1/2000 C 0
1/1/2000 D 0
1/2/2000 A 80
1/2/2000 B 0
1/2/2000 C 20
1/2/2000 D 0
我想要的结果如下:
SELECT m.SalesDate, c.Name, SUM(ISNULL(m.Total,0)) AS TotalSales
FROM MasterSales m
LEFT JOIN Category c ON c.ID = m.Category
WHERE m.SalesDate BETWEEN '1/1/2000' AND '1/2/2000'
SalesDate | Name | TotalSales
------------------------------
1/1/2000 A 100
1/1/2000 B 110
1/1/2000 C 0
1/1/2000 D 0
1/2/2000 A 80
1/2/2000 B 0
1/2/2000 C 20
1/2/2000 D 0
但我得到的结果是:
SalesDate | Name | TotalSales
------------------------------
1/1/2000 A 100
1/1/2000 B 110
1/2/2000 A 80
1/2/2000 C 20
我已经尝试使用RIGHT JOIN
而不是LEFT JOIN
,并在FROM
子句上切换表,但结果仍然相同。有人能帮我解释一下为什么它不能正常工作吗
注意:我正在使用SQLServer2005(如果有必要的话)
在条件之间添加日期
我相信有更好的方法可以做到这一点
欢呼声已更新:更改了使用 我建议您创建一个加法表
;WITH control_table AS (
SELECT DISTINCT SalesDate, Name
FROM MasterSales ms
CROSS JOIN Category c
)
SELECT d.SalesDate,
c.name,
COALESCE(sum(m.total),0) totalsales
FROM control_table d
LEFT OUTER JOIN Category c
ON d.Name = c.name
LEFT OUTER JOIN MasterSales m
ON (c.id = m.category
AND d.SalesDate = m.salesdate)
WHERE d.SalesDate BETWEEN '1/1/2000'
AND '1/2/2000'
GROUP BY
d.SalesDate,
c.name
ORDER BY
d.SalesDate,
c.name;
试试这个。这涵盖您拥有MasterSales的所有日期。换句话说,这将填补当天缺少的类别。但是,如果要填写缺失的日期,则需要创建一个日期控制表。。查看日期表的
;with control_table as (
select distinct SalesDate, ID
from MasterSales ms
cross join Category c
where ms.SalesDate between '1/1/2000' AND '1/2/2000'
)
select ct.SalesDate, c.Name as Category, coalesce(sum(ms.Total),0) as Total
from control_table ct
inner join Category c
on ct.ID = c.ID
left join MasterSales ms
on ct.SalesDate = ms.SalesDate
and ct.ID = ms.Category
group by ct.SalesDate, c.Name
order by ct.SalesDate asc, c.Name asc
这是我的答案
WITH MasterSales (SalesDate, Category, Total) AS (
SELECT '1/1/2000','01',100
UNION SELECT '1/1/2000','02',110
UNION SELECT '1/2/2000','01',80
UNION SELECT '1/2/2000','03',20
), Category (ID, Name) AS (
SELECT '01','A'
UNION SELECT '02','B'
UNION SELECT '03','C'
UNION SELECT '04','D'
), getDates AS (
SELECT DISTINCT SalesDate
FROM MasterSales
WHERE SalesDate BETWEEN '1/1/2000' AND '1/2/2000'
)
SELECT gD.SalesDate, C.Name, SUM(ISNULL(MS.Total,0)) AS TotalSales
FROM getDates AS gD
CROSS JOIN Category AS C
LEFT JOIN MasterSales AS MS
ON MS.Category = C.ID
AND MS.SalesDate = gD.SalesDate
GROUP BY gD.SalesDate, C.Name
最后,你的问题解决了。使用此查询:
SELECT AAA.SalesDate,AAA.Name,ISNULL(BBB.TotalSales,0) as TotalSales
FROM (
(SELECT m.SalesDate, c.Name
FROM MasterSales m,Category c
WHERE m.SalesDate BETWEEN '1/1/2000' AND '1/2/2000'
GROUP BY m.SalesDate,c.Name) AAA
LEFT JOIN
(SELECT m.SalesDate,c.Name, SUM(ISNULL(m.Total,0)) AS TotalSales
FROM MasterSales m,Category c
WHERE m.SalesDate BETWEEN '1/1/2000' AND '1/2/2000'
AND c.ID=m.Category
GROUP BY m.SalesDate,c.Name) BBB
on AAA.SalesDate=BBB.SalesDate AND AAA.Name=BBB.Name)
说明:
查询的第一部分(AAA)选择saledate
和Category
的所有组合
查询的第二部分(BBB)选择saledate
、Category
和TotalSales
然后我们在saledate
和Category
加入这两个网站(AAA和BBB)
很好用!!!。请参阅。在查询的末尾添加
分组依据m.SalesDate,c.Name
,这里的逻辑是什么?您如何获得类别D的销售日期为01012000和01022000?您加入了条件c.ID=m.Category
,因此显然Name=D
不会被选中,因为ID=4
在另一个类别中不可用table@TinTran例如我也试过了,但结果是一样的@SatheeshVariath Variath:我在查询@Gone时使用了Between
:我想通过使用left-join-Category
将显示来自Category
的所有数据,即使在另一个表中没有匹配?顺便问一下,我如何在评论中添加特征线?非常感谢所有试图帮助我的人。我选择Darka的答案是因为它是在ManagementStudio上最容易尝试的答案,而且它工作得非常完美(并不是说其他人都错了,我只是没有全部尝试):为什么是否定的?你试过了吗(创建另一个表并将所有数据插入其中?我不认为这是一个好主意。这几乎比我的好-你忘了SUM
@Alexander,谢谢,SUM补充道,我不认为这对所有这些静态值有什么好处,在这里你看到的是静态的??这只是cte的示例而已;)我怀疑这将失去我或sam yi解决方案的性能