将多行组合成一行

举例来说，我有一张表，其中包含客户在咖啡馆中活动的描述。（比喻实际的表的我的工作）将多行组合成一行

Customer Borrowed Book Ordered Drink Has Company 
1    1  
1        1 
1            Yes 
2        1 
3        1 
3            Yes 
4    1    1 
4        1

我想行这样

Customer Borrowed Book Ordered Drink Has Company 
1    1     1   Yes 
2         1 
3         1   Yes 
4    1     2

我做自联接与聚结结合，但它并没有给我想要的结果。

来源

2016-09-16 Leaf Node

想必你只是想'总和（[借来的书]），SUM（[下令饮料]），MAX（[有公司]）'和组按客户？ – ZLK

@ZLK，是的，有点..但初始表实际上是一个结果集的临时表，我不能通过聚合问题 –

哼。如果不知道原始数据是什么以及为什么会遇到聚合问题，很难提供帮助。注意：当执行总和时，您可能还需要一个'isnull（x，0）'语句。 – ZLK

根据您的评论，初始表是一个临时表，尽量使结果作为CTE结果，然后再做聚集上，像下面的查询。

; WITH cte_1 
     AS 
    ( //your query to return the result set) 
    SELECT customer,sum([borrowed book]) BorrowedBook, 
     sum([ordered drink]) OrderedDrink, 
     max([has company]) HasCompany 
    FROM cte_1 
    GROUP BY Customer

来源

2016-09-16 04:30:27

您可以通过组做到这一点，

select Customer,sum([borrowed book]), sum([ordered drink]), max([has company]) from customeractivity group by Customer

来源

2016-09-16 04:31:00

使用组方：

DECLARE @tblTest as Table(
    Customer INT, 
    BorrowedBook INT, 
    OrderedDrink INT, 
    HasCompany BIt 
) 

INSERT INTO @tblTest VALUES 
(1,1,NULL,NULL) 
,(1,NULL,1,NULL) 
,(1,NULL,NULL,1) 
,(2,NULL,1,NULL) 
,(3,NULL,1,NULL) 
,(3,NULL,NULL,1) 
,(4,1,1,NULL) 
,(4,NULL,1,NULL) 

SELECT 
    Customer, 
    SUM(ISNULL(BorrowedBook,0)) AS BorrowedBook, 
    SUM(ISNULL(OrderedDrink,0)) AS OrderedDrink, 
    CASE MIN(CAST(HasCompany AS INT)) WHEN 1 THEN 'YES' ELSE '' END AS HasCompany 
FROM @tblTest 
GROUP BY Customer

来源

2016-09-16 06:05:35

不知道，为什么你被越来越误差组。

你的合并应该是正确的。请参阅下面的方式

Select customer 
, case when [borrowed] = 0 then NULL else [borrowed] end as [borrowed] 
, case when [ordered] = 0 then NULL else [ordered] end as [ordered] 
, case when [company] = 1 then 'Yes' end as company 
from 
(
    Select customer, 
    coalesce(
    case when (case when borrowed = '' then null else borrowed end) = 1 then 'borrowed' end, 
    case when (case when ordered = '' then null else ordered end) = 1 then 'ordered' end, 
    case when (case when company = '' then null else company end) = 'Yes' then 'company' end 
    ) val 
    from Table 
) main 
PIVOT 
(
    COUNT (val) 
    FOR val IN ([borrowed], [ordered], [company]) 
) piv

OUTPUT：

customer | borrowed | ordered | company 
--------------------------------------- 
1   1   1   Yes 
2   NULL  1   NULL 
3   NULL  1   Yes

来源

2016-09-16 06:13:55 p2k

将多行组合成一行

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