SQL Server 2016：如何获取单行视图

Question

我一直在努力正确表达这个词，但这是我的 dbfiddle

Table:

    Customerkey int NOT NULL PRIMARY KEY,
    processdate date NULL,
    CCcount int NULL,
    CHKcount int NULL,
    SACount int NULL
);

INSERT INTO products 
(Customerkey, processdate, CCcount, CHKCount, SACount) 
VALUES
(101,'20210501', 12,3,5),
(102,'20210203', 1,3,1),
(103,'20190412', 4,0,2)

SELECT  CustomerKey,  processdate,
ProductMix=STUFF  
(  
     (  
       SELECT distinct ',' + str(CCcount)  + ',' + str(CHKCount)   +  ',' + str(SACount)
       FROM products t2 
       WHERE t2.CustomerKey = t1.CustomerKey   
       and t2.processdate = t1.processdate
        ),1,1,''  
)  
FROM products t1  
GROUP BY CustomerKey,  processdate

SELECT CustomerKey, processdate,
concat(
Case when CCcount >' ' then 'CCcount' 
when CHKCount > '' then 'CHKCount'
when SACount > '' then 'SACount'
end, '') as Product_Mix_Expanded
from products

预期输出：

客户密钥	处理日期	Product_Mix	Product_Mix_展开
101	2021-05-01	12,3,5	CCcount、CHKCount、SACount
102	2021-02-03	1,3,1	CCcount、CHKCount、SACount
103	2019-04-12	4,0,2	CCount，SACount

如您所见，我使用了 STUFF，但不确定这是否是正确的方法。我需要以文字格式显示数量和产品组合扩展的产品组合。随时提出您需要更多意见的问题。提前谢谢你。

Answer 1

根据您的示例数据和预期结果，以下方法对您有用吗？

select CustomerKey, ProcessDate, Concat(CCcount,',',CHKcount,',',SACount) Product_Mix, 
    Concat(case when CCcount>0 then 'CCcount' else '' end,', ',
    case when CHKcount>0 then 'CHKcount' else '' end, ', ',
    case when SACount>0 then 'SACount' else '' end) Product_Mix_Expanded
from products

Answer 2

通过 XQuery 的替代方法。

SQL

-- DDL and sample data population, start
DECLARE @tbl TABLE (
    Customerkey int NOT NULL PRIMARY KEY,
    processdate date NULL,
    CCcount int NULL,
    CHKcount int NULL,
    SACount int NULL
);
INSERT INTO @tbl (Customerkey, processdate, CCcount, CHKCount, SACount) VALUES
(101,'20210501', 12,3,5),
(102,'20210203', 1,3,1),
(103,'20190412', 4,0,2);
-- DDL and sample data population, end

SELECT Customerkey, processdate
    , REPLACE(x.query('data(/root/*)').value('text()[1]', 'VARCHAR(100)'), SPACE(1), ',') AS Product_Mix
    , REPLACE(x.query('for $x in /root/*[./text()!="0"]
    return local-name($x)').value('text()[1]', 'VARCHAR(100)'), SPACE(1), ',') AS Product_Mix_Expanded
FROM @tbl
CROSS APPLY (
      SELECT CCcount, CHKCount, SACount
      FOR XML PATH(''), TYPE, ROOT('root')) AS t(x);

输出

+-------------+-------------+-------------+--------------------------+
| Customerkey | processdate | Product_Mix |   Product_Mix_Expanded   |
+-------------+-------------+-------------+--------------------------+
|         101 | 2021-05-01  |      12,3,5 | CCcount,CHKCount,SACount |
|         102 | 2021-02-03  |       1,3,1 | CCcount,CHKCount,SACount |
|         103 | 2019-04-12  |       4,0,2 | CCcount,SACount          |
+-------------+-------------+-------------+--------------------------+

SQL Server 2016：如何获取单行视图

SQL Server 2016: how to get a single row view

sql

sql-server

sql-server-2016