通过 FOR XML PATH 将主组连接到子组

Question

我可以使用 FOR XML PATH 连接多行以在单行中生成逗号分隔值，如下所示：

TMonth  Location    Degrees
Jan     Tokyo       7.0
Jan     New York    -0.2
Jan     Berlin      -0.9
Jan     London      3.9
Feb     Tokyo       6.9
Feb     New York    0.8
Feb     Berlin      0.6
Feb     London      4.2

SELECT t.Location, STUFF(
(SELECT ',' + convert(varchar(5), s.Degrees)
FROM MonthlyTemps s
WHERE s.Location = t.Location
--FOR XML PATH('')),1,1,'') AS CSV
FOR XML PATH(''), TYPE).value('.', 'VARCHAR(MAX)'),1,1,'') AS CSV
FROM MonthlyTemps AS t
GROUP BY t.Location

结果：

Location     CSV
Berlin     -0.9,0.6
London     3.9,4.2
New York   -0.2,0.8
Tokyo      7.0,6.9

现在，我真的需要这样的结果（即 "main" 组连接到 "subgroup" 的前面）：

CSV
Berlin,-0.9,0.6
London,3.9,4.2
New York,-0.2,0.8
Tokyo,7.0,6.9

我尝试了几个不同的查询都无济于事。我知道它就在那里盯着我看，但我需要一双额外的眼睛来帮助我。如有任何帮助，我们将不胜感激！

Answer 1

使用字符串连接和子查询将两列与 ',' 连接起来。希望这项工作。

select Location + ',' + aa as 'CSV' from 
(
SELECT t.Location, STUFF(
(SELECT ',' + convert(varchar(5), s.Degrees) as aa
FROM MonthlyTemps s
WHERE s.Location = t.Location
--FOR XML PATH('')),1,1,'') AS CSV
FOR XML PATH(''), TYPE).value('.', 'VARCHAR(MAX)'),1,1,'') AS CSV
FROM MonthlyTemps AS t
GROUP BY t.Location
) as temp

通过 FOR XML PATH 将主组连接到子组

Concatenate Main Group to Subgroup via FOR XML PATH

sql

xml

concat

for-xml-path