将多行中的多个文本字段分组到一列中

Question

我有以下声明：

SELECT *
FROM 
    (
    SELECT 123 AS id, 123445 AS OrderNr, '775-1x' AS Reference
    UNION ALL
    SELECT 123 AS id, 123445 AS OrderNr, '775-1xx' AS Reference
    UNION ALL
    SELECT 123 AS id, 123445 AS OrderNr, '775-1xxx' AS Reference
    ) AS SUB

结果应该是这样的：

SELECT *
FROM 
    (
    SELECT 123 AS id, 123445 AS OrderNr, '775-1x, 775-1xx, 775-1xxx' AS Reference
    ) AS SUB

Answer 1

你似乎想要 xml 方法和 stuff() 函数 :

with sub as (
       SELECT 123 AS id, 123445 AS OrderNr, '775-1x' AS Reference
       UNION ALL
       SELECT 123 AS id, 123445 AS OrderNr, '775-1xx' AS Reference
       UNION ALL
       SELECT 123 AS id, 123445 AS OrderNr, '775-1xxx' AS Reference
)
select id, OrderNr,
       stuff( (select ','+Reference 
               from sub s1 
               where s1.id = s.id and s1.OrderNr = s.OrderNr
               for xml path('')
              ), 1, 1, ''
            ) as Reference
from sub s
group by id, OrderNr;