Question

鉴于以下表格：

材料

+-----------------+-----------------+
|Material         |Name             |
+-----------------------------------+
|00000001         |Material Number 1|
|00000002         |Material Number 2|
+-----------------+-----------------+

材料名称

+---------+---------+-------------+
|Material |Language |Name         |
+---------------------------------+
|00000001 |DE       |Mat. Nummer 1|
|00000001 |FR       |Matérial 1   |
|00000002 |SP       |Mat. 1       |
+---------+---------+-------------+

如何创建将返回数据的SQL语句（MSSQL 2005 Flavor），如下所示：

+---------+---------------+---------------+----------+----------+
|Material |Name_EN        |Name_DE        |Name_FR   |Name_SP   |
+---------------------------------------------------------------+
|00000001 |Material Number|1 Mat. Nummer 1|Matérial 1|NULL      |
|00000002 |Material Number|2 NULL         |NULL      |Mat. 1    |
+---------+---------------+---------------+----------+----------+

我使用CASE WHEN，IS NOT NULL等尝试了几种方法。但它总是导致单行只填充一列，即使有更多名称可用于材料。

我能做些什么来实现这个目标？

Answer 1

您可以使用join和条件聚合：

执行此操作

select m.materialid, m.name as Name_EN,
       max(case when nm.language = 'DE' then nm.name end) as Name_DE,
       max(case when nm.language = 'FR' then nm.name end) as Name_FR,
       max(case when nm.language = 'SP' then nm.name end) as Name_SP
from materials m join
     materialnames nm
     on m.materialid = nm.materialid
group by m.materialid, m.name;

在一行中加入特定于语言的名称

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