为每种ID语言添加“ CustomDescription”列的计算查询

Question

请您帮我弄清楚如何为我在表上添加的每个idLanguage创建一个临时计算字段（customDescription2，customDescription3…）。下表中显示的数据来自1表。

Answer 1

如果您知道语言ID，则可以使用条件聚合：

select substitute, barcode,
       max(case when idlanguage = 1 then customDescription end) as customDescription1,
       max(case when idlanguage = 2 then customDescription end) as customDescription2,
       max(case when idlanguage = 3 then customDescription end) as customDescription3,
       max(case when idlanguage = 4 then customDescription end) as customDescription4
from t
group by substitute, barcode;