Sql 如何将值列设置为值行？

我有一个表dbo.tbbuy，如下所示：

我想得到如下结果表：

SQL表表示无序集。您的表没有顺序，所以您可以使用

min（）

和

max（）

：

更通用的方法使用条件聚合：

select name,
       max(case when seqnum = 1 then value end) as value_1,
       max(case when seqnum = 2 then value end) as value_2,
       max(case when seqnum = 3 then value end) as value_3
from (select t.*,
             row_number() over (partition by name order by name) as seqnum
      from t
     ) t
group by name;

---

如果希望值按特定顺序排列，请更改

order by

子句。

是否有已知的数值列？

select name,
       max(case when seqnum = 1 then value end) as value_1,
       max(case when seqnum = 2 then value end) as value_2,
       max(case when seqnum = 3 then value end) as value_3
from (select t.*,
             row_number() over (partition by name order by name) as seqnum
      from t
     ) t
group by name;