根据其他列的约束将列更新为相同的值

Question

我在SQL Server上有这样的表：

code description percentage
123  abc         1
123  oke         0
123  cfd         0
234  kde         2
234  kfc         0
234  kfc         0

如何将每个代码组的所有“0百分比”记录的描述更新为非零百分比记录？例如我追求的结果是：

code description percentage
123  abc         1
123  abc         0
123  abc         0
234  kde         2
234  kde         0
234  kde         0

Answer 1

Update T1 set description = T2.Description from YourTable T1 
inner join 
(    select code, description from yourTable group by code, description
    where percentage <> 0 ) T2 on T1.Code = T2.Code
where T1.Code = 0

<强>被修改 这考虑到每个组仅对另一个描述只有零。

Answer 2

尝试

UPDATE Table  
SET description=(SELECT TOP 1 description 
                 FROM Table t
                 WHERE t.code = Table.code AND percentage<>'0') 
WHERE percentage='0'