Question

您好我必须在mssql db中的一个表中联合几行。

update rashod
  set kol = (select sum(r.kol) from rashod r inner join rashod r1 on r1.k_tovar=r.k_tovar      
  where r.idnak = 2935691 and r.k_tovar=r1.k_tovar), 
    summa = (select sum(r2.summa) from rashod r2 inner join rashod r3 on r2.k_tovar=r3.k_tovar where r2.idnak = 2935691 and r2.k_tovar=r3.k_tovar)

这是一个正确的查询吗？

在表格“rashod”中，几行可以拥有相同的k_tovar和idnak。如果是的话 - ＆gt;我们统一这些行。列kol =sum(kol)，列summa=sum(summa)。这个新行保存在db中，应删除所有旧行。请帮助。

Answer 1

请试试这个

update rashod set kol= data.kol_sum,summa=data.sum_summa
 from 
 (
    select sum(r.kol) as kol_sum,sum(r2.summa)as sum_summa,r.k_tovar as k_tovar  from rashod r inner join rashod r1 on r1.k_tovar=r.k_tovar      
    where r.idnak = 2935691
     group by r.k_tovar,r1.k_tovar
)data where rashod.k_tovar=data.k_tovar

Answer 2

这是有效的

update rashod set kol= data.kol_sum,summa=data.sum_summa
 from 
 (
    select sum(r.kol) as kol_sum,sum(r.summa)as sum_summa,r.k_tovar as k_tovar  from rashod r   
    where r.idnak = 2935691
     group by r.k_tovar
)data where rashod.k_tovar=data.k_tovar and rashod.idnak = 2935691

SQL更新奇怪的查询

2 个答案: