Create Views返回join中的所有列

Question

我收到的错误可以简化为：

create view test as
select *
from 
  firsttable f
inner 
join  ( select *
    , row_number() as rownum
    from 
      secondtable s
   ) as t

on    f.id = t.id

错误是派生表t的内容，第一个索引没有名称。我做错了什么？

Answer 1

使用它。请注意s.的选择查询中*之前的secondtable。

同样使用列名及其相应的别名，就好像两个表都是2个具有相同名称的列一样，那么你可能会得到错误。

create view test as
select f.id as id1,f.col1 as col1,f.col2 as col2 ......
       t.id as id2,t.col1 as tcol1,t.col2 as tcol2 .....
from 
  firsttable f
inner 
join  ( select s.*
    , row_number() as rownum
    from 
      secondtable s
   ) as t

on    f.id = t.id