Question

我试图在Oracle上使用此代码并且错误输出。分区＆＃39;声明突出显示。我该如何解决这个问题？

select 
case when b.c_1 = 1 then b.workkey else null end workkey,
b.total_value total_value,
b.namekey namekey
from (select distinct workkey,total_value,namekey, 
      rownum() over (partition by workkey) as c_1 
      from report.arturdup
     ) b

Answer 1

正确的功能是row_number()：

select (case when b.c_1 = 1 then b.workkey end) as workkey,
       b.total_value as total_value,
       b.namekey as namekey
from (select distinct workkey, total_value, namekey,
             row_number() over (partition by workkey order by b.workkey) as c_1
      from report.arturdup
     ) b;

注意：您不需要子查询：

select (case when row_number() over (partition by workkey order by workkey) = 1
             then b.workkey
        end) as workkey,
       b.total_value,
       b.namekey
from report.arturdup;

注意：

在大多数数据库中，order by是必需的（有些不是，但我总是使用order by。
else NULL是多余的。
您无需指定已经是列名称的列别名。
我总是使用as作为列别名。

Oracle SQL＆＃39; OVER＆＃39;分区错误

1 个答案: