利用分析函数ROW_NUMBER实现分组排序

利用分析函数ROW_NUMBER实现分组排序

按照特定的列（a0100)进行分组，按照创建日期（date)更改排序字段的值

select z.a0100,z.i9999,z.createtime,sum(z.cz604)
from
usraz6 z
group by z.a0100,z.i9999,z.createtime
order by  z.a0100,z.i9999

使用Oracle 分析函数，现在组内进行排序，然后再循环更新字段

declare
 
  v_sql_id usraz6%rowtype;
 
begin
 
  for v_sql_id in (select z.a0100,
       z.createtime,
       row_number() over(partition by z.a0100 order by z.createtime asc) seq_number
                   from usraz6 z ) loop
  
    update usraz6 p2
       set p2.i9999 = v_sql_id.seq_number
     where p2.createtime = v_sql_id.createtime;
  
  end loop;
 
end;