我无法使该查询与 SUM 函数一起使用

发布于 2024-08-29 20:04:31 字数 536 浏览 6 评论 0原文

此查询给出错误：

select ep, 
  case
    when ob is null and b2b_ob is null then 'a'
    when ob is not null or b2b_ob is not null then 'b'
    else null
  end as type,
  sum(b2b_d + b2b_t - b2b_i) as sales
from table
where ...
group by ep, type

错误：ORA-00904：“TYPE”：无效标识符

当我使用 group by ep 运行它时，错误消息变为：

ORA-00979：不是 GROUP BY 表达式

整个如果我删除行 sum(b2b_d+b2b_t-b2b_i) as sales 和 group by ... ，查询工作正常，所以问题应该与 SUM 和 GROUP BY 有关功能。我怎样才能做到这一点？预先感谢您的帮助。

原文

This query gives an error:

select ep, 
  case
    when ob is null and b2b_ob is null then 'a'
    when ob is not null or b2b_ob is not null then 'b'
    else null
  end as type,
  sum(b2b_d + b2b_t - b2b_i) as sales
from table
where ...
group by ep, type

Error: ORA-00904: "TYPE": invalid identifier

When I run it with group by ep, the error message becomes:

ORA-00979: not a GROUP BY expression

The whole query works OK if I remove the lines sum(b2b_d+b2b_t-b2b_i) as sales and group by ..., so the problem should be related to SUM and GROUP BY functions. How can I make this work? Thanks in advance for your help.

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与风相奔跑 2024-09-05 20:04:31

不幸的是，SQL 不允许您在 GROUP BY 子句中使用列别名，因此您必须像这样重复整个 CASE：

select ep, 
  case
    when ob is null and b2b_ob is null then 'a'
    when ob is not null or b2b_ob is not null then 'b'
    else null
  end as type,
  sum(b2b_d + b2b_t - b2b_i) as sales
from table
where ...
group by ep,
  case
    when ob is null and b2b_ob is null then 'a'
    when ob is not null or b2b_ob is not null then 'b'
    else null
  end

或使用像这样的内联视图：

select ep, 
  type,
  sum(b2b_d + b2b_t - b2b_i) as sales
from
( select ep, 
    case
      when ob is null and b2b_ob is null then 'a'
      when ob is not null or b2b_ob is not null then 'b'
      else null
    end as type,
    b2b_d,
    b2b_t,
    b2b_i
  from table
  where ...
)
group by ep, type

Unfortunately SQL doesn't allow you to use the column aliases in the GROUP BY clause, so you either have to repeat the entire CASE there like this:

select ep, 
  case
    when ob is null and b2b_ob is null then 'a'
    when ob is not null or b2b_ob is not null then 'b'
    else null
  end as type,
  sum(b2b_d + b2b_t - b2b_i) as sales
from table
where ...
group by ep,
  case
    when ob is null and b2b_ob is null then 'a'
    when ob is not null or b2b_ob is not null then 'b'
    else null
  end

or use an in-line view like this:

select ep, 
  type,
  sum(b2b_d + b2b_t - b2b_i) as sales
from
( select ep, 
    case
      when ob is null and b2b_ob is null then 'a'
      when ob is not null or b2b_ob is not null then 'b'
      else null
    end as type,
    b2b_d,
    b2b_t,
    b2b_i
  from table
  where ...
)
group by ep, type

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