Sql 基于完全外部联接结果添加两列中的数据

来自完全外部联接的数据如下所示。我正在尝试构建一个sql查询来执行以下操作

ha和da是相同的值，但任何一个都可以是无值

HC+DC（考虑HC或DC为0时，不）

我的数据是这样的

我期待这样的结果

我正在尝试的问题：

select 
(case when h.ha not in ('None') then h.ha else h.da end) as acc,
(case when h.hc not in ('None') then cast(h.hc as integer) else 0 end 
 + 
case when h.dc not in ('None') then cast(h.dc as integer) else 0 end) as tc 
from 

(select h.acc as ha, hc, d.acc as da, dc from h_data h
full outer join
d_data d
on h.acc = d.acc
) h

---

我得到的

字符串转换为数值失败

不确定我在哪里出错。

我不使用teradata虽然您的示例看起来很正确，但您的想法是正确的，您只处理

null

是错误的。我猜

None

只是数据库浏览器中

null

的一些表示。标准

coalesce

功能IMHO执行此任务：

with h_data as (
  select 'AA' as acc, 1 as hc union
  select 'BB' as acc, 1 as hc union
  select 'EE' as acc, 1 as hc union
  select 'FF' as acc, 2 as hc union
  select 'GG' as acc, 1 as hc union
  select 'HH' as acc, 1 as hc
), d_data as (
  select 'CC' as acc, 1 as dc union
  select 'DD' as acc, 1 as dc union
  select 'EE' as acc, 2 as dc union
  select 'GG' as acc, 4 as dc
)
select coalesce(h.acc, d.acc) as acc,
  coalesce(h.hc, 0) + coalesce(d.dc, 0) as tc
from h_data h
full outer join d_data d on h.acc = d.acc
order by 1

---

我想你把

'None'

和

NULL

混淆了。谢谢@Tomas！我的错。将null错误解释为无。我的查询在检查null时有效。我会尝试合并它看起来很简单