SQLite如何计算相同table的两个变量之间的差异
SQLite How to calculate a difference between two variables of the same table
我是 SQL 的新手，考虑到以下 table。
理想情况下我会得到
this result table (calculation between parentheses for clarification)
感谢您的帮助！
这看起来像 union all 逆透视，然后聚合：
select asset, sum(amount) total_amount
from (
select in_asset as asset, in_amount as amount from mytable
union all
select out_asset, - out_amount from mytable
) t
group by asset
我是 SQL 的新手，考虑到以下 table。
理想情况下我会得到 this result table (calculation between parentheses for clarification) 感谢您的帮助！
这看起来像 union all 逆透视，然后聚合：
select asset, sum(amount) total_amount
from (
select in_asset as asset, in_amount as amount from mytable
union all
select out_asset, - out_amount from mytable
) t
group by asset