php - 我想从具有一列名为“UP”的 5 个表中求和

Question

我有 5 个表（bepd、tirpd、elpd、frpd、kopd）与名为“Up”的同一列，我想从所有表中得出 Up 的总和并在 php 代码中显示它。谁能帮我 ？

Answer 1

select  sum(SumUp)
from    (
        select  sum(up) as SumUp
        from    Table1 
        union all
        select  sum(up)
        from    Table2
        union all
        select  sum(up)
        from    Table3
        union all
        ...
        ) SubQueryAlias