[英]Filed in Mysql calculated from other calculated fields
我寻求一种方法来写这样的东西
select complicated_calculation1 as comp1,
complicated_calculation2 as comp2,
(comp1/comp2) as percent
from table
而不是像这样复杂得多
select complicated_calculation1 as comp1,
complicated_calculation2 as comp2,
(complicated_calculation1/complicated_calculation2) as percent
from table
这可能吗?
不在同一行。
您可以做的是:
SELECT comp1, comp2, (comp1/comp2) as percent FROM(
select complicated_calculation1 as comp1,
complicated_calculation2 as comp2
from table) AS t
no u cann't use this
select complicated_calculation1 as comp1,
complicated_calculation2 as comp2,
(comp1/comp2) as percent
from table
u have to use only this
select complicated_calculation1 as comp1,
complicated_calculation2 as comp2,
(complicated_calculation1/complicated_calculation2) as percent
from table
because rantime calculation can not be applied on Alis field name
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