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Help MySQL percentage getting to work


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hi there,


can i ask some help please.


i need to get the addon percentage on my database... add on is being computed based on the difference between an invoice and estimate.


my query goes like this:



COUNT(estimate) as est,

SUM(invoice-estimate) as addons,

SUM(addons / est) * 100 as Percentage

FROM tblestimates


What is the best way to do this? i know that i cant use aliases on the computation i made.


Thank you

Edited by neilfurry
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