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neilfurry

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:

 

SELECT

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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Use the expression instead of its alias in the calculation.

SELECT SUM(invoice - estimate) / SUM(estimate) * 100 as percent

Note SUM(estimate) and not COUNT. Multiplying an average by 100 is not the best way.

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