mysql - If else on WHERE clause -

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i've query:

select  `id` ,  `naam`   `klanten`  ( `email`  '%@domain.nl%' or  `email2`  '%@domain.nl%' )

but want this:

select  `id` ,  `naam`   `klanten`  if(`email` > 0, `email`  '%@domain.nl%' ,  `email2`  '%@domain.nl%' )

how check if email exist? want use email , if field empty want use email2. how accomplish this?

if used select field, like clause placed after it:

select  `id` ,  `naam`   `klanten`  if(`email` != '', `email`, `email2`)  '%@domain.nl%'

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