mysql if elseif syntax condition -

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if have 2 parameter "parameterx" , "parametery"

and i'll using "parameterx" , "parametery" commend sql snytax

like as

select * test.test  if(parametery!=0)  test.test.'x'=parameterx , test.test.'y'=parametery  else if  test.test.'x'=parameterx  end if

i know this's can't work want know have other way , can work in mysql

or easier (than @diehud's answer):

select * test.test  test.test.'x'=parameterx , (test.test.'y'=parametery or parametery=0)

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