loop parameter

i am new migrate from mySQL in visual studio

when i set parameter in SELECT statement

SELECT @sp:= Sum(dt.a) AS spk, @tby:=Sum(dt.b) AS tabs, IF(@sp = 0, 0, @tbyr / @sp) AS px, @py:=Sum(dt.vt) AS py, @bbt:=py*py-px AS bBt

this result is null in column px and bbt, but running well when using mySQL

what must i do


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