[firebird-support] Row_Number () over (partition by field1 order by field 2 desc) as ROWNUMBER

[Erik Drescher]

Hey there,

I use Firebird 2.5 and look after a alternative function ti 
use Row_Number () over (partition by field1 order by field 2 desc) as ROWNUMBER
This works great on Firebird 3, but does anybody knows a good alternative?

thanks

erik