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select
  case cast(rand() * 4 as integer)
     when 0 then '0'
     when 1 then '1'
     when 2 then '2'
     when 3 then '3'
     when 4 then '4'
     else 'ÄÁ ÎÕ ÎÁÈ'
  end
from RDB$RELATIONS


fb 2.1.0.16074