sql - Missing keyword from SELECT CASE -


i unsure wrong sequence of case statements. have looked online , syntax seems correct getting error missing keyword. appreciated!

case  when = '1'          when sequence_number = 5 9          when sequence_number = 6 9          end  when = '2'        when sequence_number = 5 9        when sequence_number = 6 9        end   when = '3'         when sequence_number =7 9         when sequence_number =8 9         end else t.number end number

the simplest option seem be:

 case     when (a in (1,2) , sequence_number in (5,6)) or         (a in (3  ) , sequence_number in (7,8))    9    else t.number  end

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