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-- Specific order clause
-- In PostgreSQL can be used CASE ... WHEN in order clause:

ORDER BY
   CASE field_to_order
      WHEN 'value1' THEN 1
      WHEN 'value2' THEN 2
      WHEN 'value3' THEN 3
      ELSE 4 
   END, 
   other_field_to_order
   

-- In MySQL can be used also FIELD() function