Getting top unidentified places from Recogito DB

gistfile1.sql

SELECT 
  -- concat (toponym, toponym_corrected), count(*) 
  coalesce(toponym, toponym_corrected), count(*) 
  
FROM annotations WHERE
 (status = 'NOT_IDENTIFYABLE' OR status = 'NO_SUITABLE_MATCH' OR status = 'AMBIGUOUS' OR status = 'MULTIPLE')
-- GROUP BY concat(toponym, toponym_corrected)
GROUP BY coalesce(toponym, toponym_corrected)
ORDER BY count desc ;

As Hugh Cayless has pointed out:

In any case, the answer is probably the COALESCE() function instead of CONCAT()

Thanks again!