text: SELECT COALESCE(1);
  
  SELECT COALESCE(1) AS "number";
  
  SELECT COALESCE(null, 1) AS "number";
  
  SELECT COALESCE(null, null, 1) AS "number";
  
  SELECT COALESCE(null, 10, 1) AS "number";
  
  SELECT COALESCE(email, 'Email is not provided!') from person;
  