Which different county has the most number of closed schools? Please provide the name of each school as well as the closure date.
Closure date and closed date are synonyms; 'Closed' was mentioned in schools.StatusType.
SELECT DISTINCT County, School, ClosedDate FROM schools WHERE County = ( SELECT County FROM schools WHERE StatusType = 'Closed' GROUP BY County ORDER BY COUNT(School) DESC LIMIT 1 ) AND StatusType = 'Closed' AND school IS NOT NULL