Database: california_schools (difficulty: simple)
Question: Which different county has the most number of Merged schools? Please provide the name of each school as well as the closure date.
SQL: SELECT DISTINCT County, School, ClosedDate FROM schools WHERE County = ( SELECT County FROM schools WHERE StatusType = 'Merged' GROUP BY County ORDER BY COUNT(School) DESC LIMIT 1 ) AND StatusType = 'Merged' AND school IS NOT NULL