For each county, find the name of the county and the number of delegates from that county.
SELECT T1.County_name ,  COUNT(*) FROM county AS T1 JOIN election AS T2 ON T1.County_id  =  T2.District GROUP BY T1.County_id
name of the county refers to County_name; number of delegates from that county is calculated using COUNT(*) from a join between tables county and election based on County_id = District; grouping the results by County_id to get the count per county.