Database: concert_singer

Question: List singer names and number of concerts for each singer.
SQL: SELECT T2.name ,  count(*) FROM singer_in_concert AS T1 JOIN singer AS T2 ON T1.singer_id  =  T2.singer_id GROUP BY T2.singer_id

Question: List all singer names in concerts in year 2014.
SQL: SELECT T2.name FROM singer_in_concert AS T1 JOIN singer AS T2 ON T1.singer_id  =  T2.singer_id JOIN concert AS T3 ON T1.concert_id  =  T3.concert_id WHERE T3.year  =  2014

Question: what is the name and nation of the singer who have a song having 'Hey' in its name?
SQL: SELECT name ,  country FROM singer WHERE song_name LIKE '%Hey%'

Question: Find the name and location of the stadiums which some concerts happened in the years of both 2014 and 2015.
SQL: SELECT T2.name ,  T2.location FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id  =  T2.stadium_id WHERE T1.Year  =  2014 INTERSECT SELECT T2.name ,  T2.location FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id  =  T2.stadium_id WHERE T1.Year  =  2015