List the names of artists who have released volumes.
select distinct t1.artist from artist as t1 join volume as t2 on t1.artist_id = t2.artist_id
List the information of volumes released by Gorgoroth.
select * from artist as t1 join volume as t2 on t1.artist_id = t2.artist_id where t1.artist = "Gorgoroth"
What are their issue dates?
select t2.issue_date from artist as t1 join volume as t2 on t1.artist_id = t2.artist_id where t1.artist = "Gorgoroth"