Database role in SQL Server 2014

Question

I've a question about db_owner role in SQL Server. Does it mean if the users account in this role, he/she can do anythings on that database? Does db_owner role automatically included rights of other roles such as Db_datareader , Db_datawriter , Db_ddladmin , Db_securityadmin and so on

Answer 1

For all your questions,the answer is yes..Taken from BOL ..

Members of the db_owner fixed database role can perform all configuration and maintenance activities on the database