SELECT name FROM projects WHERE hours  >  (SELECT avg(hours) FROM projects)
List the name of all projects that are operated longer than the average working hours of all projects.
[Schema (values) (types)]: | scientist_1 |  Scientists : ssn (text) , name (number) | Projects : code (text) , name (number) , hours (text) | AssignedTo : scientist (text) , project (number);