create table tasks(task_id int identity(1,1) primary key,project_id int references projects(project_id),tasks_status int,
team_id int references team(team_id),task text)
create table task_assignment(task_assignment_id int identity(1,1) primary key,team_id int references team(team_id),task_id int references tasks(task_id),mission_status int,
user_id int references users(user_id))
create table task_assignment(task_assignment_id int identity(1,1) primary key,project_id int references projects(project_id),task text,
user_id int references users(user_id),team_id int references team(team_id))