CREATE TABLE Project_Staff (project_id VARCHAR(255)); CREATE TABLE Projects (project_id VARCHAR(255))
How many staff does each project has? List the project id and the number in an ascending order.
    
SQL: SELECT T1.project_id, COUNT(*) FROM Project_Staff AS T1 JOIN Projects AS T2 ON T1.project_id = T2.project_id GROUP BY T1.project_id ORDER BY COUNT(*)