CREATE TABLE assignedto (project VARCHAR(255)); CREATE TABLE projects (name VARCHAR(255), code VARCHAR(255), hours INTEGER)
Find the number of scientists involved for the projects that require more than 300 hours.
    
SQL: SELECT COUNT(*), T1.name FROM projects AS T1 JOIN assignedto AS T2 ON T1.code = T2.project WHERE T1.hours > 300 GROUP BY T1.name