Question

TABLES:

• student(name,points)
• playsin(name->student(name), score)

I’m trying to use:

UPDATE STUDENT
   SET points = points + CONSTANT * (SELECT score 
                                       FROM PLAYSIN 
                                      WHERE playsin.name = student.name);

Answer 1

Try:

UPDATE STUDENT s
   SET points = s.points + CONSTANT * (SELECT p.score 
                                        FROM PLAYSIN p 
                                       WHERE p.name = s.name)

Table aliases are a very good habit to have.