The 'What?' and 'How?' of MySQL modes.
MySQL views and how they differ from tables.
Manoeuvring a MySQL many-to-many relationship.
The 'Left', 'Right' and 'Inner' of MySQL joins.
The 'What?', 'Why?' and 'How?' of one to many relationships in MySQL.
The 'What?', 'Why?' and 'How?' of aggregate functions in MySQL.