Still working on SQL. Not started on PHP yet. The SQL is helping me to spot issues with the interface design. Starting to think like a programmer, not just as a user.
Chose to use INNODB database engine because I can test my schema and queries without needing to learn PHP. The INNODB engine enables you to knit data together using primary and foreign keys. The alternative, the ISAM engine, requires you to maintain referential integrity programmatically.
Since returning to work post-shoulder op, I have spent a very small amount of time on development.