MySQL 5.0.0 [2003] vs. MySQL 5.6 [2013] from a SQL and SQL/PSM developer viewpoint

[Lukas Lehner]

Hi

Are there big changes between MySQL 5.0.0 vs. MySQL 5.6? I am only
interested in developer changes (not admin)
Can I use development books for MySQL 5.0.0 [2003] and use the code an
recent MariaDB and MySQL releases?