Informal Poll: What are the most important areas for you to learn related to MySQL?

I did a short informal poll to see what are the most important areas for you to learn related to MySQL. These numbers were very consistent with the last class I taught in terms of new students priorities.
17 (68%) Performance Tuning
13 (52%) Management Best Practices
13 (52%) Backup and Recovery
9 (36%) High Availability
5 (20%) PHP
4 (16%) Stored Procedures
4 (16%) Linux
0 (0%) Apache or JBoss