Getting rid of old SQL statements
Re-doing all the queries
Redoing Python examples
Adding comments to SQL file
Revised first section of database lecture
Fixing formatting of table display
Another section of the database writeup
Another section of databases
One more section on databases
More on databases
Aggregation functions (decided to put grouping in a separate section)
Grouping in aggregation
Roughing up another couple of sections
Trying to finish off discussion of databases
Removing tabs
Inserting timings