as well as for first or all attempts.
This commit drops a database table and then recreates it. This is in
order to be able to have some new columns in the table be NOT NULL with
no default value, which would not be possible if I added fields to an
existing table.
The quiz_statistics table is used for caching calculated values only
and thus we can safely drop it and recreate it.
to question bank
- move cron to clean up old cache records move code and
rename classes
- further review of the quiz reports statistics code
- starting to separate calculations of quiz stats, question stats and
response analysis
- introduce hashcode db field for cached stats convert
- code to use qubaids hashcode for caches
We just drop the old tables (including previous upgrade steps) and
re-create the new ones, because these tables just cache calculated
statistics. No important data is stored in them.
John Beedell