moodle/question
Tim Hunt 4267fc5272 MDL-32727 quiz upgrade: sort out potential unique key violations
... before trying to create the unique index that should be there.
The violations may come from old buggy code.

We do two things.
1. First we delete all previews.
2. Then, if there are still problems, we renumber attempts to eliminate
the duplicates.
2012-05-15 15:23:53 +01:00
..
2012-04-10 15:27:11 +02:00