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MDL-31829 question engine SQL typo breaks some regrades.
Also, some MySQL-only code had not been updated. This problem only affected a small minority of question attempts, like this: 1. Suppose you have a shortanswer question with correct answer 'Toad' and some hints. 2. Suppose a student attempts this using the interactive behaviour and on the first try responds 'Frog', and on the second try responds 'Toad'. 3. Then suppose the teacher edits the question to make 'Frog' correct. 4. Then, when the quiz is regraded, the question_attempt_step for the second try will need to be deleted. That is where the buggy code was.
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