ALTER TABLE Question ALTER COLUMN title varchar(3072);
ALTER TABLE Question ALTER COLUMN answer text;
ALTER TABLE ExamQuestion ALTER COLUMN answerChoosen text;
UPDATE AnswerSheet SET examPaperStatus = '已评分' WHERE endTime is not null and examPaperStatus is null;
UPDATE AnswerSheet SET examPaperStatus = '未交卷' WHERE endTime is null and examPaperStatus is null;