118 lines
3.5 KiB
MySQL
118 lines
3.5 KiB
MySQL
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-- ==========================================
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-- 题目格式修复 - 逐步执行
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-- 请按照注释一步一步执行，不要一次性全部执行
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-- ==========================================
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-- ==========================================
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-- 第1步：查看最近的考试（找到要修复的考试ID）
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-- ==========================================
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SELECT id, exam_name, create_time
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FROM exam
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ORDER BY id DESC
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LIMIT 10;
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-- 执行后，找到你要修复的考试ID，记下来
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-- 例如：id = 14
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-- ==========================================
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-- 第2步：查看该考试的题目（检查是否有问题）
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-- ==========================================
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-- 将下面的 14 替换成你的考试ID
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SELECT
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id,
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question_type,
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question_content,
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LEFT(options, 100) as options_preview,
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correct_answer
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FROM question
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WHERE exam_id = 14
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ORDER BY id;
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-- 如果看到 options 中有 "A. "、"B. " 这样的前缀，说明需要修复
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-- ==========================================
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-- 第3步：备份数据（必须执行！）
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-- ==========================================
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CREATE TABLE question_backup_20251205 AS
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SELECT * FROM question;
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-- 验证备份是否成功
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SELECT COUNT(*) as backup_count FROM question_backup_20251205;
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-- ==========================================
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-- 第4步：修复题目（核心步骤）
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-- ==========================================
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-- 将下面的 14 替换成你的考试ID
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UPDATE question
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SET
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options = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
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options,
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'"A. ', '"'),
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'"B. ', '"'),
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'"C. ', '"'),
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'"D. ', '"'),
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'"E. ', '"'),
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'"F. ', '"'),
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correct_answer = CASE
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WHEN correct_answer LIKE 'A. %' THEN 'A'
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WHEN correct_answer LIKE 'B. %' THEN 'B'
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WHEN correct_answer LIKE 'C. %' THEN 'C'
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WHEN correct_answer LIKE 'D. %' THEN 'D'
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WHEN correct_answer LIKE 'E. %' THEN 'E'
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WHEN correct_answer LIKE 'F. %' THEN 'F'
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ELSE correct_answer
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END
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WHERE exam_id = 14
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AND question_type IN ('single', 'multiple');
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-- ==========================================
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-- 第5步：验证修复结果
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-- ==========================================
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-- 将下面的 14 替换成你的考试ID
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SELECT
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id,
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question_content,
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options,
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correct_answer
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FROM question
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WHERE exam_id = 14
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ORDER BY id;
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-- 检查结果：
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-- options 应该是: ["选项内容1","选项内容2"] ✅
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-- correct_answer 应该是: A ✅
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-- ==========================================
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-- 第6步：检查学生答案（如果有人已经做过题）
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-- ==========================================
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-- 将下面的 14 替换成你的考试ID
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SELECT
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sa.id,
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sa.student_id,
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sa.question_id,
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sa.student_answer,
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q.correct_answer
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FROM student_answer sa
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JOIN question q ON sa.question_id = q.id
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WHERE sa.exam_id = 14
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ORDER BY sa.student_id, sa.question_id;
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-- 如果 student_answer 也是 "A. 选项内容" 格式，执行下面的修复：
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-- UPDATE student_answer
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-- SET student_answer = CASE
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-- WHEN student_answer LIKE 'A. %' THEN 'A'
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-- WHEN student_answer LIKE 'B. %' THEN 'B'
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-- WHEN student_answer LIKE 'C. %' THEN 'C'
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-- WHEN student_answer LIKE 'D. %' THEN 'D'
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-- ELSE student_answer
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-- END
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-- WHERE exam_id = 14;
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-- ==========================================
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-- 完成！
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-- ==========================================
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-- 如果一切正常，修复完成
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-- 如果出现问题，可以从备份恢复：
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-- DELETE FROM question WHERE exam_id = 14;
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-- INSERT INTO question SELECT * FROM question_backup_20251205 WHERE exam_id = 14;
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