141 lines
4.0 KiB
MySQL
141 lines
4.0 KiB
MySQL
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-- ========================================
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-- 数据清理：删除孤儿学生数据
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-- ========================================
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-- 问题：删除用户时没有级联删除学生相关数据
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-- 导致：课程分配统计的学生数 ≠ 用户管理的学生数
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-- 解决：清理所有没有对应用户的学生数据
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-- ========================================
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-- 1. 查询孤儿学生数据（有学生记录但用户已删除）
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SELECT
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s.student_id,
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s.student_name,
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s.user_id,
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'用户已删除' AS status
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL;
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-- 统计孤儿数据数量
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SELECT COUNT(*) AS orphan_count
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL;
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-- ========================================
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-- 清理步骤（按依赖顺序删除）
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-- ========================================
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-- 第1步：删除学习记录详情（study_learning_detail）
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DELETE FROM study_learning_detail
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WHERE student_id IN (
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SELECT s.student_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- 第2步：删除学习记录（study_learning_record）
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DELETE FROM study_learning_record
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WHERE student_id IN (
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SELECT s.student_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- 第3步：删除课程分配（study_course_assignment）
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DELETE FROM study_course_assignment
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WHERE student_id IN (
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SELECT s.student_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- 第4步：删除学生班级关联（study_student_class）
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DELETE FROM study_student_class
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WHERE student_id IN (
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SELECT s.student_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- 第5步：删除考试记录（study_exam_record）
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DELETE FROM study_exam_record
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WHERE student_id IN (
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SELECT s.student_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- 第6步：删除答题记录（study_student_answer）
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DELETE FROM study_student_answer
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WHERE student_id IN (
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SELECT s.student_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- 第7步：删除学生变更记录（study_student_change_log）
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DELETE FROM study_student_change_log
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WHERE student_id IN (
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SELECT s.student_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- 第8步：删除语音评测记录（study_voice_evaluation）如果有
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DELETE FROM study_voice_evaluation
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WHERE student_id IN (
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SELECT s.student_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- 第9步：最后删除学生信息（study_student）
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DELETE FROM study_student
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WHERE user_id IN (
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SELECT s.user_id
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL
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);
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-- ========================================
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-- 验证清理结果
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-- ========================================
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-- 再次查询孤儿学生（应该为空）
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SELECT COUNT(*) AS remaining_orphans
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FROM study_student s
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LEFT JOIN sys_user u ON s.user_id = u.user_id
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WHERE u.user_id IS NULL;
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-- 查询当前学生数量
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SELECT
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'用户表学生数' AS type,
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COUNT(*) AS count
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FROM sys_user
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WHERE user_type = 'student' OR user_type = '02'
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UNION ALL
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SELECT
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'学生表数量' AS type,
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COUNT(*) AS count
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FROM study_student;
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-- ========================================
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-- 使用说明
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-- ========================================
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-- 1. 先执行前面的SELECT查询，确认要删除的数据
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-- 2. 备份数据库（重要！）
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-- 3. 按顺序执行DELETE语句
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-- 4. 执行验证查询，确认清理成功
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-- 5. 重新编译并部署后端（包含级联删除修复）
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-- ========================================
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