161 lines
4.0 KiB
SQL
161 lines
4.0 KiB
SQL
-- ========================================
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-- 删除编号200以后的学生及其所有相关数据
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-- ========================================
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-- 账号：root
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-- 密码：root
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-- 数据库：study
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-- ========================================
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-- ========================================
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-- 第1步：先查询要删除的学生（确认）
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-- ========================================
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-- 查询编号200以后的学生用户
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SELECT
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user_id,
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user_name,
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nick_name,
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user_type,
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create_time
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FROM sys_user
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WHERE user_id > 200
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AND user_type IN ('02', 'student')
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ORDER BY user_id;
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-- 统计数量
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SELECT COUNT(*) AS will_delete_count
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FROM sys_user
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WHERE user_id > 200
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AND user_type IN ('02', 'student');
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-- ========================================
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-- 第2步：删除相关数据（按依赖顺序）
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-- ========================================
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-- 2.1 删除学习记录详情
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DELETE FROM study_learning_detail
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WHERE student_id > 200;
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-- 2.2 删除学习记录
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DELETE FROM study_learning_record
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WHERE student_id > 200;
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-- 2.3 删除课程分配
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DELETE FROM study_course_assignment
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WHERE student_id > 200;
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-- 2.4 删除学生班级关联（重要：这是导致数量不一致的主要原因）
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DELETE FROM study_student_class
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WHERE student_id > 200;
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-- 2.5 删除考试记录
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DELETE FROM study_exam_record
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WHERE student_id > 200;
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-- 2.6 删除答题记录
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DELETE FROM study_student_answer
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WHERE student_id > 200;
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-- 2.7 删除学生变更记录
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DELETE FROM study_student_change_log
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WHERE student_id > 200;
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-- 2.8 删除语音评测记录（如果有）
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DELETE FROM study_voice_evaluation
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WHERE student_id > 200;
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-- ========================================
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-- 第3步：删除用户角色和岗位关联
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-- ========================================
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-- 3.1 删除用户角色关联
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DELETE FROM sys_user_role
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WHERE user_id > 200
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AND user_id IN (
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SELECT user_id FROM sys_user
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WHERE user_type IN ('02', 'student')
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);
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-- 3.2 删除用户岗位关联
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DELETE FROM sys_user_post
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WHERE user_id > 200
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AND user_id IN (
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SELECT user_id FROM sys_user
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WHERE user_type IN ('02', 'student')
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);
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-- ========================================
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-- 第4步：最后删除用户表记录
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-- ========================================
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DELETE FROM sys_user
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WHERE user_id > 200
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AND user_type IN ('02', 'student');
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-- ========================================
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-- 第5步：验证删除结果
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-- ========================================
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-- 验证1：确认编号200以后的学生已删除
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SELECT COUNT(*) AS remaining_students_after_200
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FROM sys_user
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WHERE user_id > 200
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AND user_type IN ('02', 'student');
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-- 应该返回 0
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-- 验证2：查看剩余的学生数量
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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 IN ('02', 'student')
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UNION ALL
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SELECT
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'班级学生数' AS type,
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COUNT(DISTINCT student_id) AS count
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FROM study_student_class
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UNION ALL
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SELECT
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'课程分配学生数' AS type,
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COUNT(DISTINCT student_id) AS count
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FROM study_course_assignment;
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-- 三个数字应该一致
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-- 验证3：查看剩余学生的编号范围
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SELECT
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MIN(user_id) AS min_id,
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MAX(user_id) AS max_id,
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COUNT(*) AS total_count
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FROM sys_user
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WHERE user_type IN ('02', 'student');
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-- max_id 应该 <= 200
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-- 验证4：确认没有孤儿数据
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SELECT
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'孤儿班级关联' AS type,
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COUNT(*) AS count
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FROM study_student_class sc
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LEFT JOIN sys_user u ON sc.student_id = u.user_id
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WHERE u.user_id IS NULL
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UNION ALL
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SELECT
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'孤儿课程分配' AS type,
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COUNT(*) AS count
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FROM study_course_assignment ca
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LEFT JOIN sys_user u ON ca.student_id = u.user_id
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WHERE u.user_id IS NULL
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UNION ALL
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SELECT
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'孤儿学习记录' AS type,
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COUNT(*) AS count
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FROM study_learning_record lr
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LEFT JOIN sys_user u ON lr.student_id = u.user_id
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WHERE u.user_id IS NULL;
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-- 所有应该返回 0
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-- ========================================
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-- 完成！
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-- ========================================
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-- 删除成功后，用户管理、课程分配、班级管理的学生数量应该一致
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-- ========================================
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