173 lines
4.2 KiB
SQL
173 lines
4.2 KiB
SQL
-- ========================================
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-- 清理孤儿数据 - 立即执行
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-- ========================================
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-- 问题：4194条班级关联记录的学生已被删除
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-- 影响：课程分配学生数 ≠ 用户管理学生数
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-- 解决：删除所有孤儿数据
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-- ========================================
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-- 第1步：查看要删除的数据（确认）
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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 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 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 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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-- ========================================
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-- 第2步：执行清理（按依赖顺序）
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-- ========================================
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-- 2.1 删除孤儿学习记录详情
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DELETE FROM learning_detail
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WHERE student_id IN (
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SELECT student_id FROM (
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SELECT ld.student_id
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FROM learning_detail ld
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LEFT JOIN sys_user u ON ld.student_id = u.user_id
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WHERE u.user_id IS NULL
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) AS orphan_details
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);
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-- 2.2 删除孤儿学习记录
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DELETE FROM learning_record
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WHERE student_id IN (
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SELECT student_id FROM (
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SELECT lr.student_id
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FROM 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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) AS orphan_records
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);
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-- 2.3 删除孤儿课程分配
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DELETE FROM course_assignment
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WHERE student_id IN (
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SELECT student_id FROM (
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SELECT ca.student_id
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FROM 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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) AS orphan_assignments
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);
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-- 2.4 删除孤儿学生班级关联（重要！）
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DELETE FROM student_class
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WHERE student_id IN (
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SELECT student_id FROM (
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SELECT sc.student_id
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FROM 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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) AS orphan_classes
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);
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-- 2.5 删除孤儿考试记录
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DELETE FROM exam_record
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WHERE student_id IN (
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SELECT student_id FROM (
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SELECT er.student_id
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FROM exam_record er
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LEFT JOIN sys_user u ON er.student_id = u.user_id
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WHERE u.user_id IS NULL
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) AS orphan_exams
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);
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-- 2.6 删除孤儿答题记录
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DELETE FROM student_answer
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WHERE student_id IN (
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SELECT student_id FROM (
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SELECT sa.student_id
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FROM student_answer sa
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LEFT JOIN sys_user u ON sa.student_id = u.user_id
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WHERE u.user_id IS NULL
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) AS orphan_answers
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);
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-- 2.7 删除孤儿学生变更记录
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DELETE FROM study_student_change_log
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WHERE student_id IN (
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SELECT student_id FROM (
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SELECT sc.student_id
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FROM study_student_change_log 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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) AS orphan_changes
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);
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-- ========================================
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-- 第3步：验证结果
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-- ========================================
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-- 再次查询孤儿数据（应该全为0）
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SELECT
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'孤儿班级关联' AS type,
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COUNT(*) AS remaining
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FROM 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 remaining
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FROM 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 remaining
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FROM 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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-- 应该全部显示 0
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-- ========================================
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-- 第4步：统计清理结果
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-- ========================================
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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 ('00', '01', '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 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 course_assignment;
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-- 三个数字应该一致或接近
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