133 lines
3.7 KiB
SQL
133 lines
3.7 KiB
SQL
-- ========================================
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-- 数据清理：删除孤儿数据（安全版本）
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-- ========================================
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-- 先检查表是否存在，再执行删除
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-- ========================================
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-- 第1步：查询当前用户和学生班级的数据状态
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SELECT
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'用户表总数' AS item,
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COUNT(*) AS count
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FROM sys_user
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UNION ALL
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SELECT
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'学生类型用户' AS item,
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COUNT(*) AS count
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FROM sys_user
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WHERE user_type = '02' OR user_type = 'student'
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UNION ALL
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SELECT
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'班级关联数' AS item,
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COUNT(*) AS count
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FROM study_student_class;
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-- ========================================
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-- 方案1：如果没有study_student表
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-- （学生信息直接在sys_user表中）
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-- ========================================
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-- 清理学习记录详情（通过user_id关联）
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DELETE FROM study_learning_detail
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WHERE student_id NOT IN (
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SELECT user_id FROM sys_user WHERE user_type IN ('02', 'student')
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);
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-- 清理学习记录
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DELETE FROM study_learning_record
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WHERE student_id NOT IN (
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SELECT user_id FROM sys_user WHERE user_type IN ('02', 'student')
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);
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-- 清理课程分配
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DELETE FROM study_course_assignment
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WHERE student_id NOT IN (
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SELECT user_id FROM sys_user WHERE user_type IN ('02', 'student')
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);
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-- 清理学生班级关联（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 NOT IN (
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SELECT user_id FROM sys_user WHERE user_type IN ('02', 'student')
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);
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-- 清理考试记录
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DELETE FROM study_exam_record
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WHERE student_id NOT IN (
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SELECT user_id FROM sys_user WHERE user_type IN ('02', 'student')
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);
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-- 清理答题记录
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DELETE FROM study_student_answer
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WHERE student_id NOT IN (
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SELECT user_id FROM sys_user WHERE user_type IN ('02', 'student')
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);
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-- 清理变更记录
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DELETE FROM study_student_change_log
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WHERE student_id NOT IN (
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SELECT user_id FROM sys_user WHERE user_type IN ('02', 'student')
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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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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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-- 应该显示三个数字一致或接近
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-- ========================================
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-- 如果需要更激进的清理（删除所有没有用户记录的数据）
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-- ========================================
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-- 查询孤儿班级关联（有班级关联但用户不存在）
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SELECT
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sc.student_id,
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COUNT(*) AS class_count,
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'用户不存在' AS status
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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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GROUP BY sc.student_id;
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-- 如果上面查询有结果，执行删除
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DELETE FROM study_student_class
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WHERE student_id IN (
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SELECT sc.student_id
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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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);
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-- ========================================
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-- 最终验证
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-- ========================================
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-- 确认没有孤儿数据
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SELECT COUNT(*) AS orphan_class_records
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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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-- 应该返回 0
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-- 确认数量一致
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SELECT
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(SELECT COUNT(*) FROM sys_user WHERE user_type IN ('02', 'student')) AS user_count,
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(SELECT COUNT(DISTINCT student_id) FROM study_student_class) AS class_student_count,
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(SELECT COUNT(DISTINCT student_id) FROM study_course_assignment) AS assignment_student_count;
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-- 三个数字应该一致或接近
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