95 lines
2.1 KiB
MySQL
95 lines
2.1 KiB
MySQL
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-- 1️⃣ 先查看要删除的用户（确认范围）
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SELECT user_id, user_name, nick_name, register_type, create_time
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FROM sys_user
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WHERE user_id > 200 AND del_flag = '0'
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ORDER BY user_id;
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-- 2️⃣ 查看影响范围（统计）
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SELECT
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'用户数' AS 项目,
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COUNT(*) AS 数量
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FROM sys_user
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WHERE user_id > 200 AND del_flag = '0'
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UNION ALL
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SELECT
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'学习记录数',
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COUNT(*)
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FROM learning_record
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WHERE student_id > 200
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UNION ALL
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SELECT
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'学习详情数',
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COUNT(*)
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FROM learning_detail
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WHERE student_id > 200
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UNION ALL
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SELECT
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'考试成绩数',
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COUNT(*)
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FROM score
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WHERE student_id > 200
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UNION ALL
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SELECT
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'班级关联数',
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COUNT(*)
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FROM student_class
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WHERE student_id > 200;
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-- ============================================================
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-- ⚠️ 确认无误后，执行以下删除操作
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-- ============================================================
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-- 3️⃣ 删除关联数据（按顺序）
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-- 删除学习详情
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DELETE FROM learning_detail
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WHERE student_id > 200;
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-- 删除学习记录
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DELETE FROM learning_record
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WHERE student_id > 200;
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-- 删除考试成绩
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DELETE FROM score
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WHERE student_id > 200;
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-- 删除班级关联
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DELETE FROM student_class
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WHERE student_id > 200;
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-- 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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-- 删除课程分配（如果用户是学生）
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DELETE FROM course_assignment
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WHERE student_id > 200;
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-- 4️⃣ 最后删除用户表记录
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DELETE FROM sys_user
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WHERE user_id > 200 AND del_flag = '0';
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-- 5️⃣ 验证删除结果
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SELECT
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'剩余用户数' AS 验证项,
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COUNT(*) AS 数量
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FROM sys_user
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WHERE del_flag = '0';
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-- ============================================================
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-- 💡 如果想使用逻辑删除（推荐，可恢复），使用以下语句代替
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-- ============================================================
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/*
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-- 逻辑删除用户（设置 del_flag = '2'）
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UPDATE sys_user
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SET del_flag = '2',
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update_time = NOW()
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WHERE user_id > 200 AND del_flag = '0';
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-- 验证逻辑删除
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SELECT user_id, user_name, nick_name, del_flag
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FROM sys_user
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WHERE user_id > 200;
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*/
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