90 lines
3.0 KiB
SQL
90 lines
3.0 KiB
SQL
-- ========================================
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-- 创建辅助视图，便于查询和统计
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-- ========================================
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USE study;
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-- 视图1：学生当前班级视图（只显示有效分配）
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DROP VIEW IF EXISTS v_student_current_class;
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CREATE VIEW v_student_current_class AS
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SELECT
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u.user_id,
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u.nick_name AS student_name,
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u.prison_area,
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c.id AS class_id,
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c.class_name,
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sc.join_time,
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sc.status
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FROM sys_user u
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INNER JOIN student_class sc ON u.user_id = sc.student_id
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INNER JOIN class c ON sc.class_id = c.id
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WHERE u.del_flag = '0'
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AND u.register_type = 'student'
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AND sc.status = 1;
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-- 视图2：班级统计视图（各班级学生数）
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DROP VIEW IF EXISTS v_class_statistics;
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CREATE VIEW v_class_statistics AS
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SELECT
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c.id AS class_id,
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c.class_name,
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c.prison_area AS class_prison_area,
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COUNT(DISTINCT sc.student_id) AS total_students,
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COUNT(DISTINCT CASE WHEN sc.status = 1 THEN sc.student_id END) AS active_students,
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COUNT(DISTINCT CASE WHEN sc.status = 0 THEN sc.student_id END) AS inactive_students,
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MIN(sc.join_time) AS first_join_time,
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MAX(sc.join_time) AS last_join_time
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FROM class c
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LEFT JOIN student_class sc ON c.id = sc.class_id
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LEFT JOIN sys_user u ON sc.student_id = u.user_id AND u.del_flag = '0'
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GROUP BY c.id, c.class_name, c.prison_area;
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-- 视图3：监区统计视图
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DROP VIEW IF EXISTS v_prison_area_statistics;
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CREATE VIEW v_prison_area_statistics AS
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SELECT
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u.prison_area,
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COUNT(DISTINCT u.user_id) AS total_students,
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COUNT(DISTINCT CASE WHEN sc.student_id IS NOT NULL THEN u.user_id END) AS assigned_students,
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COUNT(DISTINCT CASE WHEN sc.student_id IS NULL THEN u.user_id END) AS unassigned_students,
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COUNT(DISTINCT sc.class_id) AS total_classes
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FROM sys_user u
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LEFT JOIN student_class sc ON u.user_id = sc.student_id AND sc.status = 1
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WHERE u.del_flag = '0'
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AND u.register_type = 'student'
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GROUP BY u.prison_area;
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-- 视图4：课程分配详情视图（包含课程信息）
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DROP VIEW IF EXISTS v_course_assignment_detail;
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CREATE VIEW v_course_assignment_detail AS
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SELECT
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ca.id AS assignment_id,
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co.course_name,
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c.class_name,
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u.prison_area,
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ca.student_count,
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ca.start_time,
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ca.end_time,
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CASE
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WHEN ca.end_time < NOW() THEN '已结束'
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WHEN ca.start_time > NOW() THEN '未开始'
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ELSE '进行中'
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END AS status_desc
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FROM course_assignment ca
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INNER JOIN course co ON ca.course_id = co.id
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LEFT JOIN class c ON ca.class_id = c.id
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LEFT JOIN (
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SELECT DISTINCT prison_area, class_id
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FROM student_class sc
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INNER JOIN sys_user u ON sc.student_id = u.user_id
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WHERE sc.status = 1
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) u ON ca.class_id = u.class_id;
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SELECT '✅ 视图创建成功！' AS result;
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SELECT '' AS blank_line;
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SELECT '可用视图：' AS info;
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SELECT '1. v_student_current_class - 学生当前班级' AS view_list;
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SELECT '2. v_class_statistics - 班级统计' AS view_list;
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SELECT '3. v_prison_area_statistics - 监区统计' AS view_list;
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SELECT '4. v_course_assignment_detail - 课程分配详情' AS view_list;
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