Initial commit of akmon project

check_current_data.sql

@@ -0,0 +1,60 @@
+-- 查询当前数据库中的班级结构
+-- 检查已有的学校、年级、班级数据
+
+-- 1. 查看现有的学校数据
+SELECT id, name, type FROM public.ak_schools ORDER BY name;
+
+-- 2. 查看现有的年级数据  
+SELECT 
+    g.id, 
+    g.name as grade_name,
+    s.name as school_name
+FROM public.ak_grades g
+LEFT JOIN public.ak_schools s ON g.school_id = s.id
+ORDER BY s.name, g.name;
+
+-- 3. 查看现有的班级数据
+SELECT 
+    c.id as class_id,
+    c.name as class_name,
+    g.name as grade_name,
+    s.name as school_name,
+    COUNT(u.id) as student_count
+FROM public.ak_classes c
+LEFT JOIN public.ak_grades g ON c.grade_id = g.id
+LEFT JOIN public.ak_schools s ON g.school_id = s.id
+LEFT JOIN public.ak_users u ON u.class_id = c.id AND u.role = 'student'
+GROUP BY c.id, c.name, g.name, s.name
+ORDER BY s.name, g.name, c.name;
+
+-- 4. 查看学生的班级分布情况
+SELECT 
+    COALESCE(c.name, '未分配班级') as class_name,
+    COUNT(u.id) as student_count,
+    array_agg(u.username) as students
+FROM public.ak_users u
+LEFT JOIN public.ak_classes c ON u.class_id = c.id
+WHERE u.role = 'student'
+GROUP BY c.name
+ORDER BY student_count DESC;
+
+-- 5. 查看教师-班级关系（如果表存在）
+SELECT 
+    u.username as teacher_name,
+    c.name as class_name,
+    g.name as grade_name,
+    s.name as school_name
+FROM public.ak_teacher_roles tr
+JOIN public.ak_users u ON tr.user_id = u.id
+JOIN public.ak_classes c ON tr.class_id = c.id
+LEFT JOIN public.ak_grades g ON c.grade_id = g.id
+LEFT JOIN public.ak_schools s ON g.school_id = s.id
+ORDER BY u.username, c.name;
+
+-- 6. 检查是否有学生未分配班级
+SELECT 
+    COUNT(*) as total_students,
+    COUNT(CASE WHEN class_id IS NOT NULL THEN 1 END) as assigned_students,
+    COUNT(CASE WHEN class_id IS NULL THEN 1 END) as unassigned_students
+FROM public.ak_users 
+WHERE role = 'student';