-- 仅查询课件时长情况（只读操作，不需要修改权限）
-- 执行日期：2025-12-05

USE ry_study;

-- 1. 查看当前课程1的所有课件时长情况
SELECT 
    id,
    name,
    type,
    duration,
    file_path,
    CASE 
        WHEN duration IS NULL THEN '⚠️ NULL'
        WHEN duration = 0 THEN '⚠️ 0'
        ELSE '✅ 正常'
    END as status
FROM courseware
WHERE course_id = 1
ORDER BY id;

-- 2. 检查学习详情中的最大播放位置（可以作为duration的参考）
SELECT 
    c.id as courseware_id,
    c.name,
    c.type,
    c.duration as configured_duration,
    MAX(ld.video_end_position) as max_position,
    COUNT(ld.id) as record_count,
    CASE 
        WHEN c.duration IS NULL OR c.duration = 0 THEN 
            CONCAT('建议设置为: ', MAX(ld.video_end_position))
        WHEN MAX(ld.video_end_position) > c.duration THEN
            CONCAT('⚠️ 实际更长: ', MAX(ld.video_end_position), '秒')
        ELSE '✅ 正常'
    END as recommendation
FROM courseware c
LEFT JOIN learning_detail ld ON ld.courseware_id = c.id
WHERE c.course_id = 1
GROUP BY c.id, c.name, c.type, c.duration
ORDER BY c.id;

-- 3. 查看课件882和873的具体情况
SELECT 
    id,
    name,
    type,
    duration,
    file_path
FROM courseware
WHERE id IN (882, 873) AND course_id = 1;
