22 lines
557 B
MySQL
22 lines
557 B
MySQL
|
-- 正确的SQL查询（根据实际表结构）
|
|||
|
|
|
|||
|
|
-- 1. 查询课件表中的文件路径（最重要）
|
|||
|
|
SELECT id, title, type, file_path, file_size, file_name, create_time
|
|||
|
|
FROM courseware
|
|||
|
|
ORDER BY create_time DESC
|
|||
|
|
LIMIT 10;
|
|||
|
|
|
|||
|
|
-- 2. 查询课程表（看看有没有图片字段）
|
|||
|
|
DESC course;
|
|||
|
|
|
|||
|
|
-- 3. 查看courseware表的完整结构
|
|||
|
|
DESC courseware;
|
|||
|
|
|
|||
|
|
-- 4. 统计不同路径前缀的文件数量
|
|||
|
|
SELECT
|
|||
|
|
SUBSTRING_INDEX(file_path, '/', 3) AS path_prefix,
|
|||
|
|
COUNT(*) AS file_count
|
|||
|
|
FROM courseware
|
|||
|
|
WHERE file_path IS NOT NULL
|
|||
|
|
GROUP BY path_prefix;
|