SELECT ID,SOURCE,FILENAME,RELATIVEPATH,UPLOADTIME FROM T_FILE ORDER BY UPLOADTIME DESC WHERE RELATIVEPATH LIKE '%/NGRkYTMyODUtMmUxYS00NzM4LTk5OTYtN2E2MWE4NjRjODc5_4dda3285-2e1a-4738-9996-7a61a864c879%'帮我优化

在 SQL 语句中，ORDER BY 和 WHERE 关键字的顺序是不能颠倒的，正确的语法应该是先 WHERE 再 ORDER BY，即：

SELECT ID, SOURCE, FILENAME, RELATIVEPATH, UPLOADTIME 
FROM T_FILE 
WHERE RELATIVEPATH LIKE '%/NGRkYTMyODUtMmUxYS00NzM4LTk5OTYtN2E2MWE4NjRjODc5_4dda3285-2e1a-4738-9996-7a61a864c879%'
ORDER BY UPLOADTIME DESC;

此外，可以对 `RELATIVEPATH` 列创建索引来优化这个查询语句的执行效率，例如：

CREATE INDEX idx_relativepath ON T_FILE (RELATIVEPATH);

这样可以加速对 `RELATIVEPATH` 列的查找，提升整个查询语句的执行速度。