优化代码

README.md

@@ -29,6 +29,7 @@ CREATE TABLE image_hashes (
 ```
 查询脚本：查询两个qq号之间不连续的地址，找出漏上传的QQ号
 ```mysql
+USE qqinfo;
 SELECT t1.id, t1.next_id
 FROM (
     SELECT id, LEAD(id) OVER (ORDER BY id) AS next_id