diff --git a/blog/php-mysql/sql-join.md b/blog/php-mysql/sql-join.md
index 6e57bfb1524694be4674b253d1ae18a703725d16..10bea424635fc5bd04daee48ffd35328d246463e 100644
--- a/blog/php-mysql/sql-join.md
+++ b/blog/php-mysql/sql-join.md
@@ -348,27 +348,3 @@ select * from my_student left join my_class on my_student.class_id = my_class.cl
 ```
 
 通常不使用
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-https://www.bilibili.com/video/BV1Vx411g7uJ?p=46&spm_id_from=pageDriver
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