diff --git a/mysql-day02.sql b/mysql-day02.sql
index ae5a719..5e6cfc8 100644
--- a/mysql-day02.sql
+++ b/mysql-day02.sql
@@ -42,4 +42,11 @@ values
     ('wuji2','张无忌2',1,now(),now()),
     ('wuji3','张无忌3',1,now(),now()),
     ('wuji4','张无忌4',1,now(),now())
-;
\ No newline at end of file
+;
+
+-- DML : 更新数据 - update
+-- 1. 将 tb_emp 表的ID为1员工 姓名name字段更新为 '张四'
+update tb_emp set name = '张四' where id = 1;
+update tb_emp set name = '张四' ;
+-- 2. 将 tb_emp 表的所有员工的入职日期更新为 '2010-01-01'
+update tb_emp set entrydate='2010-01-01',update_time=now();
\ No newline at end of file