当我将空字符串插入声明为 NOT NULL 的 MySQL 列时，数据类型起什么作用？

mysql> create table test(id int NOT NULL, Name Varchar(10));
Query OK, 0 rows affected (0.19 sec)

mysql> Insert into test(id, name) values('1', 'Gaurav'),('0','Rahul'),('','Aarav');
Query OK, 3 rows affected, 1 warning (0.08 sec)
Records: 3 Duplicates: 0 Warnings: 1

mysql> Select * from test;
+----+--------+
| id | Name   |
+----+--------+
|  1 | Gaurav |
|  0 | Rahul  |
|  0 | Aarav  |
+----+--------+
3 rows in set (0.00 sec)

mysql> create table test123(id Varchar(10) NOT NULL, Name Varchar(10));
Query OK, 0 rows affected (0.19 sec)

mysql> Insert into test123(id, name) values('1', 'Gaurav'),('0','Rahul'),('','Aarav');
Query OK, 3 rows affected, 1 warning (0.08 sec)
Records: 3 Duplicates: 0 Warnings: 1

mysql> Select * from test123;
+----+--------+
| id | Name   |
+----+--------+
|  1 | Gaurav |
|  0 | Rahul  |
|    | Aarav  |
+----+--------+
3 rows in set (0.00 sec)