如何在从 MySQL 表中删除数据后自动增加 1?
mysqlmysqli database更新于 2025/7/28 12:28:17
为此，您可以使用 TRUNCATE TABLE 命令。让我们首先创建一个表 −
mysql> create table DemoTable1796 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20) ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1796(StudentName) values('Chris Brown');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1796(StudentName) values('David Miller');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1796(StudentName) values('John Doe');
Query OK, 1 row affected (0.00 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1796;
这将产生以下输出 −
+-----------+--------------+ | StudentId | StudentName | +-----------+--------------+ | 1 | Chris Brown | | 2 | David Miller | | 3 | John Doe | +-----------+--------------+ 3 rows in set (0.00 sec)
这是从表中删除记录的查询 −
mysql> delete from DemoTable1796; Query OK, 3 rows affected (0.00 sec)
现在向表中插入一条记录
mysql> insert into DemoTable1796(StudentName) values('John Doe');
Query OK, 1 row affected (0.00 sec)
mysql> select * from DemoTable1796;
+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
| 4 | John Doe |
+-----------+-------------+
1 row in set (0.00 sec)
现在您可以使用 TRUNCATE TABLE 命令
mysql> truncate table DemoTable1796; Query OK, 0 rows affected (0.00 sec)
现在，让我们在表中插入一些记录
mysql> insert into DemoTable1796(StudentName) values('John Doe');
Query OK, 1 row affected (0.00 sec)
mysql> select * from DemoTable1796;
+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
| 1 | John Doe |
+-----------+-------------+
1 row in set (0.00 sec)
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