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从MySQL表中删除数据后如何自动加1？

2024-04-25 09:04:03 334

为此，您可以使用TRUNCATETABLE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)
     );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable1796(StudentName) values('Chris Brown');
mysql> insert into DemoTable1796(StudentName) values('David Miller');
mysql> insert into DemoTable1796(StudentName) values('John Doe');

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;

现在将记录插入表中

mysql> insert into DemoTable1796(StudentName) values('John Doe');
mysql> select * from DemoTable1796;
+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
|         4 | John Doe    |
+-----------+-------------+
1 row in set (0.00 sec)

现在您可以使用TRUNCATETABLE命令

mysql> truncate table DemoTable1796;

现在，让我们将一些记录插入表中

mysql> insert into DemoTable1796(StudentName) values('John Doe');
mysql> select * from DemoTable1796;
+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
|         1 | John Doe    |
+-----------+-------------+
1 row in set (0.00 sec)

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从MySQL表中删除数据后如何自动加1？

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