MyISAM data table
After a record with the maximum number is deleted, the number cannot be reused.
You can use the "auto_increment = N" option to specify an auto-increment initial value when creating a table.
You can use the alter table table_name
From: http://blog.chinaunix.net/space.php? Uid = 13626447 & Do = Blog & cuid = 392987
Create Table Test(Id int unsigned not null primary key auto_increment,Username varchar (15) not null)Auto_increment = 100;
Repeated innodb auto-increment column values
1. duplicate values in the innodb auto-increment column
Start with the problem and reproduce the bug.
use test;drop table t1;create table t1(id int auto_increment, a int, primary key (id))
How does SQL Server modify the auto-increment column value and corresponding solutions?
A special task encountered in today's work is to change the values of the two auto-incrementing columns.Since the SQL Server platform has previously migrated the
MySQL faq:how do I define a MySQL auto increment field?Here's an example of the normally create a MySQL auto Increment (auto_increment) field:CREATE TABLE pizzas ( ID int auto_increment NOT NULL, name varchar (+) NOT NULL, primary key (ID)); As
MySQL tutorial-When AUTO_INCREMENT auto-increment encounters 0
DBAs familiar with SQL Server know that if you want to display the auto-increment values in SQL Server, except for the auto-increment columns in the INSERT statement, you also need to
[PHP] MySQL obtains the primary key (auto-increment ID) and mysql primary key of the inserted data.
To prevent primary key conflicts, auto-increment (auto_increment type) fields are often used in DB Design. Therefore, the primary key of the
This article mainly introduces the primary key in MySQL and the usage tutorial for setting auto-increment. it is the basic knowledge in MySQL getting started. if you need it, refer
1. primary key declaration method:You can add a primary key to the
To learn about the MySQL database, MySQL auto-increment fields are one of the most basic parts. The following describes some common statements for MySQL auto-increment fields. I hope this will help you learn about MySQL auto-increment fields.
[PHP] MySQL obtains the primary key (auto-increment ID) of the inserted data. to prevent primary key conflicts, the auto-increment (auto_increment type) field is often used during database design. Therefore, the primary key of the modified record is
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