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
Usage:
Create Table Test(Id int unsigned not null primary key auto_increment,Username varchar (15) not null)Auto_increment = 100;
In database
Today found in bulk INSERT, the self-increment primary key is not continuous ....InnoDB auto_increment Lock ModesThis section describes AUTO_INCREMENT the behavior of lock modes used to generate auto-increment values, and how each lock mode aff ECTS
PHP + MYSQL Query maximum value, Field ID (auto-increment), table tablePHP + MYSQL Query ID maximum value, Field ID (auto-increment), table, how can I implement it? can I give the source code Cainiao question, thank you .. ------ Solution -----------
About the auto-increment ID, each time a piece of data is deleted, and then 1, 2, 3, 4 cannot be connected... For example, if you delete the third data record, it will become 124.
Reply to discussion (solution)
Ignore himA primary key
Auto-increment of fields created in oracle -- two implementation methods are summarized: oracle Fields
Mysql and other databases have the function of Automatically increasing table IDs with the insertion of records, while oracle does not. We have
Article One original address: http://ej38.com/showinfo/mysql-202971.htmlArticle two: Click to transfer to the second articleIn database applications, we often use a unique number. The Auto_increment property of the field can be generated
Implement Auto-increment of oracle database fields (two methods): oracle Fields
Programmers know that mysql and other databases have the function of Automatically increasing table IDs with the insertion of records, but oracle does not, the following
Background:Self-growth is a very common data attribute, and in MySQL everyone is willing to let the field of the self-growth attribute be a primary key. In particular InnoDB, because of the characteristics of the InnoDB clustered index, using fields
First, demand:For a machine that already has a single instance of MySQL, add two MySQL databases and implement multiple instances of a single computer.One binding on port 3306, the other two bindings on port 3307,3308;Data are stored
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