Reset auto increment initial value in mysql

                     Auto_ increment is used to increase by 1 while insert a new data to mysql table. The auto increment column must be defined as key. By default auto_increment is start with 1. Suppose you want to auto_increment starts with 'N' values. Then you can change the auto_increment initial value in mysql. IT is possible. First you create table with auto_increment. Then use following mysql query :

                   Alter table table_name AUTO_INCREMENT=N

Where, N can be any numbers like 100,1000,10000...

Create table with auto_increment in mysql:

                      You can add auto_increment while creating new table in mysql. The mysql query is:

                       CREATE TABLE table1 

                               (No int(5) NOT NULL AUTO_INCREMENT PRIMARY KEY, 

                                 Game_name varchar(15), Image varchar(15)) 

Now the table is created with auto increment. If you add any values, then auto_increment starts with 1 in mysql. Consider following example. You add 3 values to mysql table. ie,

                   insert into table1 values('','sample1','sample1.jpg')
                   insert into table1 values('','sample3','sample2.jpg')
                   insert into table1 values('','sample3','sample3.jpg')

Now your table look like this:

Change auto_increment initial value in mysql:    

                 
                                 You change auto_increment initial value to 100. The mysql query is:

                   Alter table table1 AUTO_INCREMENT=100

Now you insert data to your mysql table. Then it look like this:

Now you can see the row starts with 100. You can changed starting value of auto_increment in mysql


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Remove auto_increment from column in mysql

                       You created a table in which the column with specific definitions in mysql. You created table column with auto increment. To add auto increment to existing column, visit  add-auto-increment-to-existing-column in mysql. Then how can you remove it from column in mysql.  The following mysql query is used to remove auto increment from column in mysql.

Mysql Query:

                         Alter table table_name DROP PRIMARY KEY,
                          change column_name column_name datatype(length) definition

Consider the example:
The structure of table1 in database new look like this:

                        
                       Now we are going to remove auto increment from column 'No' in mysql table 'table1'.  The mysql query is:

                     Alter table table1 DROP PRIMARY KEY,
                      change No No int(5) NOT NULL

Now your structure look like this:

 
               Now you can see the column name 'No' is normal. There is no auto increment.

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Add auto_increment to existing column in mysql

                     Auto_ increment is used to increase by 1 while insert a new data to mysql table. The auto increment column must be defined as key.

Create table with auto_increment in mysql:

                      You can add auto_increment while creating new table. The mysql query is:

                       CREATE TABLE table1 

                               (No int(5) NOT NULL AUTO_INCREMENT PRIMARY KEY, 

                                 Game_name varchar(15), Image varchar(15)) 

Now the table is created with auto increment.

Add auto_increment to existing column in mysql:

                      You created a table in which the column with specific definitions in mysql. You created table column without auto increment. Then how can you add it to existing column in mysql.  The following mysql query is used to add auto increment to existing column in mysql.

Mysql Query:

                         Alter table table_name modify column_name datatype(length) AUTO_INCREMENT PRIMARY KEY

Consider the example:
The structure of table1 in database new look like this:

                         Now we are going to add auto increment to column 'No' in mysql table 'table1'.  The mysql query is:

                     Alter table table1 modify No int(5) AUTO_INCREMENT PRIMARY KEY

Now your structure look like this:

     Now you can see the column name 'No' is auto increment. Suppose  your mysql query like below:

     Alter table table1 modify No int(5) AUTO_INCREMENT

Then you'll get error like this:

                                 So you should be add 'AUTO_INCREMENT' with 'PRIMARY KEY' in mysql table.

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