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Can we change the starting value of auto increment according to our choice?
You can use ALTER TABLE to change the auto_increment initial value: ALTER TABLE tbl AUTO_INCREMENT = 5; See the MySQL reference for more details. Yes, you can use the ALTER TABLE t AUTO_INCREMENT = 42 statement.
How can I change column auto increment in SQL?
In MySQL, the syntax to change the starting value for an AUTO_INCREMENT column using the ALTER TABLE statement is: ALTER TABLE table_name AUTO_INCREMENT = start_value; table_name. The name of the table whose AUTO_INCREMENT value you wish to change.
How to set the initial value of an auto incremented column?
While inserting records in a table there is no need to insert value under the auto-incremented column. These will be generated automatically. By default, the initial value of the auto-incremented column will be 1. You can change it using the ALTER TABLE query as shown below −
How to change auto incremented column in MySQL?
You can change it using the ALTER TABLE query as shown below − Let us create a table with name sales in MySQL database, with one of the columns as auto-incremented, using CREATE statement as shown below − Following JDBC program sets the initial value of the auto-incremented column to 1001 and inserts 6 records into it.
When to add NOT NULL constraint to auto increment?
The AUTO_INCREMENT column must have a NOT NULL constraint on it. When the AUTO_INCREMENT attribute is set to a column, MySQL automatically adds the NOT NULL constraint to the column on its own. If an id column hasn’t been added to the table, the below statement can be used −
Do you have to index AUTO INCREMENT in MySQL?
The AUTO_INCREMENT column needs to be indexed. This means it can either be a PRIMARY KEY or a UNIQUE index. The AUTO_INCREMENT column must have a NOT NULL constraint on it. When the AUTO_INCREMENT attribute is set to a column, MySQL automatically adds the NOT NULL constraint to the column on its own.