How to make MySQL table primary key auto increment?

To make MySQL table primary key auto increment, use the below syntax

CREATE TABLE yourTableName    (    yourColumnName INT(6) ZEROFILL NOT NULL AUTO_INCREMENT,    PRIMARY KEY(yourColumnName)    );

Let us first create a table and set primary key auto increment −

mysql> CREATE TABLE DemoTable    (    UserId INT(6) ZEROFILL NOT NULL AUTO_INCREMENT,    PRIMARY KEY(UserId)    ); Query OK, 0 rows affected (0.81 sec)

Insert some records in the table using insert command −

mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.12 sec) mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.13 sec) mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.10 sec) mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.44 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+--------+ | UserId | +--------+ | 000001 | | 000002 | | 000003 | | 000004 | +--------+ 4 rows in set (0.00 sec)