Display auto increment user id sequence number to begin from 001 in MySQL?

For this, use ZEROFILL and alter the table to begin from the same sequence −

alter table yourTableName
   change yourColumnName yourColumnName int(3) UNSIGNED ZEROFILL NOT NULL AUTO_INCREMENT PRIMARY KEY;

To understand the above syntax, let us first create a table −

mysql> create table DemoTable1958
   (
   UserId int,
   UserName varchar(20)
   );
Query OK, 0 rows affected (0.00 sec)

Here is the query to alter generated sequence number to begin from 001:

mysql> alter table DemoTable1958
   change UserId UserId int(3) UNSIGNED ZEROFILL NOT NULL AUTO_INCREMENT PRIMARY KEY;
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0

Let us check the table description:

mysql> desc DemoTable1958;

This will produce the following output −

+----------+--------------------------+------+-----+---------+----------------+
| Field    | Type                     | Null | Key | Default | Extra          |
+----------+--------------------------+------+-----+---------+----------------+
| UserId   | int(3) unsigned zerofill | NO   | PRI | NULL    | auto_increment |
| UserName | varchar(20)              | YES  |     | NULL    |                |
+----------+--------------------------+------+-----+---------+----------------+
2 rows in set (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1958(UserName) values('Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1958(UserName) values('David');
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1958;

This will produce the following output −

+--------+----------+
| UserId | UserName |
+--------+----------+
|    001 | Chris    |
|    002 | David    |
+--------+----------+
2 rows in set (0.00 sec)