How to append 000 in a MySQL column value?

To append 000, use the concept of ZEROFILL. Let us first create a table −

mysql> create table DemoTable1913
   (
   Code int(4) ZEROFILL AUTO_INCREMENT NOT NULL,
   PRIMARY KEY(Code)
   );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1913 values(1);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1913 values(2);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1913 values(3);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1913 values(4);
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1913;

This will produce the following output −

+------+
| Code |
+------+
| 0001 |
| 0002 |
| 0003 |
| 0004 |
+------+
4 rows in set (0.00 sec)