Add fields to the specified database location

Add fields to the specified position in the database tutorial
Mysql tutorial> -- add a field to a database at a specified location
Mysql> drop table if exists t;
Query OK, 0 rows affected (0.06 sec)

Mysql> create table t (age int, address varchar (50 ));
Query OK, 0 rows affected (0.06 sec)

Mysql> desc t;
+ --------- + ------------- + ------ + ----- + --------- + ------- +
| Field | Type | Null | Key | Default | Extra |
+ --------- + ------------- + ------ + ----- + --------- + ------- +
| Age | int (11) | YES | NULL |
| Address | varchar (50) | YES | NULL |
+ --------- + ------------- + ------ + ----- + --------- + ------- +
2 rows in set (0.02 sec)

Mysql> alter table t add column name varchar (20) after age;
Query OK, 0 rows affected (0.16 sec)
Records: 0 Duplicates: 0 Warnings: 0

Mysql> desc t;
+ --------- + ------------- + ------ + ----- + --------- + ------- +
| Field | Type | Null | Key | Default | Extra |
+ --------- + ------------- + ------ + ----- + --------- + ------- +
| Age | int (11) | YES | NULL |
| Name | varchar (20) | YES | NULL |
| Address | varchar (50) | YES | NULL |
+ --------- + ------------- + ------ + ----- + --------- + ------- +
3 rows in set (0.00 sec)

Mysql> alter table t add column id int FIRST;
Query OK, 0 rows affected (0.13 sec)
Records: 0 Duplicates: 0 Warnings: 0

Mysql> desc t;
+ --------- + ------------- + ------ + ----- + --------- + ------- +
| Field | Type | Null | Key | Default | Extra |
+ --------- + ------------- + ------ + ----- + --------- + ------- +
| Id | int (11) | YES | NULL |
| Age | int (11) | YES | NULL |
| Name | varchar (20) | YES | NULL |
| Address | varchar (50) | YES | NULL |
+ --------- + ------------- + ------ + ----- + --------- + ------- +
4 rows in set (0.00 sec)

Mysql>