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Mysql Alter Add Column
Posted on: January 13, 2009 at 12:00 AM

Mysql Alter Add Column is used to define the existing Table and add a new column to it.

Mysql Alter Add Column

Mysql Alter Add Column is used to define the existing Table and add a new column to it.

Understand with Example

The Tutorial demonstrate you 'Mysql Alter Add Column'. To understand this example, we create a table employees using create table statement in Mysql. The table employees has a Empid as Primary Key.

Query to create table:

CREATE TABLE `employees` (
            ->Empid int(10),  
            ->Empname varchar(60),    
             ->date date 
	     ->PRIMARY KEY(Empid)
           ->);

Query to insert data into Table named employees:

The insert into add the records or rows into table 'employees'.

mysql>insert into employees values(01,'Girish','2008-12-22');
Query OK, 1 row affected (0.02 sec)

mysql>insert into employee1 values(02,'Komal','2008-12-23');
Query OK, 1 row affected (0.02 sec)

Query to view data of Table named employees:

To view the detail from table 'employees' we use select query that return you the details.

mysql> select * from employees;

Output:-

+-------+---------+------------+
| Empid | Empname | date       |
+-------+---------+------------+
|     1 | Girish  | 2008-12-22 |
|     2 | Komal   | 2008-12-23 |
+-------+---------+------------+
2 rows in set (0.00 sec)

Query to alter Table named employees by adding column named city:

The Query Alter is used to define the table 'employees' and add a new column 'city' to the existing table 'employees'.

mysql> alter table employees
    -> add column city varchar(30);
Query OK, 2 rows affected (0.13 sec)
Records: 2  Duplicates: 0  Warnings: 0

Output:-

mysql> select * from employees;
+-------+---------+------------+------+
| Empid | Empname | date       | city |
+-------+---------+------------+------+
|     1 | Girish  | 2008-12-22 | NULL |
|     2 | Komal   | 2008-12-23 | NULL |
+-------+---------+------------+------+
2 rows in set (0.02 sec)

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