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MySQL Add Column
Posted on: October 6, 2010 at 12:00 AM

MySQL Add Column tutorial explains you to add the column to the existing table. The table structure can be changed using 'Alter table' query.

MySQL Add Column

MySQL Add Column tutorial explains you to add the column to the existing table. The table structure can be changed using 'Alter table' query. You can now add the new column in a table using add keyword in the query.

Understand with Example

The Tutorial describes Add Column in MySQL. To understand the example, lets see all the columns and its values from table employee using select query.

Query

 select * from employee;

Output

+----+--------+----------------------+
| id | name   | designation          |
+----+--------+----------------------+
| 1  | Ajay   | programmer           |
| 2  | Vinay  | programmer           |
| 4  | Kamal  | sr. graphic designer |
| 5  | Rajiv  | graphic designer     |
| 6  | Nitin  | content writer       |
| 7  | Sachin | programmer           |
| 8  | Karan  | programmer           |
+----+--------+----------------------+

The Alter Table employee is used to modify the table 'employee' and add a new column 'address' to the existing table 'employee'.

ALTER TABLE employee ADD address VARCHAR(50);

Now you can see the changed table and its value by select query.

Query

 select * from employee;

Output

+----+--------+----------------------+--------+
| id | name   | designation          |address |
+----+--------+----------------------+--------+
| 1  | Ajay   | programmer           |        |
| 2  | Vinay  | programmer           |        |
| 4  | Kamal  | sr. graphic designer |        |
| 5  | Rajiv  | graphic designer     |        |
| 6  | Nitin  | content writer       |        |
| 7  | Sachin | programmer           |        |
| 8  | Karan  | programmer           |        |
+----+--------+----------------------+--------+

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