SQL Alter Table Add Multiple Columns

Alter Table Add Multiple Columns in SQL modifies the table and add columns to the existing table.

Understand with Example

The Tutorial illustrates an example which demonstrate Alter Table Add Multiple Columns. The SQL Query create a table 'Stu_Table' with table attribute specified like field name, data type and etc using create statement.

Create Table

SQL statement to create table:

create table Stu_Table(Stu_Id varchar(2), Stu_Name varchar(15), Stu_Class  varchar(10));

Insert Data

SQL statement to insert data into table:

insert into Stu_Table values(1,'Komal',10);
insert into Stu_Table values(2,'Ajay',10);
insert into Stu_Table values(3,'Rakesh',10);
insert into Stu_Table values(4,'Bhanu',10);
insert into Stu_Table values(5,'Santosh',10);
insert into Stu_Table values(6,'Tanuj',10);

Describe Stu_Table

+-----------+-------------+------+-----+---------+-------+
| Field     | Type        | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| Stu_Id    | varchar(2)  | YES  |     |         |       |
| Stu_Name  | varchar(15) | YES  |     |         |       |
| Stu_Class | varchar(10) | YES  |     |         |       |
+-----------+-------------+------+-----+---------+-------+

Stu_Table

Records in the table:

+--------+----------+-----------+
| Stu_Id | Stu_Name | Stu_Class |
+--------+----------+-----------+
| 1      | Komal    | 10        |
| 2      | Ajay     | 10        |
| 3      | Rakesh   | 10        |
| 4      | Bhanu    | 10        |
| 5      | Santosh  | 10        |
| 6      | Tanuj    | 10        |
+--------+----------+-----------+

Add Multiple Columns Query

The Alter Table Query in SQL modifies the existing table 'Stu_Table' and add a multiple columns to the existing table. In this example, we add columns 'Stu_dob' and 'Stu_Address' to the existing table 'Stu_Table'.

Alter Table Stu_Table add (Stu_dob date, Stu_Addreass varchar(20));

Describe Stu_Table

The Describe Stu_Table show you the new fields added to the table'Stu_Table'.

+--------------+-------------+------+-----+---------+-------+
| Field        | Type        | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+-------+
| Stu_Id       | varchar(2)  | YES  |     |         |       |
| Stu_Name     | varchar(15) | YES  |     |         |       |
| Stu_Class    | varchar(10) | YES  |     |         |       |
| Stu_dob      | date        | YES  |     |         |       |
| Stu_Addreass | varchar(20) | YES  |     |         |       |
+--------------+-------------+------+-----+---------+-------+

Stu_Table

+--------+----------+-----------+---------+--------------+
| Stu_Id | Stu_Name | Stu_Class | Stu_dob | Stu_Addreass |
+--------+----------+-----------+---------+--------------+
| 1      | Komal    | 10        |         |              |
| 2      | Ajay     | 10        |         |              |
| 3      | Rakesh   | 10        |         |              |
| 4      | Bhanu    | 10        |         |              |
| 5      | Santosh  | 10        |         |              |
| 6      | Tanuj    | 10        |         |              |
+--------+----------+-----------+---------+--------------+

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