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SQL Alter Table Add Multiple Columns

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sql alter table add multiple columns

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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Comments:1
Dewashish Kuamr pal
October 8, 2012
SQL

sql> select *from Dewashish84; E_ID E_NAME E_EDUCATION ---------- ------------- --------------- 100 MCA 101 MSCIT 145 BA 103 MTECH 5 BTECH SQL> update Dewashish84 set E_NAME= decode(E_EDUCATION,'MCA','dewa','MSCIT','Raj','BA','mohan', 'MTECH','ram'); 5 rows updated. SQL> select *from Dewashish84; E_ID E_NAME E_EDUCATION ---------- ------------- --------------- 100 dewa MCA 101 Raj MSCIT 145 mohan BA 103 ram MTECH 5 Sohan BTECH SQL> alter table Dewashish84 add (e_location varchar2(10),E_salary number(4,2)); Table altered. SQL> select *from Dewashish84; E_ID E_NAME E_EDUCATION E_LOCATION E_SALARY ---------- ------------- --------------- ---------- ---------- 100 dewa MCA 101 Raj MSCIT 145 mohan BA 103 ram MTECH 5 Sohan BTECH