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)
|
|
Del.icio.us
Digg
Google
Spurl
Blink
Furl
Simpy
Y! MyWeb
