Mysql Alter Multiple Columns
Mysql Alter Multiple Columns is used to modify the table definition and
rename the columns name in a table.
Understand with Example
The Tutorial illustrate an example from 'Mysql Alter Multiple Columns'. To
grasp this example we create a table employee1.The create table is
used to create a table employee1 with respective fieldname and datatype.
Query to Create Table named employee1:
mysql>CREATE TABLE employee1 (
-> Empid int(10),
-> Empname varchar(60),
-> date date
-> );
|
Query to insert data into Table named employee1:
To insert the records or value into table employee1, we use insert
into query that add records or rows into table employee1.
mysql>insert into employee1 values(01,'Girish','2008-12-20');
Query OK, 1 row affected (0.02 sec)
mysql>insert into employee1 values(02,'Komal','2008-12-21');
Query OK, 1 row affected (0.02 sec)
mysql>insert into employee1 values(03,'vineet','2008-12-21');
Query OK, 1 row affected (0.02 sec)
mysql>insert into employee1 values(04,'Amit','2008-12-20');
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)
mysql>insert into employee1 values(02,'Sandeep','2008-12-24');
Query OK, 1 row affected (0.02 sec)
mysql>insert into employee1 values(02,'suman','2008-12-25');
Query OK, 1 row affected (0.02 sec)
mysql>insert into employee1 values(01,'AAA',' 2008-12-03');
Query OK, 1 row affected (0.02 sec)
|
Query to view data of Table named employee1:
To view the detail of table employee1, we use select query that returns you
the detail of table employee1.
mysql> select * from employee1;
|
Output:-
+-------+---------+------------+
| Empid | Empname | date |
+-------+---------+------------+
| 1 | Girish | 2008-12-20 |
| 2 | Komal | 2008-12-21 |
| 3 | vineet | 2008-12-21 |
| 4 | Amit | 2008-12-20 |
| 2 | Komal | 2008-12-23 |
| 2 | Sandeep | 2008-12-24 |
| 2 | suman | 2008-12-25 |
| 1 | AAA | 2008-12-03 |
+-------+---------+------------+
8 rows in set (0.00 sec)
|
Query to alter multiple column's of Table named employee1:
The Query alter modifies the table employee1 and change the existing
column name. The change keyword allows you to rename the existing column
name in table employee1..
mysql> alter table employee1
-> change Empname Name varchar(100),
-> change Dateofbirth DOB date;
|
Output:-
mysql> select * from employee1;
+-------+---------+------------+
| Empid | Name | DOB |
+-------+---------+------------+
| 1 | Girish | 2008-12-20 |
| 2 | Komal | 2008-12-21 |
| 3 | vineet | 2008-12-21 |
| 4 | Amit | 2008-12-20 |
| 2 | Komal | 2008-12-23 |
| 2 | Sandeep | 2008-12-24 |
| 2 | suman | 2008-12-25 |
| 1 | AAA | 2008-12-03 |
+-------+---------+------------+
8 rows in set (0.00 sec)
|
|
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