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
-> );
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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;
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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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