Mysql Alter Rename Column
Mysql Alter Rename Column is used to modify the table definition and rename the existing column of table.
Understand with Example
The Tutorial illustrate an example from 'Mysql Alter Rename Column'. To understand this example,The create table keywords is used to create a table 'employees'. The table 'employee' have a Empid as Primary Key.
Query to create table:-
CREATE TABLE employ
->);ees (
->Empid int(10),
->Empname varchar(60),
->date date
->PRIMARY KEY(Empid)
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Query to insert data into Table named employees:
Once your table is created ,you use insert into statement that add the records or rows to the created 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:
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 column name:
The Query alter table modifies the table 'employees' and change the existing fieldname from 'date' to 'date of birth'.
mysql> alter table employees
-> change date dateofbirth date;
Query OK, 2 rows affected (0.13 sec)
Records: 2 Duplicates: 0 Warnings: 0
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Output:-
mysql> select * from employees; +-------+---------+-------------+ | empid | empname | dateofbirth | +-------+---------+-------------+ | 1 | Girish | 2008-12-22 | | 2 | Komal | 2008-12-23 | +-------+---------+-------------+ 2 rows in set (0.02 sec) |