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Can we use ADD and CHANGE with ALTER Statement in MySQL?
Yes, we can use ADD and CHANGE with ALTER statement. Let us first create a table −
mysql> create table DemoTable -> ( -> Name varchar(100), -> Age int -> ); Query OK, 0 rows affected (0.84 sec)
Now check the description of table.
mysql> desc DemoTable;
Output
This will produce the following output −
+-------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+--------------+------+-----+---------+-------+ | Name | varchar(100) | YES | | NULL | | | Age | int(11) | YES | | NULL | | +-------+--------------+------+-----+---------+-------+ 2 rows in set (0.25 sec)
Here is the query with ALTER to update a column name as well adding new columns −
mysql> alter table DemoTable -> add column Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> add column CountryName varchar(100) after Age, -> change column Name FirstName varchar(200); Query OK, 0 rows affected (1.51 sec) Records: 0 Duplicates: 0 Warnings: 0
Now check the description of table once again −
mysql> desc DemoTable;
Output
This will produce the following output −
+-------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+--------------+------+-----+---------+----------------+ | FirstName | varchar(200) | YES | | NULL | | | Age | int(11) | YES | | NULL | | | CountryName | varchar(100) | YES | | NULL | | | Id | int(11) | NO | PRI | NULL | auto_increment | +-------------+--------------+------+-----+---------+----------------+ 4 rows in set (0.00 sec)
Updated on: 30-Jun-2020
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