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Change tinyint default value to 1 in MySQL?
You can use DEFAULT command for this. Following is the syntax −
alter table yourTableName change yourColumnName yourColumnName TINYINT(1) DEFAULT 1 NOT NULL;
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserName varchar(20), UserAge int, isMarried tinyint(1) ); Query OK, 0 rows affected (0.80 sec)
Let us check the description of table −
mysql> desc DemoTable;
This will produce the following output −
+-----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+-------------+------+-----+---------+----------------+ | Id | int(11) | NO | PRI | NULL | auto_increment | | UserName | varchar(20) | YES | | NULL | | | UserAge | int(11) | YES | | NULL | | | isMarried | tinyint(1) | YES | | NULL | | +-----------+-------------+------+-----+---------+----------------+ 4 rows in set (0.21 sec)
Following is the query to change tinyint default value to 1 −
mysql> alter table DemoTable change isMarried isMarried TINYINT(1) DEFAULT 1 NOT NULL; Query OK, 0 rows affected (1.29 sec) Records: 0 Duplicates: 0 Warnings: 0
Let us check the description of table once again. The default value of tinyint has been changed to 1 −
mysql> desc DemoTable;
This will produce the following output −
+-----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+-------------+------+-----+---------+----------------+ | Id | int(11) | NO | PRI | NULL | auto_increment | | UserName | varchar(20) | YES | | NULL | | | UserAge | int(11) | YES | | NULL | | | isMarried | tinyint(1) | NO | | 1 | | +-----------+-------------+------+-----+---------+----------------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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