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How to set default value to NULL in MySQL?
Use DEFAULT keyword in MySQL to set default value to NULL. Let us first create a −
mysql> create table DemoTable1440 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20) DEFAULT NULL, -> StudentAge int DEFAULT NULL -> ); Query OK, 0 rows affected (0.55 sec)
Insert some records in the table using insert command. For values left blank, the default gets inserted −
mysql> insert into DemoTable1440(StudentName,StudentAge) values('Chris',21);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable1440 values();
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1440(StudentName) values('David');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1440(StudentAge) values(24);
Query OK, 1 row affected (0.09 sec)
Display all records from the table using select −
mysql> select * from DemoTable1440;
This will produce the following output −
+-----------+-------------+------------+ | StudentId | StudentName | StudentAge | +-----------+-------------+------------+ | 1 | Chris | 21 | | 2 | NULL | NULL | | 3 | David | NULL | | 4 | NULL | 24 | +-----------+-------------+------------+ 4 rows in set (0.00 sec)
Updated on: 2019-11-12T06:56:10+05:30
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