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How to set NULL values in a table column and insert the same
To set NULL values, set the type as NULL as in the below syntax −
yourColumnName dataType NULL;
Let us first create a table −
mysql> create table DemoTable759 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100) NULL ); Query OK, 0 rows affected (0.72 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable759(FirstName) values('John');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable759(FirstName) values(NULL);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable759(FirstName) values('Carol');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable759(FirstName) values(NULL);
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable759;
This will produce the following output. NULL values are also visible in the column −
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John | | 2 | NULL | | 3 | Carol | | 4 | NULL | +----+-----------+ 4 rows in set (0.00 sec)
Updated on: 03-Sep-2019
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