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Place a specific value for NULL values in a MySQL column
Use IFNULL() to find and place a specific value for NULL values. Let us first create a table −
mysql> create table DemoTable1878 ( FirstName varchar(20) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1878 values('Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1878 values(NULL);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1878 values('David');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1878 values(NULL);
Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1878;
This will produce the following output −
+-----------+ | FirstName | +-----------+ | Chris | | NULL | | David | | NULL | +-----------+ 4 rows in set (0.00 sec)
Here is the query to work with IFNULL() −
mysql> select ifnull(FirstName,'Robert') from DemoTable1878;
This will produce the following output −
+----------------------------+ | ifnull(FirstName,'Robert') | +----------------------------+ | Chris | | Robert | | David | | Robert | +----------------------------+ 4 rows in set (0.00 sec)
Updated on: 27-Dec-2019
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