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Return value from a row if it is NOT NULL, else return the other row value in another column with MySQL
For this, you can use IFNULL(). Let us first create a table −
mysql> create table DemoTable ( FirstName varchar(100), LastName varchar(100) ); Query OK, 0 rows affected (0.62 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('John','Doe');
Query OK, 1 row affected (0.29 sec)
mysql> insert into DemoTable values(NULL,'Taylor');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('David',NULL);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values(NULL,'Miller');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+----------+ | FirstName | LastName | +-----------+----------+ | John | Doe | | NULL | Taylor | | David | NULL | | NULL | Miller | +-----------+----------+ 4 rows in set (0.00 sec)
Following is the query to return value from a row if it is NOT NULL, else return the other row value in another column −
mysql> select ifnull(FirstName,LastName) as Result from DemoTable;
This will produce the following output −
+--------+ | Result | +--------+ | John | | Taylor | | David | | Miller | +--------+ 4 rows in set (0.00 sec)
Updated on: 30-Sep-2019
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