Perform mathematical calculations in a MySQL table with NULL and NON-NULL values
For this, you can use IFNULL() and perform mathematical calculations with NULL and NON-NULL values. Let us first create a table −
mysql> create table DemoTable1462
-> (
-> Value1 int,
-> Value2 int
-> );
Query OK, 0 rows affected (0.55 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1462 values(10,20);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1462 values(50,NULL);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1462 values(NULL,70);
Query OK, 1 row affected (0.25 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1462;
This will produce the following output −
+--------+--------+
| Value1 | Value2 |
+--------+--------+
| 10 | 20 |
| 50 | NULL |
| NULL | 70 |
+--------+--------+
3 rows in set (0.00 sec)
Following is the query to perform mathematical calculations in a MySQL table with NULL and NON-NULL values −
mysql> select ifnull(Value1,0)+ifnull(Value2,0) from DemoTable1462;
This will produce the following output −
+-----------------------------------+
| ifnull(Value1,0)+ifnull(Value2,0) |
+-----------------------------------+
| 30 |
| 50 |
| 70 |
+-----------------------------------+
3 rows in set (0.00 sec)
Published on 10-Dec-2019 06:57:35
