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Multiplying column with NULL row in MySQL?
To multiply with NULL row, you can use COALESCE(). Let us first create a table −
mysql> create table DemoTable1842 ( NumberOfItems int, Amount int ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1842 values(10,40); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1842 values(20,5); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1842 values(NULL,10); Query OK, 1 row affected (0.00 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1842;
This will produce the following output −
+---------------+--------+ | NumberOfItems | Amount | +---------------+--------+ | 10 | 40 | | 20 | 5 | | NULL | 10 | +---------------+--------+ 3 rows in set (0.00 sec)
Here is the query to multiply column with NULL rows −
mysql> select NumberOfItems,Amount, coalesce(NumberOfItems,1)*Amount as Total from DemoTable1842;
This will produce the following output −
+---------------+--------+-------+ | NumberOfItems | Amount | Total | +---------------+--------+-------+ | 10 | 40 | 400 | | 20 | 5 | 100 | | NULL | 10 | 10 | +---------------+--------+-------+ 3 rows in set (0.00 sec)
Updated on: 26-Dec-2019
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