Execute operations (plus, minus, multiply, divide) while updating a MySQL table?

Following is the syntax executing the plus (+) operator −

update yourTableName set yourColumnName3=(yourColumnName1+yourColumnName2)

The above syntax is only for plus operator. You need to change symbol like -,*,/ for other operations. Let us first create a table −

mysql> create table DemoTable
   -> (
   -> Number1 int,
   -> Number2 int,
   -> AddResult int,
   -> MinusResult int,
   -> MultiplyResult int,
   -> DivideResult int
   -> );
Query OK, 0 rows affected (0.89 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(Number1,Number2) values(40,20);
Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+---------+---------+-----------+-------------+----------------+--------------+
| Number1 | Number2 | AddResult | MinusResult | MultiplyResult | DivideResult |
+---------+---------+-----------+-------------+----------------+--------------+
|      40 |      20 |      NULL |        NULL |           NULL |         NULL |
+---------+---------+-----------+-------------+----------------+--------------+
1 row in set (0.00 sec)

Following is the query to execute operations like plus, minus, multiply and divide while using UPDATE in MySQL −

mysql> update DemoTable set AddResult=(Number1+Number2);
Query OK, 1 row affected (0.22 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> update DemoTable set MinusResult=(Number1-Number2);
Query OK, 1 row affected (0.08 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> update DemoTable set MultiplyResult=(Number1*Number2);
Query OK, 1 row affected (0.08 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> update DemoTable set DivideResult=(Number1/Number2);
Query OK, 1 row affected (0.07 sec)
Rows matched: 1 Changed: 1 Warnings: 0

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+---------+---------+-----------+-------------+----------------+--------------+
| Number1 | Number2 | AddResult | MinusResult | MultiplyResult | DivideResult |
+---------+---------+-----------+-------------+----------------+--------------+
|      40 |      20 |        60 |          20 |            800 |            2 |
+---------+---------+-----------+-------------+----------------+--------------+
1 row in set (0.00 sec)