MySQL query to increase item value price for multiple items in a single query?

To increase item value for multiple items in a single query, you can use the CASE statement in MySQL. Let us first create a table −

mysql> create table DemoTable
   -> (
   -> ProductName varchar(20),
   -> ProductPrice int
   -> );
Query OK, 0 rows affected (0.51 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Product-1',700);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values('Product-2',1000);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('Product-3',3000);
Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------------+--------------+
| ProductName | ProductPrice |
+-------------+--------------+
| Product-1   |          700 |
| Product-2   |         1000 |
| Product-3   |         3000 |
+-------------+--------------+
3 rows in set (0.00 sec)

Here is the MySQL query to increase item value price for multiple items −

mysql> update DemoTable
   -> set ProductPrice=
   -> case when ProductName='Product-1' then ProductPrice+((ProductPrice*20)/100)
   -> when ProductName='Product-2' then ProductPrice+((ProductPrice*40)/100)
   -> when ProductName='Product-3' then ProductPrice+((ProductPrice*60)/100)
   -> end;
Query OK, 3 rows affected (0.14 sec)
Rows matched: 3 Changed: 3 Warnings: 0

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+-------------+--------------+
| ProductName | ProductPrice |
+-------------+--------------+
| Product-1   |          840 |
| Product-2   |         1400 |
| Product-3   |         4800 |
+-------------+--------------+
3 rows in set (0.00 sec)