How to change order of items in MySQL?

To change order of items in MySQL, use ORDER BY alias name. Let us first create a table −

mysql> create table DemoTable653 (Product1Amount int,Product2Amount int); Query OK, 0 rows affected (0.42 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable653 values(400,250); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable653 values(500,300); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable653 values(40,400); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable653 values(200,450); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable653 values(50,20); Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable653;

This will produce the following output −

+----------------+----------------+ | Product1Amount | Product2Amount | +----------------+----------------+ |            400 |            250 | |            500 |            300 | |            40  |            400 | |            200 |            450 | |            50  |             20 | +----------------+----------------+ 5 rows in set (0.00 sec)

Following is the query to change the order of items and display the difference −

mysql> select Product1Amount,Product2Amount,(Product1Amount-Product2Amount) as ProductAmountDifference from DemoTable653 order by ProductAmountDifference;

This will produce the following output −

+----------------+----------------+-------------------------+ | Product1Amount | Product2Amount | ProductAmountDifference | +----------------+----------------+-------------------------+ | 40             |            400 |                    -360 | | 200            |            450 |                    -250 | | 50             |             20 |                      30 | | 400            |            250 |                     150 | | 500            |            300 | 200 | +----------------+----------------+-------------------------+ 5 rows in set (0.29 sec)