MySQL IF/WHEN/ELSE/OR with ORDER BY FIELD

Let us first create a table −

mysql> create table DemoTable1884
   (
   Marks int
   );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1884 values(55);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1884 values(97);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1884 values(79);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1884 values(87);
Query OK, 1 row affected (0.00 sec)

Display some records in the table using insert command −

mysql> select * from DemoTable1884;

This will produce the following output −

+-------+
| Marks |
+-------+
|    55 |
|    97 |
|    79 |
|    87 |
+-------+
4 rows in set (0.00 sec)

Here is the query to implement order by field() with OR:

mysql> select * from DemoTable1884 where Marks = 98 or Marks = 87 order by field(Marks,98,87) limit 1;

This will produce the following output −

+-------+
| Marks |
+-------+
|    87 |
+-------+
1 row in set (0.00 sec)