Maintain the custom order of the IDs passed in MySQL

MySQLMySQLi Database

To maintain the custom order of IDs, use ORDER BY CASE statement. Let us first create a table −

mysql> create table DemoTable1550
   -> (
   -> Id int,
   -> Name varchar(20)
   -> );
Query OK, 0 rows affected (0.61 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1550 values(101,'Chris');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1550 values(110,'Bob');
Query OK, 1 row affected (0.29 sec)
mysql> insert into DemoTable1550 values(105,'Carol');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1550 values(109,'Mike');
Query OK, 1 row affected (0.17 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1550;

This will produce the following output −

+------+-------+
| Id   | Name  |
+------+-------+
|  101 | Chris |
|  110 | Bob   |
|  105 | Carol |
|  109 | Mike  |
+------+-------+
4 rows in set (0.00 sec)

Here is the query to maintain the order of the IDs passed −

mysql> select * from DemoTable1550
   -> where Id IN(109,101,110)
   -> order by case Id
   -> when 109 then 1001
   -> when 101 then 1002
   -> when 110 then 1003
   -> end;

This will produce the following output −

+------+-------+
| Id   | Name  |
+------+-------+
|  109 | Mike  |
|  101 | Chris |
|  110 | Bob   |
+------+-------+
3 rows in set (0.00 sec)
raja
Published on 12-Dec-2019 06:22:53
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