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How to order by a custom rule like order like 4,2,1,3 in MySQL?
To order with a custom rule, use the ORDER BY FIELD(). Let us first create a table −
mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (0.55 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(4); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(2); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(3); Query OK, 1 row affected (0.14 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+--------+ | Number | +--------+ | 1 | | 4 | | 2 | | 3 | +--------+ 4 rows in set (0.00 sec)
Following is the query to ORDER BY custom rule, for example, 4,2,1,3 −
mysql> select *from DemoTable order by field(Number,4,2,1,3);
This will produce the following output with custom ordering −
+--------+ | Number | +--------+ | 4 | | 2 | | 1 | | 3 | +--------+ 4 rows in set (0.00 sec)
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