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How can we sort a query using ORDER BY CASE WHEN REGEXP?
Use regular expression along with CASE statement. Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Value varchar(20) ); Query OK, 0 rows affected (0.66 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Value) values('101');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(Value) values('P');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable(Value) values('A');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(Value) values('53');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(Value) values('R');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(Value) values('C');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(Value) values('190');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+-------+ | Id | Value | +----+-------+ | 1 | 101 | | 2 | P | | 3 | A | | 4 | 53 | | 5 | R | | 6 | C | | 7 | 190 | +----+-------+ 7 rows in set (0.00 sec)
Following is the query to sort a query with ORDER BY CASE −
mysql> SELECT Id, Value FROM DemoTable ORDER BY CASE WHEN Value REGEXP '[a-zA-Z]' THEN 0 ELSE 0+Value END ASC, Value;
This will produce the following output −
+----+-------+ | Id | Value | +----+-------+ | 3 | A | | 6 | C | | 2 | P | | 5 | R | | 4 | 53 | | 1 | 101 | | 7 | 190 | +----+-------+ 7 rows in set (0.06 sec)
Updated on: 30-Jul-2019
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