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Ordering string as a number in a database?
To order string as a number, use CAST(). Following is the syntax −
select *from yourTableName ORDER BY CAST(yourColumnName AS SIGNED) DESC;
Let us first create a table −
mysql> create table DemoTable ( Id varchar(100) ); Query OK, 0 rows affected (0.18 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('3');
Query OK, 1 row affected (0.07 sec)
mysql> insert into DemoTable values('20');
Query OK, 1 row affected (0.07 sec)
mysql> insert into DemoTable values('34');
Query OK, 1 row affected (0.06 sec)
mysql> insert into DemoTable values('21');
Query OK, 1 row affected (0.06 sec)
mysql> insert into DemoTable values('78');
Query OK, 1 row affected (0.04 sec)
mysql> insert into DemoTable values('90');
Query OK, 1 row affected (0.07 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+------+ | Id | +------+ | 3 | | 20 | | 34 | | 21 | | 78 | | 90 | +------+ 6 rows in set (0.00 sec)
Following is the query to ordering integer numbers −
mysql> select *from DemoTable ORDER BY CAST(Id AS SIGNED) DESC;
This will produce the following output −
+------+ | Id | +------+ | 90 | | 78 | | 34 | | 21 | | 20 | | 3 | +------+ 6 rows in set (0.02 sec)
Updated on: 30-Jul-2019
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