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Sorting a VARCHAR column as FLOAT using the CAST operator isn’t working in MySQL ?
If your cast does not work, then you can use yourColumnName*1 with ORDER BY clause.
Using yourColumnName*1. The syntax is as follows:
SELECT yourColumnName1,yourColumnName2,...N FROM yourTableName ORDER BY yourColumnName*1 DESC;
You can also use CAST() operator. The syntax is as follows:
SELECT yourColumnName1,yourColumnName2,...N FROM yourTableName ORDER BY CAST(yourColumnName as DECIMAL(8,2)) DESC;
To understand the above syntax, let us create a table. The query to create a table is as follows:
mysql> create table VarcharColumnAsFloatDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Amount varchar(20), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (1.01 sec)
Insert some records in the table using insert command. The query is as follows:
mysql> insert into VarcharColumnAsFloatDemo(Amount) values('3446.23');
Query OK, 1 row affected (0.10 sec)
mysql> insert into VarcharColumnAsFloatDemo(Amount) values('2464.46');
Query OK, 1 row affected (0.16 sec)
mysql> insert into VarcharColumnAsFloatDemo(Amount) values('6465.78');
Query OK, 1 row affected (0.13 sec)
mysql> insert into VarcharColumnAsFloatDemo(Amount) values('6464.98');
Query OK, 1 row affected (0.44 sec)
mysql> insert into VarcharColumnAsFloatDemo(Amount) values('645.90');
Query OK, 1 row affected (0.19 sec)
mysql> insert into VarcharColumnAsFloatDemo(Amount) values('6465.99');
Query OK, 1 row affected (0.23 sec)
mysql> insert into VarcharColumnAsFloatDemo(Amount) values('3745.76');
Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement. The query is as follows:
mysql> select *from VarcharColumnAsFloatDemo;
The following is the output:
+----+---------+ | Id | Amount | +----+---------+ | 1 | 3446.23 | | 2 | 2464.46 | | 3 | 6465.78 | | 4 | 6464.98 | | 5 | 645.90 | | 6 | 6465.99 | | 7 | 3745.76 | +----+---------+ 7 rows in set (0.00 sec)
Here is the query to sort varchar as float using cast operator:
mysql> select Id,Amount from VarcharColumnAsFloatDemo order by cast(Amount as DECIMAL(8,2)) DESC;
The following is the output:
+----+---------+ | Id | Amount | +----+---------+ | 6 | 6465.99 | | 3 | 6465.78 | | 4 | 6464.98 | | 7 | 3745.76 | | 1 | 3446.23 | | 2 | 2464.46 | | 5 | 645.90 | +----+---------+ 7 rows in set (0.00 sec)
The second approach is as follows using yourColumnName*1:
mysql> select Id,Amount from VarcharColumnAsFloatDemo order by Amount*1 desc;
The following is the output:
+----+---------+ | Id | Amount | +----+---------+ | 6 | 6465.99 | | 3 | 6465.78 | | 4 | 6464.98 | | 7 | 3745.76 | | 1 | 3446.23 | | 2 | 2464.46 | | 5 | 645.90 | +----+---------+ 7 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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