How to convert Varchar to Double in SQL?
You can convert varchar to double using CAST() function. The syntax is as follows:
SELECT yourColumnName1,yourColumnName2,......N, CAST(yourColumnName AS DECIMAL(TotalDigit,DigitAfterDecimalPoint)) anyVariableName FROM yourtableName
ORDER BY anyVariableName DESC;
To understand the above syntax, let us create a table. The query to create a table is as follows:
mysql> create table VarcharToDouble
-> (
-> Id int NOT NULL AUTO_INCREMENT,
-> Name varchar(10),
-> Amount varchar(10) ,
-> PRIMARY KEY(Id)
-> );
Query OK, 0 rows affected (0.67 sec)
Insert some records in the table using insert command. The query is as follows:
mysql> insert into VarcharToDouble(Name,Amount) values('John','456.78');
Query OK, 1 row affected (0.14 sec)
mysql> insert into VarcharToDouble(Name,Amount) values('Larry','8465.98');
Query OK, 1 row affected (0.18 sec)
mysql> insert into VarcharToDouble(Name,Amount) values('Mike','9083.45');
Query OK, 1 row affected (0.12 sec)
mysql> insert into VarcharToDouble(Name,Amount) values('Sam','46475.50');
Query OK, 1 row affected (0.19 sec)
mysql> insert into VarcharToDouble(Name,Amount) values('Carol','10003.35');
Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement. The query is as follows:
mysql> select *from VarcharToDouble;
The following is the output:
+----+-------+----------+
| Id | Name | Amount |
+----+-------+----------+
| 1 | John | 456.78 |
| 2 | Larry | 8465.98 |
| 3 | Mike | 9083.45 |
| 4 | Sam | 46475.50 |
| 5 | Carol | 10003.35 |
+----+-------+----------+
5 rows in set (0.00 sec)
Here is the query to convert varchar to double using CAST():
mysql> select Id,Name, CAST(Amount AS DECIMAL(10,2)) TotalAmount from VarcharToDouble
-> order by TotalAmount desc;
The following is the output:
mysql> select Id,Name, CAST(Amount AS DECIMAL(10,2)) TotalAmount from VarcharToDouble
-> order by TotalAmount desc;
Published on 25-Feb-2019 14:54:15
