To get the max value, use the max() function. Let us create a table first −
mysql> create table findMaxValueInVarcharField -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Value varchar(200) -> ); Query OK, 0 rows affected (1.09 sec)
Following is the query to insert some records in the table using insert command −
mysql> insert into findMaxValueInVarcharField(Value) values('200'); Query OK, 1 row affected (0.14 sec) mysql> insert into findMaxValueInVarcharField(Value) values('1000'); Query OK, 1 row affected (0.25 sec) mysql> insert into findMaxValueInVarcharField(Value) values('899474'); Query OK, 1 row affected (0.18 sec) mysql> insert into findMaxValueInVarcharField(Value) values('39474'); Query OK, 1 row affected (0.15 sec) mysql> insert into findMaxValueInVarcharField(Value) values('4958'); Query OK, 1 row affected (0.12 sec)
Following is the query to display all records from the table using select statement −
mysql> select * from findMaxValueInVarcharField;
This will produce the following output −
+----+--------+ | Id | Value | +----+--------+ | 1 | 200 | | 2 | 1000 | | 3 | 899474 | | 4 | 39474 | | 5 | 4958 | +----+--------+ 5 rows in set (0.00 sec)
Following is the query to get the maximum from numeric values in a varchar field −
mysql> select max(cast(Value as unsigned) ) AS MaximumValueFromVarcharField from findMaxValueInVarcharField;
This will produce the following output −
+------------------------------+ | MaximumValueFromVarcharField | +------------------------------+ | 899474 | +------------------------------+ 1 row in set (0.00 sec)