Cast from VARCHAR to INT - MySQL

My Current Data for

SELECT PROD_CODE FROM `PRODUCT` 

is

PROD_CODE 2 5 7 8 22 10 9 11 

I have tried all the four queries and none work. (Ref)

SELECT CAST(PROD_CODE) AS INT FROM PRODUCT; SELECT CAST(PROD_CODE AS INT) FROM PRODUCT; SELECT CAST(PROD_CODE) AS INTEGER FROM PRODUCT; SELECT CAST(PROD_CODE AS INTEGER) FROM PRODUCT; 

All throw syntax errors such as below:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') AS INT FROM PRODUCT LIMIT 0, 30' at line 1

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTEGER) FROM PRODUCT LIMIT 0, 30' at line 1

What is the right syntax to cast varchar to integer in MySQL?

MySQL Version: 5.5.16

2 Answers

As described in Cast Functions and Operators:

The type for the result can be one of the following values:

• BINARY[(N)]
• CHAR[(N)]
• DATE
• DATETIME
• DECIMAL[(M[,D])]
• SIGNED [INTEGER]
• TIME
• UNSIGNED [INTEGER]

Therefore, you should use:

SELECT CAST(PROD_CODE AS UNSIGNED) FROM PRODUCT 

For casting varchar fields/values to number format can be little hack used:

SELECT (`PROD_CODE` * 1) AS `PROD_CODE` FROM PRODUCT`