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
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
对于将varchar字段/值转换为数字格式,可以使用少量hack:
SELECT (`PROD_CODE` * 1) AS `PROD_CODE` FROM PRODUCT`
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