MySQL returning different values for CRC32() with same string

Question

I am having a bizarre issue with two queries returning different hash values for CRC32 with the same string.

If I run:

SELECT 'http://mywebsite4.com/myvideos', CRC32('http://mywebsite4.com/myvideos');

The hash values returned are 3769016377.

If I then run

INSERT INTO locations (full_url, full_url_hash) VALUES ('http://mywebsite4.com/myvideos', CRC32('http://mywebsite4.com/myvideos'))

The hash values inserted are 2147483647.

Is there something obvious that I'm missing here? As far as I understand the CRC32 function should always hash equal strings to equal 32 bit integers, I can't for the life of me figure out why they're different in this case.

Thanks!

Answer 1

Change your datatype of the column into INT UNSIGNED. The reason for that is you are using SIGNED INT that's why the maximum value is only 2147483647.

CREATE TABLE tableNAME
(
    full_url_hash INT UNSIGNED
    -- other columns
)

• SQLFiddle Demo