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Editorial Team
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Asked: 2026-05-31T00:12:40+00:00

I have MySQL table products , which has url and url_crc fields. I have

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I have MySQL table products, which has url and url_crc fields. I have incorrect CRC32 calculating at the time of insert.

INSERT INTO products (url, url_crc) VALUES
(‘http://www.zappos.com/product/7859366/color/106’,
CRC32(‘http://www.zappos.com/product/7859366/color/106’))

Result is:
http://www.zappos.com/product/7859366/color/106, 2147483647

But when i do this:

SELECT CRC32(‘http://www.zappos.com/product/7859366/color/106’)

Result is: 2838206275

Why is this happen ? 2838206275 != 2147483647.

Triggers didn’t help. Result is the same.

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1 Answer

  1. Editorial Team

    The maximum value of a 32 bit signed integer is 2^31-1.

    2838206275 is greater than that.

    (2147483647 is conveniently 2^31-1).

    In other words, use a larger data type (bigint).

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