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MySQL | CRC32 method

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schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's CRC32(~) method computes a cyclic redundancy check value and returns a 32-bit unsigned value.

NOTE

Cyclic redundancy check is a technique used to detect accidental changes to raw data. A sequence of check bits are appended to the data to be transferred, which makes the resulting sequence exactly divisible by a pre-defined binary number. The recipient of this data will also perform division with the pre-defined binary number. If it does not have any remainder, the data is assumed to be intact.

Parameters

1. expr | string

The string to compute cyclic redundancy check value for.

Return value

A 32-bit unsigned cyclic redundancy check value.

Examples

Basic usage

To compute cyclic redundancy check value for 'hello':

SELECT CRC32('hello');
+----------------+
| CRC32('hello') |
+----------------+
| 907060870 |
+----------------+

Case sensitivity

The computation of cyclic redundancy check value is case sensitive:

SELECT CRC32('test'), CRC32('Test');
+---------------+---------------+
| CRC32('test') | CRC32('Test') |
+---------------+---------------+
| 3632233996 | 2018365746 |
+---------------+---------------+

Numbers are treated as a string

To compute cyclic redundancy check value for 30 and '30':

SELECT CRC32(30), CRC32('30');
+------------+-------------+
| CRC32(30) | CRC32('30') |
+------------+-------------+
| 2473281379 | 2473281379 |
+------------+-------------+

We can see that both inputs yield the same result.

NULL values

NULL inputs return NULL:

SELECT CRC32(NULL);
+-------------+
| CRC32(NULL) |
+-------------+
| NULL |
+-------------+
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Published by Arthur Yanagisawa
Edited by 0 others
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