Comparing binary values in MySQL

问题

Say you have two binary values

001011 
001111

How can you get the number of different bits in MySQL? I tried

SELECT BIT_COUNT(BINARY  001011 ^ BINARY 001111)

This returns 6, while I need a solution that returns 1 in this example.

回答1:

SELECT BIT_COUNT( CONV( '001011', 2, 10 ) ^ CONV( '001111', 2, 10 ) )

回答2:

SELECT BIT_COUNT(b'001011' ^ b'001111');

回答3:

It's converting the numbers 1011 and 1111 (base 10) to binary and doing the comparison. If you did:

SELECT BIT_COUNT(11 ^ 15)

It'd work.

来源：https://stackoverflow.com/questions/7111728/comparing-binary-values-in-mysql