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I think I need to use Bitwise with MySQL.
However, I’m confused with
SELECT 29 | 15;
returns
31
http://dev.mysql.com/doc/refman/5.0/en/bit-functions.html
I have been reading what I can understand about bitwise but I’m lost.
Well, in 29, the bits 16, 8, 4, and 1 are set.
In 15, the bits 8, 4, 2, and 1 are set.
“x Or y” (|) means: “set all bits that are set in x or y or both”.
So, in 29 | 15, bits 16, 8, 4, 2, and 1 are all set.
16 + 8 + 4 + 2 + 1 = 31.
Does this answer your question?