Hey this is much appreciated but you missed the mark on this one unfortunately. In MySQL the sets can either be inserted by name or by inserting a number that corresponds to the numeric value given that element that is in the set. For example:

In a table I have a field of type SET that is defined this way:

"Dog","Cat","Bird","Reptile","Horse","Fish"

MySQL allows you to either insert the set as one or many of the elements.

A person says they have a Dog, Cat and a Fish. So it can be inserted as a list: 'Dog','Cat','Fish'

The other way it can be inserted is by a number that represents the binary value. MySQL assigns a numberic value to each of the set's elements like so:

"Dog" => 1, "Cat" => 2, "Bird" => 4, "Reptile" => 8, "Horse" => 16, "Fish" => 32

Basically it's like a bit flag. MySQL allows up to 64 elements in a set. So if I were to insert by number I would add up the values for the elements. 1+2+4 = 7, when you insert 7, MySQL takes it as inserting 'Dog','Cat','Bird'. It's like using a binary flag.

BMaximus

In reply to Re^2: Flipping bits and using flags by BMaximus
in thread Flipping bits and using flags by BMaximus

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