lol, tnx, i total forgot on IN(),

Firstly i was looked a way to compare two array srings eg. 2,4,6,9 compare with 5,3,2,4,7,8, but i cant find way to do that, so i add just one value in field and i just continue to write and forgot IN(), if u have any suggestion on how to compare 2 different array please write, (it will be a case when these 2 arrays wouldnt have same number of values inside, eg. 3,4,5 and 5,6,4,2 - in 1 array we have 3 values and in sec. we have 4.)