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But as Josh says - there is a limit to the number of groups that somone can belong to. (I think the field limit is 255 - so 125 would be the maximum)
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I think, if I've figurd this right - if it's a varchar 255 field, then you could hold about 85 groups per user.
Figure most of the groups are double digits, then the dash. Because each group is listed in the U_Groups or Bo_Read fields like -10-11-15-18-20- So each group added uses 3 characters.
You could increase the field size, but there's a lot of searching by groups in those fields, so not sure if that would affect efficiency or not.
