Sql recursion without recursion

Question

I have four tables

create table entities{
integer id;
string name;
}

create table users{
integer id;//fk to entities
string email;
}

create table groups{
i         


        

Answer 1

If you want a truly theoretically infinite level of nesting, then recursion is the only option, which precludes any sane version of SQL. If you're willing to limit it, then there are a number of other options.

Check out this question.