Symmetric cross join

Question

I\'m tryng to extract all pair say i,j from each element in a table against each element on the same table, here my query:

select a.Id L,b.id R into         


        

Answer 1

So, just condition the join so that the left side is always equal to or lesser!

    select a.Id L,b.id R
      into #cross
      from MyTable a
inner join mytable b on a.id <= b.id