Only attach one side before adding your bottom shelf, and you want to be sure to attach your top runner with pocket hole screws before attaching it to your table base. (shanty-2-chic.com)
Before assembling the legs, drill pocket holes for 3/4 ″ wide material in the top of the legs and leg sides. (housefulofhandmade.com)
I used pocket holes on the back of the plywood that go into the 4 × 4 legs, and long pocket screws. (hazelandgolddesigns.com)