julvr wrote:
I'm making a table (you can see my previous post), the top of which
will be plywood bordered with solid oak. Now, plywood does not
expand or contract, but oak will. The table is 40" long -- If I
attach a solid oak border (the border will be a 3/4"x3.5"x40", where
the 3/4" side is facing upwards and is flush with the plywood).
What's the best way to attach the border such that I minimize
cracking and warping?

Biscuits, pocket screws, splines, even glue alone should be fine.

Wood doesn't move much in the directions you're worried about.

Barry