How to add cascade delete in oracle when the foreign key is on the same table?

I can't recall if this will work or not, but my first impulse is to say set parent_id=NULL for the root.

Oh sure...post the answer right after I figure it out and right before I post it ;) – testing123 Apr 7 at 23:53.

Figured it out. The key (no pun intended) is to make your parent_id nullable and then set your root to be null.

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