Phantom Read definition inconsistencies

[avzh1]

[OliverKillane]

Will improve the definition -> though I need to read a bit more (SELECT .. WHERE ... changing implies a tuple was changed -> non-repeatable read, but the bag of tuples returned has changed -> phantom read? This is a hard one)

I will overhaul transactions post-exams and get official answers on this. Currently the definitions feel hazy at best.