1 votes 1 votes how to read/breakdown/understand this query? which part wil be solved first? {t∣t∈πR−S(r)∧∀u∈s(∃v∈r(u=v[S]∧t=v[R−S]))} Databases databases relational-calculus tuple-relational-calculus + – iarnav asked Dec 2, 2017 iarnav 311 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.