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...R sid bid day example instances v we will use these s sname rating age sql queries programming of the dustin sailors and triggers reserves relations lubber in our examples rusty if key for relation contained only yuppy attributes how would guppy semantics differ csc introduction to databases a vaisman select target list basic query from conceptual evaluation strategy where qualification vrelation names possibly with an defined terms range variableafter each name following vtarget compute cross product discard resulting tuples they fail qualifications vqualification comparisons attrop const or attr op delete that are not is one like distinct specified eliminate duplicate rows combined using vthis probably least efficient way distinctis optional keyword indicating optimizer find more answer should contain duplicates default strategies same answers eliminated based on variable b andr c x note variables who ve reserved at boat vreally needed appears twice fromclause previous can also be wr...