toronto is the biggest city and the capital of canada. ()

toronto is the biggest city and the capital of canada. ()


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设有关系R(CITY,ST,ZIP),其函数依赖集F = {(CITY,ST)? ZIP,ZIP ? CITY },则关系R至多满足A.1NFB.2NFC.3NFD.BCNF

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One goal of many Americans and Canadians is to move out of a busy urban area such as().A、New YorkB、LondonC、L.A.D、Toronto

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关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)+ZIP, ZIP→CITY},关系模式CSZ的主属性是A.ZIPB.CITY,ST,ZIPC.CITY,ZIPD.ST,ZIP

关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)→ZIP, P→CITY},关系模式CSZ的主属性是A.ZIPB.CITY,ST,ZIPC.CITY,ZIPD.ST,ZIP

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Who is the head of this delegation?A: captainB: leaderC: bestD: capital

capital的复数为