Los Angeles
Houston
Boston
Honolulu
第1题:
Why did American city residents want to live in the suburbs after World War Ⅱ?
A. Because older American cities were dying.
B. Because they were richer and needed more space.
C. Because cities contained the wont pare of society.
D. Because they could hardly afford a live in the city.
第2题:
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.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP
第3题:
此题为判断题(对,错)。
第4题:
第5题:
A.a big city...the countryside
B.a small town...a small village
C.a big city...a small village
D.the countryside...a big city
第6题:
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.1NF
B.2NF
C.3NF
D.BCNF
第7题:
City born and city bred, he always thinks city life is () coutry life.
A、superior than
B、inferior than
C、superior to
D、inferior to
第8题:
A.ity=null
B.city=‘null‘
C.city is null
D.city is ‘null‘
第9题:
“找出北京供应商的所有信息”的SELECT语句是
A.SELECT*FROM S WHERE CITY='京'
B.SELECT SNO,SNAME FROM S WHERE CITY='北京'
C.SELECT*FROM S WHERE CITY=北京
D.SELECT SNO,SNAME FROM S WHERE CITY=北京
第10题: