【单选题】【消耗次数：1】
索引字段不唯一，应该选用怎么样的索引类型()。
①
主索引
②
普通索引
③
候选索引
④
唯一索引
参考答案：
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相关题目
【简答题】
在Visual FoxPro中通过建立主索引或候选索引来实现[填空1]完整性约束。
【单选题】
关于索引的说法，正确的是（ ）。
①
只要建立了索引就可以加快数据的查询效率
②
在一个表上可以创建多个聚集索引
③
在一个表上可以建立多个唯一的非聚集索引
④
索引会影响数据插入和更新的执行效率，但不会影响删除数据的执行效率
随机题目
【单选题】
We’ve _______ paper and ink. Ask Mr. Howard to lend us some.
①
run away with
②
run down
③
run off
④
run out of
【单选题】
How do I get to the cinema?____________
①
Its very far.
②
Yes, there is a cinema near here.
③
Its well known.
④
Go down this street and turn left.
【单选题】
I doubt whether the Chinese Football Team can win the game this time.____________
①
That’s true.
②
It’s hard to say.
③
I like the team.
④
I don’t believe it.
【判断题】
判断线上的内容是否正确：She is under the impression that he isn’t a __genuine____ person for he wouldn’t tell her where and when he went to university.
①
正确
②
错误
【判断题】
判断线上的内容是否正确：When the post fell ___vacant___.Dennis Bass was appointed to fill it.
①
正确
②
错误
【单选题】
Although they had suffered heavy losses, they refused to ____ defeat.
①
concede
②
conserve
③
assert
④
conceal
【单选题】
He departed ____ to catch the train only to find his ticket was left in home.
①
in hurry
②
in haste
③
in a haste
④
with haste
【单选题】
After so many years, he still ____ the hope that his lost son would return one day.
①
clang to
②
clung to
③
inclined to
④
subjected to
【单选题】
Hi, Peter, how is everything with you?____________
①
Don’t mention it.
②
Pretty fast.
③
Thanks.
④
Hm, not too bad.