database测试笔试题1

2017-07-18 约 77 字预计阅读 1 分钟

can the value of primary key be NULL? no

答案：不行

Is the index used to improve the peformance? 答案：yes

答案：是

is the keyword “select distinct” used to group result-set by one or more columns? no

答案：不是

which keyword is used to sort the result-set? order by

答案： Order by

which keyword is used to modify the existing records in table? update

答案： update

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