A、in
B、into
C、to
D、toward
第1题:
下列字符型常量Hello,world!表示方法中,错误的是______。
A.[Hello,world!]
B.'Hello,wOrld!'
C.Hello,world!,
D.{Hello,world!}
第2题:
The book has been translated into thirty languages since it _____on the market in 1973.
A.had come
B. has come
C. came
D.comes
第3题:
要查看stats包中的数据集trees的前10行数据的命令是
A.trees(1:10)
B.trees(1:10,)
C.trees[1:10]
D.trees[1:10,]
第4题:
Given the following DDL for the PARTS table:CREATE TABLE parts (part_no INT(9) NOT NULL, part_name VARCHAR(24), part_remain INT(9));All part numbers entered will be different and all rows should be displayed in order of increasing part numbers whenever the table is queried. Which of the following create index statements will meet this criteria and require the least amount of storage for the index object?()
A.CREATE UNIQUE INDEX idx_partno ON parts(part_no)
B.CREATE UNIQUE INDEX idx_partno ON parts(part_name ASC)
C.CREATE UNIQUE INDEX idx_partno ON parts(part_name, part_no ASC)
D.CREATE UNIQUE INDEX idx_partno ON parts(part_no, part_name ASC)
第5题:
第6题:
要查看stats包中的数据集trees的某一列数据,比如仅查看Girth列的命令是
A.trees$Girth
B.trees[Girth]
C.trees(Girth)
D.trees.Girth