下列命令中,仅拷贝表文件结构的命令是______。
A. COPY TO
B. COPY STRUCTURE TO
COPY STRUCTURE TO
D. COPY STRUCTURE TO EXETENDE
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Unless Jessica finishes inputting her documents by 2:00, there is no chance she will ______ the project deadline.
A. (A) meet
B. (B) fulfill
C. (C) arrive
D. (D) accomplish
对数据元素序列(49,72,68,13,38,50,97,27) 进行排序,前三趟排序结束时的结果依次为:第一趟:13,72,68,49,50,97,27;第二趟:13,27,68,49,38,50,97,72;第三趟:13,27,38,49,68,50,97,72。该排序采用的方法是______。
A. 插入排序法
B. 选择排序法
C. 冒泡排序法
D. 快速排序法
检索学生姓名及其所选修课程的课程号和成绩。正确的SELECT语句是______。
A. SELECT S.SN,SC.C#,SC.CRADE
B. FROMS
C. WHERE S.S#=SC.S#
D. SELCECT S.SN,SC.C#,SC.GRADE
E. FROM SC
F. WHERE S.S#=SC.CRADE
G. SELECT S.SN,SC.C#,SC.CRADE
H. FROM S,SC
I. WHERE S.S#:SC.S#
J. ) SELSECT S.SN,SC.C#,SC.
Due to the rising costs, starting July, the yearly ______ to this sports magazine will increase from $100 to $120.
A. (A) subscription
B. (B) description
C. (C) prescription
D. (D) inscription