题目内容

“沐皇恩贾家延世泽”，贾家要复兴，靠的是哪个人物？（）

A. 贾宝玉
B. 贾蓉
C. 贾琏
D. 贾兰

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Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ3 NUMBER(3) SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）

A. SELECT SUM(subj1, subj2, subj3) FROM marks;
B. SELECT SUM(subj1 + subj2 + subj3) FROM marks;
C. SELECT SUM(subj1), SUM(subj2), SUM(subj3) FROM marks;
D. SELECT MAX(subj1, subj2, subj3) FROM marks;
E. SELECT MINIMUM(subj1) FROM marks;
F. SELECT COUNT(std_id) FROM marks WHERE subj1 >= AVG(subj1)

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