【简答题】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...
【单选题】Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine...
A.
The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.
B.
The statement returns an error at the SELECT clause.
C.
The statement returns an error at the WHERE clause.
D.
The statement returns an error at the ORDER BY clause.