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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) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: SELECT subj1+subj2 total_marks, std_id FROM marks WHERE subj1 > AVG(subj1) AND subj2 > AVG(subj2) ORDER BY total_marks; What is the result of the SELECT statement?（）
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.

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出自：Oracle认证

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