單項(xiàng)選擇題

Which /SQL*Plus feature can be used to replace values in the WHERE clause?（）

A. Substitution variables
B. Replacement variables
C. Prompt variables
D. Instead-of variables
E. This feature cannot be implemented through /SQL*Plus

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單項(xiàng)選擇題

Examine the description of the MARKS table:

SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects.
Examine this SELECT statement based on the MARKS table:

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.

單項(xiàng)選擇題