OCP认证是Oracle非常重要的一个认证,对于11g版本来说,考试科目为071、052、053,对于12c版本来说,考试科目为071、062、063,可见071是个很重要的考试,这里我们收集了近期071考试的原题,分享给大家。
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071考题整理-第50题、choose two
Examine the structure of the MARKS table:
Which two statements would execute successfully?
A) SELECT SUM(subjectl+subject2+subject3)
FROM marks
WHERE student_name IS NULL;
B) SELECT SUM(DISTINCT NVL(subject1,0)), MAX(subjectl)
FROM marks
WHERE subjectl > subject2;
C) SELECT student_name,subjectl
FROM marks
WHERE subjectl > AVG(subjectl);
D) SELECT student_name, SUM (subjectl)
FROM marks
WHERE student_name LIKE 'R%';
Answer:AB
(解析:C 答案 where 子句中用到了 avg 函数,必须用 having;D 答案 student_name 没有在 group by 子句中出现。
B 答案可以写成如下方式运行:
SELECT SUM(DISTINCT NVL(comm,0)), MAX(sal)
FROM emp
WHERE sal > comm;
)
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