当前位置：优技教育 >> ocp考试 >

ocp 11g认证题库大全：1Z0-051-111题

来源：优技教育更新时间：2016/8/5 14:42:07 阅读次数：907

ocp 11g认证题库大全：1Z0-051-111题，完整题库请点击这里联系老师咨询了解

111. View the Exhibit and examine the structure of the CUSTOMERS table.

Which statement would display the highest credit limit available in each income level in each city in the

CUSTOMERS table?

A. SELECT cust_city, cust_income_level, MAX(cust_credit_limit )

FROM customers

GROUP BY cust_city, cust_income_level, cust_credit_limit;

B. SELECT cust_city, cust_income_level, MAX(cust_credit_limit)

FROM customers

GROUP BY cust_city, cust_income_level; 分组先按照city再按照income level

C. SELECT cust_city, cust_income_level, MAX(cust_credit_limit)

FROM customers

GROUP BY cust_credit_limit, cust_income_level, cust_city ; 顺序错了

D. SELECT cust_city, cust_income_level, MAX(cust_credit_limit)

FROM customers

GROUP BY cust_city, cust_income_level, MAX(cust_credit_limit);

Answer: B

试题解析：

按照题意，先按照每个城市后按照每个城市中的收入水平来分组查看最高的credit limit

故在group by时应为 group by cust_city, cust_income_level;

A答案，没有涉及到cust_credit_limit的分组。

B答案与题意相符，正确，数据太多，取前5行。

C答案，没有涉及cust_credit_limit分组，且cust_income_level, cust_city 顺序错了，应为group by cust_city, cust_income_level;

D答案，语法错误

ORACLE授权认证机构CUUG: CUUG与ORACLE合作15年，是ORACLE金牌合作伙伴，连续多年处于行业领先；; CUUG与工信部人才交流中心合作，是工信人才指定的PostgreSQL数据库培训合作伙伴；; CUUG与阿里云、腾讯云、人大金仓、奥星贝斯等众多数据库厂商合作，开设数据库认证与培训课程；; CUUG与企业合作提供人才输送、定制化培训、技术支持服务；

北京优技教育科技有限公司

联系电话：010-59426307

课程咨询：010-59426319

联系地址：海淀区紫竹院路88号

Oracle认证 OCP认证 OCM认证