当前位置: Oracle DBA培训网-优技培训 >> 071题库 >

【071题库】最新OCP-071考试题库解析-第4题

【071题库】最新OCP-071考试题库解析-第4题

071考试是OCP考试科目的一种,由于071考题多变,我们专门收集整理了最新的考试题库,并对这些考题进行讲解,希望可以帮助广大考生。

每周五晚8点,我们有免费的OCP解析公开课,地址:https://ke.qq.com/course/326223  OCP题库交流群:1015267481,验证ocp

-------------------------------------------------------

071题库-第4题、choose the best answer

View the Exhibits and examine PRODUCTS and SALES tables.

You issue the following query to display product name and the number of times the

product has been sold:

SQL>SELECT p.prod_name, i.item_cnt

FROM (SELECT prod id, COUNT(*) item_cnt

FROM sales GROUP BY prod_id) i RIGHT OUTER JOIN products p

ON i.prod_id = p.prod_id;


What happens when the above statement is executed?

A) The statement executes successfully and produces the required output.

B) The statement produces an error because a subquery in the FROM clause and outer-joins cannot be used together.

C) The statement produces an error because ITEM_CNT cannot be displayed in the outer query.

D) The statement produces an error because the GROUP BY clause cannot be used in a subquery in the FROM clause.

Answer:A

(SQL> select d.dname,e.emp_cnt

from (select deptno,count(*) emp_cnt from emp group by deptno)e right outer join dept d

on e.deptno=d.deptno;

DNAME EMP_CNT

-------------- ----------

ACCOUNTING 2

RESEARCH       4

SALES              6

OPERATIONS

TRAIN)

技术沙龙MORE+

Oracle技术沙龙:【数据保护顶尖技术-MAA】首次全国首播12c MAA技术 云数据库加上MAA技术组成最豪华的技...
Oracle技术沙龙第49期:【Oracle 数据库云技术分享】Oracle技术沙龙第49期:【Oracle 数据库云技术分享】本次技术沙...
Oracle技术沙龙第48期:【Oracle 12c RAC安装】小编:今天讲什么内容呢?以后有什么用呢? 大师:今天讲的是12c...
我要参加技术沙龙