OCP-1Z0-051-V9.02-8题
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8. View the Exhibit and examine the structure of the CUSTOMERS table.
Which two tasks would require subqueries or joins to be executed in a single statement? (Choose two.)
A. listing of customers who do not have a credit limit and were born before 1980
B. finding the number of customers, in each city, whose marital status is 'married'
C. finding the average credit limit of male customers residing in 'Tokyo' or 'Sydney'
D. listing of those customers whose credit limit is the same as the credit limit of customers residing in the
city 'Tokyo'E. finding the number of customers, in each city, whose credit limit is more than the average credit limit of
all the customers
Answer: DE
答案解析:
参考:http://blog.csdn.net/rlhua/article/details/12879585
ABC不用子查询就可以查询出,题意选择两个,排除ABC,选择DE
A. 列出没有信贷限额并且1980年以前出生的客户。
SELECT 客户 from 表名 where 信贷限额 is null and 出生日期>1980;
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