2018年的OCP 11g题库解析暂告一段落,关于12c的OCP解析公开课正在进行中,课程包括071、062、063三个科目,这里为您带来的是最新版的071考试题库解析,帮大家顺利通过OCP的071考试。
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071考题大全-第48题、choose the best answer
View the Exhibit and examine the description for the PRODUCTS and SALES table.
PROD_ID is a primary key in the PRODUCTS table and foreign key in the SALES table with ON DELETE CASCADE option. The SALES table contains data for the last three years. You want to remove all the rows from the PRODUCTS table for which no sale was done for the last three years.
Which is the valid DELETE statement?
A) DELETE
FROM products
WHERE prod id IN (SELECT prod_id
FROM sales
where time_id >= SYSDATE - 3*365 );
B) DELETE
FROM products
WHERE prod_id = (SELECT prod_id
FROM sales
WHERE time_id - 3*365 = SYSDATE );
C) DELETE
FROM products
WHERE prod_id = (SELECT prod_id
FROM sales
WHERE SYSDATE >= time_id - 3*365 );
D) DELETE
FROM products
WHERE prod_id IN (SELECT prod_id
FROM sales
where SYSDATE - 3*365 >= time_id);
Answer:A
(解析:time_id >= SYSDATE - 3*365 最近三年的时间
SYSDATE - 3*365 >= time_id 三年以前的时间
原来 051 的题
)
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