ocp-051-3

一、原题

You need to extract details of those products in the SALES table where the PROD_ID column contains the string '_D123'. Which WHERE clause could be used in the SELECT statement to get the required output? A. WHERE prod_id LIKE '%_D123%' ESCAPE '_' B. WHERE prod_id LIKE '%\_D123%' ESCAPE '\' C. WHERE prod_id LIKE '%_D123%' ESCAPE '%_' D. WHERE prod_id LIKE '%\_D123%' ESCAPE '\_'

         答案 B 二、题目翻译      要从SALES表中提取出PROD_ID列包含'_D123'字符串的产品明细。      下面哪一个WHERE条件子句可以获得所需的输出结果？ 三、题目解析       ESCAPE子句为指定转译字符，因为'_'下画线在LIKE子句中指的是任意一个字符，所以需要把'_'下画线进行转义，转义字符设置为'\'。