OCP认证是Oracle非常重要的一个认证，对于11g版本来说，考试科目为071、052、053，对于12c版本来说，考试科目为071、062、063，可见071是个很重要的考试，这里我们收集了近期071考试的原题，分享给大家。
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071考题整理-第23题、choose the best answer:
You need to display the first names of all customers from the CUSTOMERS table that contain the character 'e' and have the character 'a' in the second last position.
Which query would give the required output?
A) SELECT cust_first_name
FROM customers
WHERE INSTR(cust_first_name, 'e')<>'' AND
SUBSTR(cust_first_name, -2, 1)='a';
B) SELECT cust_first_name
FROM customers
WHERE INSTR(cust_first_name, 'e')<>0 AND
SUBSTR(cust_first_name, -2, 1)='a';
C) SELECT cust_first_name
FROM customers
WHERE INSTR(cust_first_name, 'e')<>0 AND
SUBSTR(cust_first_name, LENGTH(cust_first_name),-2)='a';
D) SELECT cust_first_name
FROM customers
WHERE INSTR(cust_first_name, 'e')IS NOT NULL AND
SUBSTR(cust_first_name, 1,-2)='a';
Answer:B
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