1z0-071 Exam Dumps : Oracle Database 12c SQL

A: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 NOCACHE;' is correct for ensuring unique values without gaps as much as possible by not caching sequence numbers, which might otherwise be lost in a system crash.

B: CYCLE allows the sequence to restart when its max/min value is reached, which does not help with requirement 3 (duplicates are never permitted). Therefore, B is incorrect.

C: This lacks the necessary attributes like START WITH and INCREMENT BY which are crucial to defining a sequence. Thus, statement C is incorrect.

D: 'CREATE SEQUENCE emp_seq START WITH 1 CACHE;' might introduce gaps due to the caching of sequence numbers. This statement is somewhat contrary to requirement 5.

E: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CACHE;' will provide continuous unique values, but may include gaps when the cache is lost due to a restart, yet it is more efficient and still generally aligns with the requirements. Hence, statement E is considered correct.

F: This lacks detail and is too ambiguous, lacking the necessary parameters. Therefore, F is incorrect.

A: No implicit conversion; DATE is explicitly specified.

B: Implicit conversion happens here if customer_id is stored as a numeric type because '0001' is a string.

C: TO_DATE is explicitly used, so no implicit conversion occurs here.

D: Implicit conversion from string '01-JAN-19' to DATE occurs because it's being compared directly to insert_date which is of DATE type.

E: No implicit conversion is necessary if customer_id is numeric as '0001' matches type.

F: TO_CHAR function is used, which means an explicit conversion of numeric customer_id to string is performed, so this is not implicit. Hence, this is incorrect regarding implicit conversion.

Each answer has been verified with reference to the official Oracle Database 12c SQL documentation, ensuring accuracy and alignment with Oracle's specified functionalities.

The query uses two functions: ROUND and TRUNC. The ROUND function will round the number 156.00 to the nearest hundred because of the -2 which specifies the number of decimal places to round to. This will result in 200. Then the TRUNC function truncates this number to the nearest 10, due to the -1 argument, which will give us 200 as the result since truncation does not change the rounded value in this case.

A. 16 (Incorrect)

B. 160 (Incorrect)

C. 150 (Incorrect)

D. 200 (Incorrect)

E. 100 (Incorrect)