1z0-071 VCE Exam Download

To calculate the length of employment, you would compare the current date to the HIRE_DATE and calculate the difference in years.

A. This is the correct answer. The expression calculates the number of days between the current date (SYSDATE) and the HIRE_DATE, then divides by 365 to convert it to years, and checks if it is greater than 5.

B. SYSTIMESTAMP includes a time component including fractional seconds and time zone information, making this comparison incorrect.

C. There are typos in this option (CUARENT_DATE should be CURRENT_DATE and hire_data should be hire_date). Even with the correct function and column names, CURRENT_DATE returns the current date in the session time zone, not in years.

D. There are typos in this option (SYSNAYW should be SYSDATE). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.

E. This is a repetition of option D with the same issues.

F. There are typos in this option (CUNACV_DATE should be CURRENT_DATE and hire_data should be hire_date). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.

References:

Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Date Functions"

The COUNT function is one of the most commonly used aggregate functions in SQL for determining the number of items in a group. Here's why the correct answers are B and C:

A: Incorrect. COUNT can be used with any data type, not just NUMBER. It counts rows without regard to data type.

B: Correct. COUNT(DISTINCT inv_amt) counts the number of unique non-null values in the column inv_amt. It excludes duplicates and ignores NULL values.

C: Correct. COUNT(*) counts all rows in a table, including those with duplicates and those with NULLs in any column. It is a total row count regardless of content.

D: Incorrect. You can use a WHERE clause with COUNT. The WHERE clause filters rows before counting, which is standard in SQL.

E: Incorrect. COUNT(inv_amt) counts the rows where inv_amt is not NULL. Rows with NULL in the inv_amt column are not counted.

The CONCAT function and FLOOR function in Oracle SQL have specific behaviors:

A. CONCAT function joins two or more character strings into one string, making this statement true.

B. FLOOR function returns the largest integer that is less than or equal to the specified number, making this statement true.

C. While CONCAT can join two strings together, this statement is incomplete as it can join more than two.

D. INSTR can find the offset of a substring within a string, not just a single character.

E. INSTR starts searching the string from position 1 in Oracle SQL, not position 0.

F. FLOOR does return the largest integer less than or equal to the specified number, but it can be any integer, not just positive ones.

References:

Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Single-Row Functions"

For creating tables and utilizing sequences in Oracle 12c SQL, certain rules apply:

Option A: This statement is valid. It creates a table with a primary key and dates, where the default value for end_date is SYSDATE. There are no constraints on sequences, and all syntax is correct.

Option B: This option is invalid because it attempts to use CURRVAL of a sequence as a default value for a primary key. CURRVAL cannot be used until the sequence's NEXTVAL has been called in the session.

Option C: Invalid syntax because 'start date' is not a recognized default expression in Oracle SQL. If the intention was to use 'start_date' as a reference, it still would not work correctly without proper syntax for conditional default values.

Option D: This syntax is invalid in Oracle SQL because the DEFAULT clause does not support relational conditions directly within the table definition.

Option E: Valid. It correctly uses NEXTVAL for a sequence in the DEFAULT clause for the primary key, ensuring that each new record has a unique primary key generated from the sequence. The start_date and end_date are assigned defaults of SYSDATE, which is syntactically correct.