Oracle 1z0-071 Based on Real Exam Environment

The statement true regarding the CREATE TABLE command:

C. The NEW_SALES table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match: The SQL command tries to create a table with columns prod_id, cust_id, and order_date, but the SELECT statement specifies columns prod_id, cust_id, and time_id. The mismatch in column names and the number of columns specified will prevent the table from being created.

Incorrect options:

A: It is possible to specify a DEFAULT value in the column definition when creating a table with the CREATE TABLE AS SELECT syntax.

B: Not all NOT NULL constraints (or any other constraints, for that matter) are automatically passed to the new table unless explicitly stated in the CREATE TABLE statement.

D: FOREIGN KEY constraints are not automatically included when creating a table using the CREATE TABLE AS SELECT syntax; they would need to be added explicitly afterwards.

A: LAST_DAY does not only return the last day of the current month; it returns the last day of the month based on the date argument passed to it, which may not necessarily be the current month. Thus, statement A is incorrect.

B: CEIL requires a numeric argument and returns the smallest integer greater than or equal to that number. Thus, statement B is incorrect.

C: ADD_MONTHS function adds a specified number of calendar months to a date. This statement is correct as per the Oracle documentation.

D: ADD_MONTHS can work with a character string if the string can be implicitly converted to a DATE, according to Oracle SQL data type conversion rules. Therefore, statement D is correct.

E: LAST_DAY does not specifically return the last day of the previous month; it returns the last day of the month for any given date. Thus, statement E is incorrect.

F: CEIL returns the smallest integer greater than or equal to the specified number, not the largest integer less than or equal to it. Hence, statement F is incorrect.

G: LAST_DAY returns the last day of the month for the date argument passed to the function, which aligns with the definition in Oracle's SQL reference. Therefore, statement G is correct.

Analyzing the given SQL statements on the ORDER_ITEMS table:

D. Statement 2 may return multiple rows of output: Statement 2 groups the results by ORDER_ID, which means it calculates the maximum UNIT_PRICE * QUANTITY for each ORDER_ID, potentially returning multiple rows depending on the number of unique ORDER_IDs in the table.

E. Statement 1 returns only one row of output: Statement 1 computes the maximum product of UNIT_PRICE and QUANTITY across all entries in the ORDER_ITEMS table, returning a single row with the maximum value.

Incorrect options:

A: Since Statement 2 groups by ORDER_ID, it does not necessarily return just one row; it returns one row per ORDER_ID.

B: These statements do not yield the same output; Statement 1 returns a single maximum value, while Statement 2 returns the maximum value per ORDER_ID.

C: If either UNIT_PRICE or QUANTITY is NULL, the product for that row will be NULL, but the MAX function ignores NULL values in its calculation unless all rows are NULL, in which case it returns NULL.

For the *TABLES views in Oracle:

Option C: USER_TABLES displays all tables owned by the current user.

USER_TABLES is an Oracle data dictionary view that shows all tables owned by the user issuing the query.

Option F: All users can query DBA_TABLES successfully.

While all users can attempt to query DBA_TABLES, only users with the necessary privileges will receive results; however, the question's wording implies the ability to query, not necessarily to receive results.

Options A, B, D, and E are incorrect:

Option A and Option E are incorrect because ALL_TABLES and USER_TABLES show tables accessible to or owned by the current user, respectively, without requiring individual SELECT privileges.

Option B is incorrect because DBA_TABLES requires users to have the SELECT ANY TABLE privilege or equivalent, not SELECT privileges on each table.

Option D is incorrect because ALL_TABLES displays all tables that the current user has access to, not just those owned by them.