Pass the Oracle PL 1z0-071 Questions and answers with ExamsMirror

This SQL query checks for product IDs (prod_id) from the costs table where the promotion ID (promo_id) is associated with promotions whose costs are less than the maximum promotional cost of all promotions, grouped by the duration of each promotion (calculated as promo_end_date - promo_begin_date). The query is correctly written to fulfill these conditions.

The subquery SELECT MAX(promo_cost) FROM promotions GROUP BY (promo_end_date - promo_begin_date) computes the maximum cost of promotions grouped by their duration, returning the highest cost for each distinct promotion length.

The WHERE promo_cost < ALL (...) clause then filters out the promotions where the promo_cost is less than all of the maximum costs returned by the subquery, ensuring that only promo_ids associated with costs less than the highest cost for any promotion length are considered.

Since this logical structure correctly implements the given requirement, the statement executes successfully and yields the correct results.

Regarding Oracle join and ANSI join syntax:

B. The Oracle join syntax supports the creation of a Cartesian product of two tables. This is true. In Oracle, if you list tables in the FROM clause without a join condition, it creates a Cartesian product.

C. The SQL:1999 compliant ANSI join syntax supports natural joins. This is true. ANSI syntax supports natural joins, which join tables based on columns with the same names in the joined tables.

F. The SQL:1999 compliant ANSI join syntax supports the creation of a Cartesian product of two tables. This is true. The ANSI standard allows for Cartesian products when tables are listed in the FROM clause without a join condition.

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

A is incorrect because the Oracle join syntax supports all types of joins, including right outer joins.

D is incorrect because Oracle's proprietary join syntax does not use the term "natural join."

E is incorrect because there is no inherent performance difference between Oracle join syntax and ANSI join syntax; performance depends on how the query is written and how the database optimizer handles it.

G is incorrect for the same reason as E.

This question appears to be a duplicate of question no. 269, and the correct answers provided there apply here as well.

B. True. A DDL statement automatically commits any outstanding uncommitted transaction in the session. E. True. Exiting SQL*Plus without explicitly committing a transaction will cause the uncommitted transaction to be rolled back, not committed.

A, C, and D are incorrect for the same reasons provided in the explanation for question no. 269.

The NULLIF and COALESCE functions in Oracle SQL serve specific purposes:

Option A: Executes successfully. NULLIF returns NULL if the two arguments are equal; otherwise, it returns the first argument.

Option B: Also correct. COALESCE returns the first non-null value among its arguments.

Option C: This will not execute successfully because NULLIF requires both arguments to be of comparable data types. Comparing an integer to a character ('100' to 'A') is invalid.

Option D: Executes successfully. NULLIF returns NULL because it compares NULL to a number, which is valid (though always yields NULL).

Option E: Executes successfully. COALESCE accepts any data type as it returns the first non-null value, irrespective of type consistency among the arguments.

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"

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.

In Oracle Database 12c, when creating an external table using the CREATE TABLE ... ORGANIZATION EXTERNAL statement, there are certain clauses that are mandatory for the command to execute successfully.

Statement C, the LOCATION clause, is required. The LOCATION clause specifies one or more external data source locations, typically a file or a directory that the external table will read from. Without this, Oracle would not know where to find the external data for the table.

Statement E, the access driver TYPE clause, is also required. The access driver tells Oracle how to interpret the format of the data files. The most common access driver is ORACLE_LOADER, which allows the reading of data files in a format compatible with the SQL*Loader utility. Another option could be ORACLE_DATAPUMP, which reads data in a Data Pump format.

Statements A, B, and D are not strictly required for the command to execute successfully, although they are often used in practice:

A, the DEFAULT DIRECTORY clause, is not mandatory if you have specified the full path in the LOCATION clause, but it is a best practice to use it to avoid hard-coding directory paths in the LOCATION clause.

B, the REJECT LIMIT clause, is optional and specifies the maximum number of errors to allow during the loading of data. If not specified, the default is 0, meaning the load will fail upon the first error encountered.

D, the ACCESS PARAMETERS clause, is where one would specify parameters for the access driver, such as field delimiters and record formatting details. While it is common to include this clause to define the format of the external data, it is not absolutely required for the command to execute; defaults would be used if this clause is omitted.

For reference, you can find more details in the Oracle Database SQL Language Reference for version 12c, under the CREATE TABLE statement for external tables.

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.

Roles in Oracle Database are designed to simplify the management of privileges. The following statements about roles are true:

B: A single user can indeed be assigned multiple roles. This allows for easy management of user privileges as they can be grouped into roles, and these roles can be granted to users.

D: A single role can be assigned to multiple users. This is one of the primary purposes of roles, to provide an efficient way to grant the same set of privileges to different users.

G: Privileges are granted to a role using the GRANT statement. This allows the role to encapsulate the privileges which can then be granted to users.

The incorrect options are:

A: Roles cannot be assigned to other roles using the ALTER ROLE statement; they are granted to other roles using the GRANT statement.

C: Roles are not assigned to users using the ALTER USER statement; roles are granted to users using the GRANT statement.

E: Privileges are not assigned to a role using the ALTER ROLE statement; they are granted using the GRANT statement.

F: A role is not limited to being assigned to just one user; it can be assigned to multiple users.

References:

Oracle Documentation on Roles: Database Security Guide - Roles

Oracle Documentation on the GRANT statement: SQL Language Reference - GRANT

Regarding the provided SQL INTERSECT query:

D. 1 ROW: The INTERSECT operation will compare the two SELECT statements and return rows that are identical between them. Both queries are designed to return the same values ('1' for the ID, 'John' for the name, and NULL for the commission), hence one row that is identical between the two datasets will be returned.

Incorrect options:

A: Only one identical row exists between the two datasets.

B: There is an identical row; thus, it is not zero.

C: There is no error in the syntax or execution of the query.