Pass 1z0-071 Exam Guide

To calculate the total annual compensation, you need to sum the annual salary with the annual commission. The annual commission is the monthly commission percentage times the monthly salary times 12 (months). The NVL function is used to replace NULL with 0 for commission percentage when calculating the commission.

A: This statement is incorrect because it does not handle NULL values for 'monthly_commission_pct', which will result in NULL for the entire expression if 'monthly_commission_pct' is NULL.

B: This statement is syntactically incorrect because it lacks commas and proper parentheses to separate the column name 'last_ name' from the calculation.

C: This is the correct statement as it uses NVL to replace NULL with 0 and calculates the total annual compensation correctly.

D: This statement is incorrect because, like in option A, it does not handle NULL values in 'monthly_commission_pct', resulting in NULL if 'monthly_commission_pct' is NULL.

B: True. The Oracle Database MERGE statement can use a subquery that involves views to generate the source data for the merge operation. This allows for greater flexibility in specifying the data to be merged.

C: True. MERGE can conditionally combine rows from one or more source tables (or views, or the results of a subquery) to insert or update rows in a single target table based on whether or not a match exists.

D: True. MERGE can indeed use subqueries to produce source rows. The source data for a merge operation can be a table, view, or the result of a subquery.

The MERGE statement is a powerful SQL operation in Oracle that allows for conditional INSERT or UPDATE operations in one statement, often referred to as an "upsert" operation. It can handle complex scenarios where the decision to insert or update is based on whether the data matches between the target and source datasets.

References:Oracle SQL documentation on the MERGE statement provides information on how it can use different data sources, including subqueries and views, and perform conditional operations on the target table.

A. A customer can exist in many countries. This is true as customers can have multiple addresses or operations in different countries, and a database design can reflect this by allowing multiple country entries for a single customer1.

C. The statement will fail because subquery may not be I contained in a values clause. In Oracle Database 12c, a subquery cannot be used within the VALUES clause of an INSERT statement. The correct approach would be to use the subquery in conjunction with the INSERT INTO … SELECT syntax if multiple rows are derived from a subquery2.

F. A product can have a different unit price at different times. It is common for products to have different unit prices at different times due to various factors such as promotions, discounts, or changes in cost price. This can be represented in a database by having a price history table or a similar mechanism to track the changes in price over time1.

Note: The other options are incorrect because:

B. The statement about the SALES table failing if a row already exists for product 23 is not necessarily true. Oracle allows for multiple rows with the same product ID if the table is designed to handle such cases, like having a composite primary key or no constraints preventing duplicates.

D. Without specific information about the SALES table’s design, we cannot verify the number of foreign keys it has.

E. The statement about the successful execution and insertion of a new row into the SALES table is too vague without the context of the actual SQL statement being referred to.

In Oracle Database, object privileges are rights to perform a particular action on a specific object in the database. Here's why the other options are incorrect:

A. UPDATE can be granted on tables, views, and materialized views, but not sequences. B. DELETE cannot be granted on sequences because sequences do not store data that can be deleted. D. INSERT cannot be granted on sequences; sequences are used to generate numbers, not to be inserted into directly. C. REFERENCES allows the grantee to create a foreign key that references the table or the columns of the table. It is applicable only to tables and views. E. SELECT can indeed only be granted on tables and views (including materialized views). F. ALTER is an object privilege that can be granted on tables and sequences but not views.

For more details, one may refer to the Oracle Database SQL Language Reference documentation, which specifies the types of object privileges and the objects they apply to.