SAP C_HANADEV_18 Exam Questions

To complete the navigation definition from the customer entity set to the corresponding sales orders, you need to insert an association statement between the two entity sets. An association defines a relationship between two entity sets based on a referential constraint, which specifies the foreign key and the principal key properties that link the entity sets.An association also defines the cardinality and the role names of the entity sets involved in the relationship1. In this case, the association statement should look something like this:

association Customer_Orders with referential constraint principal customer key CustomerID dependent Orders key CustomerID multiplicity ''1'' to ''*'';

This statement defines an association named Customer_Orders that relates the customer entity set with the Orders entity set based on the CustomerID property. The principal role is assigned to the customer entity set, which means that each customer entity can have zero or more related Orders entities.The dependent role is assigned to the Orders entity set, which means that each Orders entity must have exactly one related customer entity2.

The other options are not correct because:

Aggregation: This is a feature of calculation views that allows you to define measures and attributes for analytical queries.It is not related to OData service definitions3.

Key specification: This is a clause that you use to define the key properties of an entity type in an OData service definition.It is not used to define navigation between entity sets1.

Join condition: This is a clause that you use to specify how to join two tables or views in a SQL statement.It is not used to define navigation between entity sets4.

To produce sales value for the month using sales order line items (sales price per item x quantity sold), you can use a calculated column of a calculation view that performs the multiplication of the two columns and applies a transparent filter and a non-equijoin to restrict the data to the desired month. A transparent filter is a filter condition that is applied to the data source of a view node and is propagated to the subsequent nodes. A non-equijoin is a join condition that uses operators other than equality, such as greater than, less than, or between. For example, you can use a transparent filter to filter the sales order line items by the month of the order date, and then use a non-equijoin to join the sales order line items with the sales price table by the order date and the valid from and valid to dates of the sales price.Reference:Transparent Filters,Non-Equijoins,Create Calculated Columns.

To specify the target currency for currency conversion in calculation views, you can use one of the following methods:

In a column: You can associate the measure with an attribute column that contains the target currency code. For example, if you have a table that stores the sales amount and the currency code for each transaction, you can use the currency code column as the target currency for the sales amount measure.

With an input parameter: You can create an input parameter that allows the user to select or enter the target currency code at runtime. For example, if you want to display the sales amount in different currencies based on the user's preference, you can use an input parameter as the target currency for the sales amount measure.

With a fixed value: You can associate the measure with a fixed currency code that is available in the currency table. For example, if you want to display the sales amount in a single currency, such as USD, you can use a fixed value as the target currency for the sales amount measure.Reference:Associate Measures with Currency,How to perform Currency Conversion in SAP HANA,Implementing Currency Conversion.

According to the SAP HANA Developer Guide, XSODATA supports the following HTTP commands to define the operations on the resources:

DGET: Retrieves a single entity or a collection of entities from the data source.

DPUT: Updates an existing entity in the data source.

POST: Creates a new entity in the data source.

DELETE: Deletes an existing entity from the data source.

The READ and INSERT commands are not valid HTTP commands for XSODATA. They are keywords that can be used in the service definition file (.xsodata) to specify the access mode for each entity set.Reference:SAP HANA Developer Guide, Chapter 6, Section 6.4.2, page 2111

You can use Commit and Rollback statements in SQL Script procedures to control the transactional behavior of your code. Commit and Rollback statements allow you to commit or undo the changes made by the SQL statements within the procedure. You can also use them in exception handlers to handle errors and ensure data consistency. You cannot use Commit and Rollback statements in scalar user-defined functions, table user-defined functions, or scripted calculation views, as they are not allowed to have any side effects on the database.Reference:COMMIT and ROLLBACK,SQLScript Procedures, [SQLScript Functions].