Diebold Nixdorf Senior Systems Engineer Interview Questions and Answers

Fan trap is a situation in which a query involving multiple tables results in a Cartesian product.

• Fan trap occurs when a table is connected to multiple tables in a one-to-many relationship.

• It can be solved by creating a bridge table or by using aggregate functions.

• For example, if a customer table is connected to an orders table and a products table, a fan trap can occur when trying to retrieve information about custome...read more

Dynamic break in report allows for automatic page breaks based on data.

• Define a break field in the report design

• Set the break field to trigger a page break when its value changes

• Use dynamic break to automatically adjust page breaks based on data

• Example: A report on sales by region can use dynamic break to create a new page for each region

Foreach function is used to iterate through an array of strings in a report.

• Foreach function is used to loop through each element in an array of strings.

• It can be used to display each element in a report.

• Example: foreach(string item in stringArray){ Console.WriteLine(item); }

Aggregate awareness is a feature in Business Objects that allows reports to be optimized for performance by using aggregate tables.

• Aggregate awareness is used when creating reports in Business Objects

• It allows the report to use aggregate tables instead of detailed tables for improved performance

• Syntax: AGGR_AWARE(, ,

  )

• Example: AGGR_AWARE(Product, Sum(Sales), Sales_Fact_Table)

The @prompt function syntax is used to display a prompt message to the user and receive input.

• The syntax is @prompt('message', 'default value')

• The message is the prompt message to be displayed to the user

• The default value is optional and will be displayed in the input field

• The function returns the value entered by the user

Reverse an array of strings

• Iterate through the array from both ends and swap the elements

• Continue swapping until the middle of the array is reached