What does the expression SUBSTR(FIRST NAME, 1,3) return?

You are asked to perform either the initial load or delta load based on the value of a variable that is set at job execution How do you design this requirement in SAP Data services.

The Marketing department would like to send special offers to customers who have placed a specified number of orders. This can be done by creating a custom function that must be called when a customer order is placed.
You want to create a custom function to accept the input parameters of the Customer ID, and the number of orders required to receive a special order, check the Orders table, and then create an initial list of eligible customers.
How to In the Local Object Library, create a new customer function called CF_MarketingOffer.

What do you call for that particular link of Clicking to open a dialog box for changing a variety of options depending on the selected application?

What are task's of data Services uses the SAP RFC Server Interface?