Agnes Has Been Using XQuery to Design Queries Using Path

question 48

Multiple Choice

Agnes has been using XQuery to design queries using path expressions. Her next project will involve multiple source documents and require more complicated criteria. She has heard that a FLWOR structure could be effective for such cases, and comes to you for assistance in developing a FLWOR structure query.
-Agnes is confused by the rules about how many of each type of clause are required in a FLWOR structure. You tell her that in a FLWOR structure, there must be exactly only one _____ clause.

• A) where
• B) for
• C) let
• D) return

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Definitions:

Price Ceilings

Government-imposed limits on how high a price can be charged for a product or service, aimed at protecting consumers.

Ration Coupons

Documents or certificates that allow the holder to purchase a certain amount of a product, used especially during shortages to ensure fair distribution.

Government-mandated Increase

A requirement imposed by the government that results in a rise, often relating to wages, prices, or taxes.

Demand and Supply Curves

Graphs used in economics to illustrate the relationship between how much of a good or service is desired by buyers (demand) and how much is available from suppliers (supply) at various prices.