When EXISTS or NOT EXISTS Is Used in a Subquery

question 23

True/False

When EXISTS or NOT EXISTS is used in a subquery, the select list of the subquery will usually just select all columns as a placeholder because it doesn't matter which columns are returned.

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Definitions:

Total Utility

The complete fulfillment experienced from the consumption of a specific amount of products or services.

Marginal Utility

The increased happiness or value a buyer experiences by consuming an extra unit of a good or service.

Diminishing Marginal Utility

The principle that as an individual consumes more of a good, the utility (satisfaction or benefit) gained from each additional unit decreases.

Total Utility

The overall satisfaction or value a consumer receives from consuming a particular quantity of a good or service.