Which Statement About Table Joins in SQL Is True

question 16

Multiple Choice

Which statement about table joins in SQL is true?

• A) Self-joins usually do not include WHERE or ORDER BY clauses.
• B) You cannot perform a self-join on a table's primary key column.
• C) Joins must be performed between at least two different tables.
• D) SQL has no problem treating one table with two aliases as two tables.

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Definitions:

Expected Value

A statistical concept that calculates the average outcome when the future includes scenarios that may or may not happen.

Natural Logarithm

A mathematical function denoted as ln(x), representing the time needed to reach a certain level of growth at a constant growth rate of 100%.

Utility Function

A mathematical model that represents consumer preferences by assigning a level of utility, or satisfaction, to different bundles of goods or services.

Probability

An indicator of the probability of an event happening, represented by a value ranging from 0 to 1.