Question at position 43 Window functions can be a part of a calculation within a SELECT statement.TrueFalse

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BlackTom AI · Accepted Answer

The question asks about the role of window functions in a SELECT statement and presents two options: True or False.
Option 1: 'True' — Window functions can indeed be a part of a calculation within a SELECT statement. In SQL, you can include window functions in the SELECT list and use their results in expressions and calculations, such as 5 * (salary * 1.05) OVER (PARTITION BY department), depending on the dialect. This option aligns with how window functions are designed to operate in many SQL implementations, where their results are computed over a specified window and can participate in subsequent expressions.
Option 2: 'False' — Saying that window functions cannot be part of a calculation within a SELECT statement is inaccurate. The typical limitation is that window functions cannot be used in a WHERE, GROUP BY, or HAVING clause in many databases, because those clauses are evaluated before the window function computations. However, within the SELECT list itself, and in some cases in ORDER BY (depending on the DB), their results can be used in calculations or expressions. Therefore this statement misrepresents their role within a SELECT.
In summary, the assertion that window functions can be part of a calculation within a SELECT statement is correct, while the assertion that they cannot is incorrect due to misunderstandings about where and how window function results are allowed to be used.

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