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Which of the clause is not mandatory?

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+1 vote
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in SQL Server by (80.5k points)
Which of the clause is not mandatory?

(a) OVER clause

(b) ORDER BY clause

(c) PARTITION BY clause

(d) All of the mentioned

This question was addressed to me in a national level competition.

The question is from Ranking topic in portion Manipulating Data with Select of SQL Server

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Correct choice is (c) PARTITION BY clause

The explanation: PARTITION BY clause is not mandatory and if you don’t specify it all the records of the result-set will be considered as a part of single record group.

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