COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It avoids repetition when creating multiple window functions
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It comes before the ORDER BY clause
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It can create an alias for shared PARTITION BY and ORDER BY clauses
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It comes before the WHERE clause
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Detailed explanation-1: -Explanation: Since SQL Server 2005 we have had support for some window functions, they are: ROW NUMBER, RANK, DENSE RANK and NTILE. 7. Which of the following is not a type of window function? Explanation: There is an aggregate window function available in SQL Server.
Detailed explanation-2: -They reduce the result set based on the aggregation. Window partitions can be defined to form groups of rows. They compute a value for each and every row in the window. They require the ‘over’ clause.
Detailed explanation-3: -Window functions are permitted only in the select list and ORDER BY clause. Query result rows are determined from the FROM clause, after WHERE, GROUP BY, and HAVING processing, and windowing execution occurs before ORDER BY, LIMIT, and SELECT DISTINCT .