COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It groups tables together.
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It groups rows that have the same values into summary rows and is often used with aggregate functions.
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It must be used when you use ORDER BY.
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It is always used when you use an aggregate function.
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Detailed explanation-1: -The GROUP BY statement groups rows that have the same values into summary rows, like “find the number of customers in each country". The GROUP BY statement is often used with aggregate functions ( COUNT(), MAX(), MIN(), SUM(), AVG() ) to group the result-set by one or more columns.
Detailed explanation-2: -GROUP BY is a SQL command commonly used to aggregate the data to get insights from it. There are three phases when you group data: Split: the dataset is split up into chunks of rows based on the values of the variables we have chosen for the aggregation.
Detailed explanation-3: -The Group By statement is used to group together any rows of a column with the same value stored in them, based on a function specified in the statement. Generally, these functions are one of the aggregate functions such as MAX() and SUM().
Detailed explanation-4: -Summary. The primary function of the GROUP BY clause is to divide the rows within a table into groups.
Detailed explanation-5: -1. Group by statement is used to group the rows that have the same value. Whereas Order by statement sort the result-set either in ascending or in descending order.