Question :
Define aggregate function in database.
Subject
Database Management System
Standard
Computer Science Engineering
Views
509
Asked By
Victoria
Deepak
Answer / Solution
Answer / Solution
In database management, an aggregate function or aggregation function is a function where the values of multiple rows are grouped together to form a single summary value.
For example, the SUM() function calculates the total of all values in a column, the COUNT() function counts the number of rows in a table, and the AVG() function calculates the average of all values in a column.
Aggregate functions are often used with the
GROUP BYclause to group rows together by a common value and then calculate an aggregate function on the grouped rows.
For example, the following query uses the GROUP BY clause to group rows together by the Country column and then calculates the SUM() of the Sales column for each country:
SQL
SELECT Country, SUM(Sales) AS TotalSales
FROM Sales
GROUP BY Country;
This query will return a table with two columns: Country and TotalSales. The Country column will contain the name of the country, and the TotalSales column will contain the total sales for that country.
Aggregate functions are a powerful tool for summarizing data in a database. They can be used to quickly and easily calculate totals, counts, and averages, and they can be used to group data together by common values.
Here are some of the most common aggregate functions:
COUNT(): Counts the number of rows in a table or the number of rows that match a certain criteria.SUM(): Calculates the sum of all values in a column.AVG(): Calculates the average of all values in a column.MIN(): Finds the minimum value in a column.MAX(): Finds the maximum value in a column.
Aggregate functions can be used in a variety of ways to summarize data and gain insights into your data. For example, you could use aggregate functions to:
- Calculate the total sales for a product over a period of time.
- Find the average customer age.
- Identify the most popular product.
- Find the number of customers who have purchased a product more than once.
Aggregate functions are a powerful tool that can be used to make your data more meaningful.
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