What are the different aggregate functions in SQL?
The SQL GROUP BY StatementThe Show
The GROUP BY Syntax SELECT column_name(s) Demo DatabaseBelow is a selection from the "Customers" table in the Northwind sample database:
SQL GROUP BY ExamplesThe following SQL statement lists the number of customers in each country: Example SELECT COUNT(CustomerID), Country Try it Yourself » The following SQL statement lists the number of customers in each country, sorted high to low: Example SELECT COUNT(CustomerID), Country Try it Yourself » Demo DatabaseBelow is a selection from the "Orders" table in the Northwind sample database:
And a selection from the "Shippers" table:
GROUP BY With JOIN ExampleThe following SQL statement lists the number of orders sent by each shipper: Example SELECT Shippers.ShipperName, COUNT(Orders.OrderID) AS NumberOfOrders FROM Orders Try it Yourself » Improve Article Save Article Improve Article Save Article In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria to form a single value of more significant meaning. Various Aggregate Functions 1) Count() 2) Sum() 3) Avg() 4) Min() 5) Max() Now let us understand each Aggregate function with a example: Id Name Salary ----------------------- 1 A 80 2 B 40 3 C 60 4 D 70 5 E 60 6 F Null Count(): Count(*): Returns total number of records .i.e 6. Sum(): sum(salary):
Sum all Non Null values of Column salary i.e., 310 Avg(): Avg(salary) = Sum(salary) / count(salary) = 310/5 Min(): Min(salary):Minimum value in the salary column except NULL i.e.,
40. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above What are the 5 aggregate functions in SQL?Transact-SQL provides the following aggregate functions:. APPROX_COUNT_DISTINCT.. CHECKSUM_AGG.. COUNT.. COUNT_BIG.. GROUPING.. GROUPING_ID.. What is an aggregation function and what are different types?SQL aggregation function is used to perform the calculations on multiple rows of a single column of a table. It returns a single value. It is also used to summarize the data.
What is a SQL aggregate function example?An SQL aggregate function calculates on a set of values and returns a single value. For example, the average function ( AVG ) takes a list of values and returns the average. Because an aggregate function operates on a set of values, it is often used with the GROUP BY clause of the SELECT statement.
What are aggregate functions and list down 5 examples?AVG Function. This function returns the average value of the numeric column that is supplied as a parameter. ... . COUNT Function. The count function returns the number of rows in the result. ... . MAX Function. ... . SUM Function. ... . STDDEV Function. ... . VARIANCE Function.. |