What is aggregate function in SQL with example?

Question

SQL aggregation is the task of collecting a set of values to return a single value. It is done with the help of aggregate functions, such as SUM, COUNT, and AVG. For example, in a database of products, you might want to calculate the average price of the whole inventory.

What are aggregate functions in SQL give examples?

The following are the commonly used SQL aggregate functions:AVG() – returns the average of a set.COUNT() – returns the number of items in a set.MAX() – returns the maximum value in a set.MIN() – returns the minimum value in a set.SUM() – returns the sum of all or distinct values in a set.

What's an aggregate function in SQL?

An aggregate function performs a calculation on a set of values, and returns a single value. Except for COUNT(*) , aggregate functions ignore null values. Aggregate functions are often used with the GROUP BY clause of the SELECT statement. All aggregate functions are deterministic.

What are the aggregate function explain with suitable example?

Example: Write a query to return number of rows where salary > 20000. COUNT(*): Counts all the number of rows of the table including null. COUNT( COLUMN_NAME): count number of non-null values in column. COUNT( DISTINCT COLUMN_NAME): count number of distinct values in a column.

Which is an aggregate function?

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. Count(): Count(*): Returns total number of records .

Expert · Answer