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In database management systems, an aggregate function is a function that performs calculations on a group of values and returns a single value. It is used to summarize the data. It performs calculations on multiple rows of a single column of a table to form a single value of more significant meaning. These Aggregate functions are inbuilt SQL functions. They are often used with the GROUP BY clause to calculate an aggregate value for each group. Some of MySQL Aggregate functions are:
The AGGREGATE Functions ignore all NULL Values. AVGThe SQL AVG function calculates the average value of a column of numeric type. It returns the average of all non-NULL values. Syntax
For example:
COUNTThe COUNT function is used to count the number of rows in a database table. It can work on both numeric and non-numeric data types. The SQL COUNT function returns the number of rows in a table satisfying the criteria specified in the WHERE clause. It sets on the number of rows or non-NULL column values. COUNT function uses the COUNT(*) that returns the count of all the rows in a specified table. COUNT(*) considers duplicate and Null while Count(column_name) removes Null values records from counting. Syntax
For example:
MAXThe aggregate function MAX() is used to find the maximum value or highest value of a certain column or expression or a set of values. It is applicable to all the data types. It excludes NULL values and return distinct value as a result. Syntax
For example:
MINThe aggregate function MIN() is used to find the minimum value or lowest value of a certain column or expression or a set of values. It is applicable to all the data types. It excludes NULL values and return distinct value as a result. Syntax
For example
SUMThe aggregate function SUM() is used to calculate the sum of all the values of the select column. It returns the sum of values in a set. SUM function ignores the NULL values. If no matching records are found, it returns NULL. It is applicable to numeric values. Syntax
For example:
That's all about aggregate functions. Hope you learned something new today. Do share this blog with your friends to spread the knowledge. Visit our YouTube channel for more content. You can read more blogs from here. Keep Learning :) Team AfterAcademy! How are aggregate functions different from other types of functions quizlet?Aggregate functions perform a calculation on a set of values and return a single value. Except for COUNT, aggregate functions ignore null values. Aggregate functions are frequently used with the GROUP BY clause of the SELECT statement.
How are aggregate functions different from other SQL functions?Aggregate functions with GROUP BY differ from window functions in that they: Use GROUP BY() to define a set of rows for aggregation. Group rows based on column values. Collapse rows based on the defined groups.
What is an aggregation function and what are different types?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. Common aggregate functions include: Average (i.e., arithmetic mean) Count.
What is the difference between an aggregate function and a scalar function?A scalar function produces an output for each row of input, for example, taking the ABS of a column or expression. An aggregate function accepts values from multiple rows and produces an output, for example, taking the maximum of a column or expression.
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