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Generally, the following aggregate functions are applied on groups as described below:

Table 12.4 Aggregate Functions in SQL
S.No. Function Description/Purpose
1. MAX() Returns the maximum/highest value among the values in the given column/expression.
2. MIN() Returns the minimum/lowest value among the values in the given column/expression.
3. SUM() Returns the sum of the values under the specified column/expression.
4. AVG() Returns the average of the values under the specified column/expression.
5. COUNT() Returns the total number of values/records under the specified column/expression.
Consider a table Employee (employee code, employee name, salary, job and city) with the following
structure:
Ecode Name Salary Job City
E1 Ritu Jain 5000 Manager Delhi
E2 Vikas Verma 4500 Executive Jaipur
E3 Rajat Chaudhary 6000 Clerk Kanpur
E4 Leena Arora 7200 Manager Bangalore
E5 Shikha Sharma 8000 Accountant Kanpur
• MAX()

MAX() function is used to find the highest value among the given set of values of any column
or expression based on the column. MAX() takes one argument which can be either a column
name or any valid expression involving a particular column from the table.

For example,
mysql> Select MAX(Salary) from EMPLOYEE;
Output:
+----------------+

| MAX(Salary)|
+----------------+
| 8000 |
+----------------+
This command, on execution, shall return the maximum value from the specified column
(Salary) of the table Employee, which is 8000.
• MIN()

MIN() function is used to find the lowest value among the given set of values of any column or
expression based on the column. MIN() takes one argument which can be either a column name
Computer Science with Python–XII 12.44 Output:
or any valid expression involving a particular column from the table.
For example,

mysql> Select MIN(Salary) from EMPLOYEE;

+----------------+

| MIN(Salary) |
+----------------+
| 4500 |
+----------------+