Answer:
The count and sum aggregate functions are both used to perform mathematical calculations on data in a database or table. However, they perform different calculations and are used for different purposes.
The count function returns the number of rows in a table that match a specific condition. It can be used to count the number of records, the number of non-null values, or the number of unique values in a specific column. For example, you can use the count function to find the number of employees in a department or the number of customers who made a purchase in a specific month.
On the other hand, the sum function returns the sum of the values in a specific column. It is used to add up the values in a column, such as the total sales, the total salary of employees, or the total quantity of products sold.
In summary, the count function is used to count the number of records in a table, while the sum function is used to add up the values in a specific column.