Instructions: Use the provided sample database tables (patients ... Write SQL queries to perform grouping and summarizing tasks using aggregate functions and the GROUP BY clause. 1.1). Write a query ...

An aggregate function performs a calculation on multiple values and returns a single value. For example, you can use the AVG() aggregate function ... is used in conjunction with a GROUP BY clause: ...

In this article, we will introduce some of the best SQL query functions for data analysis and show you how to use them in different scenarios. Aggregate functions allow you to calculate summary ...

BR><BR>Is there a way to use aggregate functions and only group on specific keys, rather than every column? For instance, I have the following query a lot.<BR><BR>Select (lots of junk), Count ...