SQL: Must appear in the GROUP BY clause or be used in an aggregate function

Question

I have a Table that displays a teams salaries and I want to display their minimum, maximum and average salary for each team for each year.

My table looks like:

I run the following SQL:

SELECT MIN(salary), MAX(salary), AVG(salary), teamID, yearID FROM salaries; 

But get the following error:

ERROR: column "salaries.teamid" must appear in the GROUP BY clause or be used in an aggregate function

What does it mean?

Answer 1

Try this

SELECT MIN(salary), MAX(salary), AVG(salary), teamID, yearID FROM 
salaries group by teamID,yearID

Answer 2

SELECT MIN(salary), MAX(salary), AVG(salary), teamID, yearID 
FROM salaries
GROUP BY teamID, yearID;