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

i have table displays teams salaries , want display minimum, maximum , average salary each team each year.

my table looks like:

i run following sql:

select min(salary), max(salary), avg(salary), teamid, yearid salaries;  

but following error:

error: column "salaries.teamid" must appear in group clause or used in aggregate function

what mean?

select min(salary), max(salary), avg(salary), teamid, yearid  salaries group teamid, yearid;