An aggregate function is a function where the values of multiple rows are grouped together to form a single value of more significant meaning or measurements such as a set, a bag or a list.
%%sql
select max(empsal) from emp_<<your lab username>>;
select avg(empsal) from emp_<<your lab username>>;
select sum(empsal) from emp_<<your lab username>>;
select count(empsal) from emp_<<your lab username>>;
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