select count(*) from table; 갯수구하기
select avg(컬럼명) from table; 평균
select sum(컬럼명) from table; 더하기
*max, min
select max(kor) from table; 최대값
select MIN(kor) from table; 최소값
select count(*) from table; 갯수구하기
select avg(컬럼명) from table; 평균
select sum(컬럼명) from table; 더하기
*max, min
select max(kor) from table; 최대값
select MIN(kor) from table; 최소값