* 특정 필드 검색
select 필드명 from 테이블명 where 필드='값';
예) select post_no from post where post_no = '530-360';
* 중복 필드 제거(distinct)
select distinct(names) as d_names from picomax_addr;
*where문 - 조건
- 아닌것만 검사 (<>)
select * from picomax_addr where names <> '테스트';
- null 만 검사
select * from picomax_addr where names is null;
- 영역 검사 (between)
select * from post where post_no between '530-360' and '530-390';
- 영역내 검사 (in)
select * from picomax_addr where names names in('테스트','홍길동');
- 패턴매칭 검사(like)
select post_no from post where post_no like '530-3%';
select post_no from post where post_no like '530-3_0';
select post_no from post where post_no like '530-3__';
- 부정 검사(not)
select * from picomax_addr where names is not null;
- 조건연산자(and, or)
select * from picomax_addr where names='테스트' and telno='000-0000';
- 검색결과의 정렬(order by)
select * from picomax_addr order by telno ASC;
select * from picomax_addr order by telno DESC;
- 합계 (sum)
select sum(점수) from 학점;
select sum(점수) as 총점 from 학점;
- 평균 (avg)
select avg(점수) from 학점;
- 최소값 (min)
select min(점수) from 학점;
- 최대값(max)
select max(점수) from 학점;
* group by 문
select 과목, count(*) from 학점 group by 과목;