SQL 차집합, 교집합, 합집합(Union, Union all, intersect, minus, exists)

--실습테이블 생성----테이블 생성--create table class_1(id varchar2(100),constraint number_pk primary key(id),name varchar2(100) not null,total_scoure varchar2(100));create table class_2(id varchar(100),constraint in_2 primary key(id),name varchar2(100) not null,total_scoure varchar2(100));--값 삽입--insert into class_1 values('1001A', '나상현', 500);insert into class_1 values('1002A', '유다빈', 480);insert into clas..

2024.09.17