제목 : 13.2. 조인(Inner, Left, Right, Full) 연습용 쿼리
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글번호:
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63
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작성자:
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레드플러스
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작성일:
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2012/07/06 오전 8:46:00
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조회수:
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8034
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파일:
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(다운로드 권한이 없습니다.)
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--[!] 조인 연습을 위한 테이블 생성
Create Table People
(
Num Int Primary Key,
Name VarChar(10)
)
Go
Create Table Computer
(
Num Int Primary Key,
Model VarChar(10)
)
Go
--[2] 데이터 입력
Insert Into People(Num, Name) Values(1, '홍길동');
Insert Into People(Num, Name) Values(2, '백두산');
Insert Into People(Num, Name) Values(3, '임꺽정');
Insert Into People(Num, Name) Values(4, '한라산');
Insert Into People(Num, Name) Values(5, '지리산');
Insert Into Computer(Num, Model) Values(3, 'M17x');
Insert Into Computer(Num, Model) Values(4, 'M6600');
--[3] 조회
--[3][1] Inner Join : 두 테이블의 교집합
--[3][1][1] ANSI SQL
Select People.Num, People.Name, Computer.Model
From People Join Computer On People.Num = Computer.Num;
--[3][1][2] T-SQL
Select People.Num, People.Name, Computer.Model
From People, Computer
Where People.Num = Computer.Num;
--[3][2] Left Outer Join / Left Join : 왼쪽 테이블의 모든 데이터 포함
--[3][2][1] ANSI SQL
Select People.Num, People.Name, Computer.Model
From People Left Outer Join Computer On People.Num = Computer.Num;
--[3][3] Right Outer Join / Right Join : 오른쪽 테이블의 모든 데이터 포함
--[3][3][1] ANSI SQL
Select People.Num, People.Name, Computer.Model
From People Right Outer Join Computer On People.Num = Computer.Num;
--[3][4] Full Outer Join : 전체집합
--[3][4][1] ANSI SQL
Select People.Num, People.Name, Computer.Model
From People Full Outer Join Computer On People.Num = Computer.Num;