join

join (ansi).sql

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+USE Study
+GO
+
+-- INNER JOIN
+SELECT ENAME, DNAME
+FROM EMPLOYEE
+	INNER JOIN DEPARTMENT ON EMPLOYEE.DNO = DEPARTMENT.DNO
+
+-- OUTER JOIN
+SELECT E.ENAME AS EMPLOYEE, M.ENAME AS MANAGER
+FROM EMPLOYEE AS E
+	LEFT OUTER JOIN EMPLOYEE AS M ON E.MANAGER = M.ENO

join (cartesian).sql

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+USE Study
+GO
+
+SELECT * FROM EMPLOYEE
+SELECT * FROM DEPARTMENT
+
+-- Cartesian product: ¸ðµç Æ©ÇÃ½Ö »ý¼º (same as Cross join)
+SELECT * FROM EMPLOYEE, DEPARTMENT
+
+select * from EMPLOYEE
+select * from SALGRADE
+
+-- Theta join
+SELECT ENAME, GRADE
+FROM EMPLOYEE, SALGRADE
+WHERE LOWSAL <= SALARY AND SALARY <= HIGHSAL
+
+SELECT ENAME, GRADE
+FROM EMPLOYEE, SALGRADE
+WHERE SALARY BETWEEN LOWSAL AND HIGHSAL
+
+-- Self join
+SELECT E.ENAME AS ENAME, M.ENAME AS MANAGER
+FROM EMPLOYEE AS E, EMPLOYEE AS M
+WHERE E.MANAGER = M.ENO
+
+-- Mulitple join
+SELECT ENAME, GRADE, DNAME
+FROM EMPLOYEE, SALGRADE, DEPARTMENT
+WHERE SALARY BETWEEN LOWSAL AND HIGHSAL
+	AND EMPLOYEE.DNO = DEPARTMENT.DNO

simple join.sql

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+USE Study
+GO
+
+SELECT * FROM EMPLOYEE
+SELECT * FROM DEPARTMENT
+
+SELECT *
+FROM EMPLOYEE, DEPARTMENT
+WHERE ENO = 103 AND EMPLOYEE.DNO = DEPARTMENT.DNO
+
+SELECT *
+FROM EMPLOYEE AS E, DEPARTMENT AS D
+WHERE ENO = 103 AND E.DNO = D.DNO