Inner and Outer Joins : Inner Joins « Table Joins « Oracle PL / SQL





Inner and Outer Joins

  
SQL>
SQL>
SQL> CREATE TABLE Room (
  2     RoomID   INT NOT NULL PRIMARY KEY,
  3     Comments VARCHAR(50),
  4     Capacity INT);

Table created.

SQL> INSERT INTO Room (RoomID,Comments,Capacity) VALUES (1,'Main hall',500);

1 row created.

SQL> INSERT INTO Room (RoomID,Comments,Capacity) VALUES (2,'Science Department',200);

1 row created.

SQL> INSERT INTO Room (RoomID,Comments,Capacity) VALUES (3,'Science Room 1',100);

1 row created.

SQL> INSERT INTO Room (RoomID,Comments,Capacity) VALUES (4,'Languages Block',300);

1 row created.

SQL> INSERT INTO Room (RoomID,Comments,Capacity) VALUES (5,'Languages Room 1',75);

1 row created.

SQL>
SQL>
SQL>
SQL> CREATE TABLE Class (
  2     ClassID     INT NOT NULL PRIMARY KEY,
  3     CourseID    INT NOT NULL,
  4     InstructorID INT NOT NULL,
  5     RoomID      INT NOT NULL,
  6     Time        VARCHAR(50));

Table created.

SQL> INSERT INTO Class (ClassID,CourseID,InstructorID,RoomID,Time) VALUES (1,1,1,6,'Mon 09:00-11:00');

1 row created.

SQL> INSERT INTO Class (ClassID,CourseID,InstructorID,RoomID,Time) VALUES (2,2,1,5,'Mon 11:00-12:00, Thu 09:00-11:00');

1 row created.

SQL> INSERT INTO Class (ClassID,CourseID,InstructorID,RoomID,Time) VALUES (3,3,2,3,'Mon 14:00-16:00');

1 row created.

SQL> INSERT INTO Class (ClassID,CourseID,InstructorID,RoomID,Time) VALUES (4,4,3,2,'Tue 10:00-12:00, Thu 14:00-15:00');

1 row created.

SQL> INSERT INTO Class (ClassID,CourseID,InstructorID,RoomID,Time) VALUES (5,5,2,9,'Tue 14:00-16:00');

1 row created.

SQL>
SQL>
SQL>
SQL> SELECT Class.ClassID,
  2         Class.CourseID,
  3         Class.Time,
  4         Room.Comments AS RoomName
  5  FROM Class INNER JOIN Room
  6  ON Class.RoomID = Room.RoomID
  7  ORDER BY ClassID;

   CLASSID   COURSEID TIME
---------- ---------- --------------------------------------------------
ROOMNAME
--------------------------------------------------
         2          2 Mon 11:00-12:00, Thu 09:00-11:00
Languages Room 1

         3          3 Mon 14:00-16:00
Science Room 1

         4          4 Tue 10:00-12:00, Thu 14:00-15:00
Science Department


3 rows selected.

SQL>
SQL>
SQL> drop table Room;

Table dropped.

SQL> drop table Class;

Table dropped.

SQL>

   
    
  










Related examples in the same category

1.Inner joins use join conditions in the FROM clause just like natural joins
2.Three inner joins query
3.Inner join primary key and foreign key
4.Inner join with null foreign key
5.Reference inner query column in outter select statement
6.An inner join to
7.Using Inner Joins