Oracle PL/SQL/Table Joins/Right Outer Joins

Group by and right join department id

   
SQL>
SQL> create table emp
  2  ( empno      NUMBER(4)    constraint E_PK primary key
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , sal        NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2)    default 10
 11  ) ;
Table created.
SQL> insert into emp values(1,"Tom","N",   "TRAINER", 13,date "1965-12-17",  800 , NULL,  20);
1 row created.
SQL> insert into emp values(2,"Jack","JAM", "Tester",6,date "1961-02-20",  1600, 300,   30);
1 row created.
SQL> insert into emp values(3,"Wil","TF" ,  "Tester",6,date "1962-02-22",  1250, 500,   30);
1 row created.
SQL> insert into emp values(4,"Jane","JM",  "Designer", 9,date "1967-04-02",  2975, NULL,  20);
1 row created.
SQL> insert into emp values(5,"Mary","P",  "Tester",6,date "1956-09-28",  1250, 1400,  30);
1 row created.
SQL> insert into emp values(6,"Black","R",   "Designer", 9,date "1963-11-01",  2850, NULL,  30);
1 row created.
SQL> insert into emp values(7,"Chris","AB",  "Designer", 9,date "1965-06-09",  2450, NULL,  10);
1 row created.
SQL> insert into emp values(8,"Smart","SCJ", "TRAINER", 4,date "1959-11-26",  3000, NULL,  20);
1 row created.
SQL> insert into emp values(9,"Peter","CC",   "Designer",NULL,date "1952-11-17",  5000, NULL,  10);
1 row created.
SQL> insert into emp values(10,"Take","JJ", "Tester",6,date "1968-09-28",  1500, 0,     30);
1 row created.
SQL> insert into emp values(11,"Ana","AA",  "TRAINER", 8,date "1966-12-30",  1100, NULL,  20);
1 row created.
SQL> insert into emp values(12,"Jane","R",   "Manager",   6,date "1969-12-03",  800 , NULL,  30);
1 row created.
SQL> insert into emp values(13,"Fake","MG",   "TRAINER", 4,date "1959-02-13",  3000, NULL,  20);
1 row created.
SQL> insert into emp values(14,"Mike","TJA","Manager",   7,date "1962-01-23",  1300, NULL,  10);
1 row created.
SQL>
SQL> create table departments
  2  ( deptno NUMBER(2)     constraint D_PK
  3                         primary key
  4  , dname  VARCHAR2(10)
  5  , location VARCHAR2(8)
  6  , mgr    NUMBER(4)
  7  ) ;
Table created.
SQL>
SQL> insert into departments values (10,"ACCOUNTING","NEW YORK",7);
1 row created.
SQL> insert into departments values (20,"TRAINING",  "DALLAS",  4);
1 row created.
SQL> insert into departments values (30,"SALES",     "CHICAGO", 6);
1 row created.
SQL> insert into departments values (40,"HR",        "BOSTON",  9);
1 row created.
SQL>
SQL> select deptno, count(*)
  2  from   emp e
  3         right outer join
  4         departments d
  5         using (deptno)
  6  group  by deptno;
    DEPTNO   COUNT(*)
---------- ----------
        10          3
        20          5
        30          6
        40          1
SQL>
SQL> drop table emp;
Table dropped.
SQL> drop table departments;
Table dropped.
SQL>

Right join with where in clause

   
SQL>
SQL>
SQL> CREATE TABLE emp
  2  (
  3     cid                NUMBER,
  4     lname         VARCHAR2(40) ,
  5     city              VARCHAR2(30) ,
  6     customer_state             VARCHAR2(40),
  7     country_id                 CHAR(2) ,
  8     customer_credit            NUMBER
  9  );
Table created.
SQL>
SQL> CREATE TABLE sales(
  2    product_id                NUMBER(6),
  3    cid               NUMBER,
  4    time_id                   DATE,
  5    channel_id                CHAR(1),
  6    promo_id                  NUMBER(6),
  7    sold             NUMBER(3),
  8    amount                    NUMBER(10,2),
  9    cost                      NUMBER(10,2)
 10  );
Table created.
SQL>
SQL>
SQL>
SQL> select c.cid, c.lname, s.product_id, s.sold
  2  from sales s right join emp c
  3     on c.cid = s.cid
  4  where c.cid in (1,80);
no rows selected
SQL>
SQL> drop table sales;
Table dropped.
SQL> drop table emp;
Table dropped.
SQL>
SQL>

right outer join between department table and employee table

   
SQL>
SQL> CREATE TABLE departments
  2  (department_id           number(10)            not null,
  3   department_name      varchar2(50)      not null,
  4   CONSTRAINT departments_pk PRIMARY KEY (department_id)
  5  );
Table created.
SQL>
SQL>
SQL>
SQL> insert into departments ( department_id, department_name )
  2                    values( 1,             "Data Group" );
1 row created.
SQL>
SQL> insert into departments ( department_id, department_name )
  2                    values( 2,             "Purchasing" );
1 row created.
SQL>
SQL> insert into departments ( department_id, department_name )
  2                    values( 3,             "Call Center" );
1 row created.
SQL>
SQL> insert into departments ( department_id, department_name )
  2                    values( 4,             "Communication" );
1 row created.
SQL>
SQL>
SQL>
SQL> CREATE TABLE employees
  2  ( employee_id          number(10)      not null,
  3    last_name            varchar2(50)      not null,
  4    email                varchar2(30),
  5    hire_date            date,
  6    job_id               varchar2(30),
  7    department_id        number(10),
  8    salary               number(6),
  9    manager_id           number(6),
 10    CONSTRAINT           employees_pk PRIMARY KEY (employee_id),
 11    CONSTRAINT           fk_departments FOREIGN KEY (department_id) REFERENCES departments(department_id)
 12  );
Table created.
SQL>
SQL>
SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary,department_id ,manager_id)
  2                values ( 1001, "Lawson", "lawson@g.ru", "01-JAN-2002","MGR", 30000,1 ,1004);
1 row created.
SQL>
SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id ,manager_id)
  2                values ( 1002, "Wells", "wells@g.ru", "01-JAN-2002", "DBA", 20000,2, 1005 );
1 row created.
SQL>
SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id ,manager_id)
  2                 values( 1003, "Bliss", "bliss@g.ru", "01-JAN-2002", "PROG", 24000,3 ,1004);
1 row created.
SQL>
SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id, manager_id)
  2                 values( 1004,  "Kyte", "tkyte@a.ru", SYSDATE-3650, "MGR",25000 ,4, 1005);
1 row created.
SQL>
SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id, manager_id)
  2                 values( 1005, "Viper", "sdillon@a .ru", SYSDATE, "PROG", 20000, 1, 1006);
1 row created.
SQL>
SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id,manager_id)
  2                 values( 1006, "Beck", "clbeck@g.ru", SYSDATE, "PROG", 20000, 2, null);
1 row created.
SQL>
SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id, manager_id)
  2                 values( 1007, "Java", "java01@g.ru", SYSDATE, "PROG", 20000, 3, 1006);
1 row created.
SQL>
SQL> insert into employees( employee_id, last_name, email, hire_date, job_id, salary, department_id, manager_id)
  2                 values( 1008, "Oracle", "wvelasq@g.ru", SYSDATE, "DBA", 20000, 4, 1006);
1 row created.
SQL>
SQL> select * from employees;
EMPLOYEE_ID LAST_NAME                                          EMAIL                          HIRE_DATE JOB_ID                         DEPARTMENT_ID     SALARY MANAGER_ID
----------- -------------------------------------------------- ------------------------------ --------- ------------------------------ ------------- ---------- ----------
       1001 Lawson                                             lawson@g.ru                   01-JAN-02 MGR                                        1      30000       1004
       1002 Wells                                              wells@g.ru                    01-JAN-02 DBA                                        2      20000       1005
       1003 Bliss                                              bliss@g.ru                    01-JAN-02 PROG                                       3      24000       1004
       1004 Kyte                                               tkyte@a.ru                    13-JUN-98 MGR                                        4      25000       1005
       1005 Viper                                              sdillon@a .ru                 10-JUN-08 PROG                                       1      20000       1006
       1006 Beck                                               clbeck@g.ru                   10-JUN-08 PROG                                       2      20000
       1007 Java                                               java01@g.ru                   10-JUN-08 PROG                                       3      20000       1006
EMPLOYEE_ID LAST_NAME                                          EMAIL                          HIRE_DATE JOB_ID                         DEPARTMENT_ID     SALARY MANAGER_ID
----------- -------------------------------------------------- ------------------------------ --------- ------------------------------ ------------- ---------- ----------
       1008 Oracle                                             wvelasq@g.ru                  10-JUN-08 DBA                                        4      20000       1006
8 rows selected.
SQL>
SQL> select * from departments;
DEPARTMENT_ID DEPARTMENT_NA
------------- -------------
            1 Data Group
            2 Purchasing
            3 Call Center
            4 Communication
4 rows selected.
SQL>
SQL>
SQL> select e.employee_id, e.last_name, d.department_name
  2        from employees e right outer join departments d
  3          on e.department_id = d.department_id
  4       where d.department_name = "Purchasing"
  5       order by d.department_name, e.last_name
  6      /
EMPLOYEE_ID LAST_NAME                                          DEPARTMENT_NA
----------- -------------------------------------------------- -------------
       1006 Beck                                               Purchasing
       1002 Wells                                              Purchasing
SQL>
SQL>
SQL> drop table employees cascade constraints;
Table dropped.
SQL> drop table departments cascade constraints;
Table dropped.

Right Outer Join, room table and class table

   
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>
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>
SQL>
SQL>
SQL> SELECT Room.RoomID, Class.Time
  2  FROM Room
  3     RIGHT OUTER JOIN Class
  4     ON Room.RoomID = Class.RoomID
  5  ORDER BY Room.RoomID;
    ROOMID TIME
---------- --------------------------------------------------
         2 Tue 10:00-12:00, Thu 14:00-15:00
         3 Mon 14:00-16:00
           Mon 09:00-11:00
           Mon 11:00-12:00, Thu 09:00-11:00
4 rows selected.
SQL>
SQL> drop table Room;
Table dropped.
SQL> drop table Class;
Table dropped.

Right Outer Join(room vs class)

   
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 Room.RoomID, Class.Time
  2  FROM Class
  3     RIGHT OUTER JOIN Room
  4     ON Class.RoomID = Room.RoomID
  5  ORDER BY Room.RoomID;
    ROOMID TIME
---------- --------------------------------------------------
         1
         2 Tue 10:00-12:00, Thu 14:00-15:00
         3 Mon 14:00-16:00
         4
         5 Mon 11:00-12:00, Thu 09:00-11:00
5 rows selected.
SQL>
SQL> drop table Room;
Table dropped.
SQL> drop table Class;
Table dropped.

Right outer joins:return all the rows from the table on the right instead of the table on the left

  
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
  2                    ENAME VARCHAR2(10),
  3                    JOB VARCHAR2(9),
  4                    MGR NUMBER(4),
  5                    HIREDATE DATE,
  6                    SAL NUMBER(7, 2),
  7                    COMM NUMBER(7, 2),
  8                    DEPTNO NUMBER(2));
Table created.
SQL>
SQL> INSERT INTO EMP VALUES (7369, "SMITH", "CLERK",    7902, TO_DATE("17-DEC-1980", "DD-MON-YYYY"), 800, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7499, "ALLEN", "SALESMAN", 7698, TO_DATE("20-FEB-1981", "DD-MON-YYYY"), 1600, 300, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7521, "WARD",  "SALESMAN", 7698, TO_DATE("22-FEB-1981", "DD-MON-YYYY"), 1250, 500, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7566, "JONES", "MANAGER",  7839, TO_DATE("2-APR-1981",  "DD-MON-YYYY"), 2975, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7654, "MARTIN", "SALESMAN", 7698,TO_DATE("28-SEP-1981", "DD-MON-YYYY"), 1250, 1400, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7698, "BLAKE", "MANAGER", 7839,TO_DATE("1-MAY-1981", "DD-MON-YYYY"), 2850, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7782, "CLARK", "MANAGER", 7839,TO_DATE("9-JUN-1981", "DD-MON-YYYY"), 2450, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7788, "SCOTT", "ANALYST", 7566,TO_DATE("09-DEC-1982", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7839, "KING", "PRESIDENT", NULL,TO_DATE("17-NOV-1981", "DD-MON-YYYY"), 5000, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7844, "TURNER", "SALESMAN", 7698,TO_DATE("8-SEP-1981", "DD-MON-YYYY"), 1500, 0, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7876, "ADAMS", "CLERK", 7788,TO_DATE("12-JAN-1983", "DD-MON-YYYY"), 1100, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7900, "JAMES", "CLERK", 7698,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 950, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7902, "FORD", "ANALYST", 7566,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7934, "MILLER", "CLERK", 7782,TO_DATE("23-JAN-1982", "DD-MON-YYYY"), 1300, NULL, 10);
1 row created.
SQL>
SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) );
Table created.
SQL>
SQL> INSERT INTO DEPT VALUES (10, "ACCOUNTING", "NEW YORK");
1 row created.
SQL> INSERT INTO DEPT VALUES (20, "RESEARCH", "DALLAS");
1 row created.
SQL> INSERT INTO DEPT VALUES (30, "SALES", "CHICAGO");
1 row created.
SQL> INSERT INTO DEPT VALUES (40, "OPERATIONS", "BOSTON");
1 row created.
SQL>
SQL>
SQL> select * from emp;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 09-DEC-82       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 12-JAN-83       1100                    20
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
14 rows selected.
SQL>
SQL> select * from dept;
    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON
SQL>
SQL>
SQL>
SQL> -- right outer joins.
SQL> -- return all the rows from the table on the right of the join condition instead of the 
table on the left.
SQL>
SQL> select e.empno, e.ename, d.dname
  2        from emp e right outer join dept d
  3          on e.deptno = d.deptno
  4       where d.loc = "CHICAGO"
  5       order by d.dname, e.ename;
     EMPNO ENAME      DNAME
---------- ---------- --------------
      7499 ALLEN      SALES
      7698 BLAKE      SALES
      7900 JAMES      SALES
      7654 MARTIN     SALES
      7844 TURNER     SALES
      7521 WARD       SALES
6 rows selected.
SQL>
SQL>
SQL> drop table dept;
Table dropped.
SQL> drop table emp;
Table dropped.
SQL>
SQL>
SQL>
SQL>
SQL>