Create view by join three tables : Create View « View « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial
1.Introduction
2.Query Select
3.Set
4.Insert Update Delete
5.Sequences
6.Table
7.Table Joins
8.View
9.Index
10.SQL Data Types
11.Character String Functions
12.Aggregate Functions
13.Date Timestamp Functions
14.Numerical Math Functions
15.Conversion Functions
16.Analytical Functions
17.Miscellaneous Functions
18.Regular Expressions Functions
19.Statistical Functions
20.Linear Regression Functions
21.PL SQL Data Types
22.PL SQL Statements
23.PL SQL Operators
24.PL SQL Programming
25.Cursor
26.Collections
27.Function Procedure Packages
28.Trigger
29.SQL PLUS Session Environment
30.System Tables Data Dictionary
31.System Packages
32.Object Oriented
33.XML
34.Large Objects
35.Transaction
36.User Privilege
Oracle PL/SQL Tutorial » View » Create View 
8.1.13.Create view by join three tables
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);

row created.

SQL> insert into emp values(2,'Jack','JAM', 'Tester',6,date '1961-02-20',  1600300,   30);

row created.

SQL> insert into emp values(3,'Wil','TF' ,  'Tester',6,date '1962-02-22',  1250500,   30);

row created.

SQL> insert into emp values(4,'Jane','JM',  'Designer', 9,date '1967-04-02',  2975, NULL,  20);

row created.

SQL> insert into emp values(5,'Mary','P',  'Tester',6,date '1956-09-28',  12501400,  30);

row created.

SQL> insert into emp values(6,'Black','R',   'Designer', 9,date '1963-11-01',  2850, NULL,  30);

row created.

SQL> insert into emp values(7,'Chris','AB',  'Designer', 9,date '1965-06-09',  2450, NULL,  10);

row created.

SQL> insert into emp values(8,'Smart','SCJ', 'TRAINER', 4,date '1959-11-26',  3000, NULL,  20);

row created.

SQL> insert into emp values(9,'Peter','CC',   'Designer',NULL,date '1952-11-17',  5000, NULL,  10);

row created.

SQL> insert into emp values(10,'Take','JJ', 'Tester',6,date '1968-09-28',  15000,     30);

row created.

SQL> insert into emp values(11,'Ana','AA',  'TRAINER', 8,date '1966-12-30',  1100, NULL,  20);

row created.

SQL> insert into emp values(12,'Jane','R',   'Manager',   6,date '1969-12-03',  800 , NULL,  30);

row created.

SQL> insert into emp values(13,'Fake','MG',   'TRAINER', 4,date '1959-02-13',  3000, NULL,  20);

row created.

SQL> insert into emp values(14,'Mike','TJA','Manager',   7,date '1962-01-23',  1300, NULL,  10);

row created.

SQL>
SQL> create table departments
  2  deptno NUMBER(2)     constraint D_PK primary key
  3  , dname  VARCHAR2(10)
  4  , location VARCHAR2(8)
  5  , mgr    NUMBER(4)
  6  ;

Table created.

SQL>
SQL> insert into departments values (10,'ACCOUNTING','NEW YORK',7);

row created.

SQL> insert into departments values (20,'TRAINING',  'DALLAS',  4);

row created.

SQL> insert into departments values (30,'SALES',     'CHICAGO', 6);

row created.

SQL> insert into departments values (40,'HR',        'BOSTON',  9);

row created.

SQL>
SQL> create view empdept_v as
  2  select e.empno
  3  ,      e.ENAME
  4  ,      e.init
  5  ,      d.dname
  6  ,      d.location
  7  ,      m.ENAME    as Designer
  8  from   emp   e
  9         join
 10         departments d using (deptno)
 11         join
 12         emp   m on (m.empno = d.mgr);


SQL> drop table emp;

Table dropped.

SQL> drop table departments;

Table dropped.
8.1.Create View
8.1.1.Views
8.1.2.Creating and Using a View
8.1.3.Creating and Using Simple Views
8.1.4.Choose specific column from base table
8.1.5.Creating a View with a CHECK OPTION Constraint
8.1.6.Creating a View with a READ ONLY Constraint
8.1.7.Create view based on user-defined function
8.1.8.Create a view by joining two tables
8.1.9.Create view based on aggregate function
8.1.10.a user-defined type view
8.1.11.CREATE MATERIALIZED VIEW with TABLESPACE
8.1.12.CREATE MATERIALIZED VIEW with rowid
8.1.13.Create view by join three tables
8.1.14.Create view on single field of a type
8.1.15.create materialized view emp_dept build immediate refresh on demand enable query rewrite
8.1.16.Use view based on user-defind type
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