Performing SELECT Statements that Use More than Two Tables : Introduction « Table Joins « Oracle PL/SQL Tutorial

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

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Oracle PL/SQL Tutorial » Table Joins » Introduction

7. 1. 1. Performing SELECT Statements that Use More than Two Tables

Joins can be used to connect any number of tables.

The number of joins you will need in your WHERE clause is total_number_of_tables - 1

There are two types of join conditions, which are based on the operator.

Equijoins - You use the equality operator (=) in the join.

Non-equijoins - You use an operator other than equals in the join, such as <, >, BETWEEN, and so on.

7. 1. Introduction
	7. 1. 1.	Performing SELECT Statements that Use More than Two Tables
	7. 1. 2.	Three different types of joins:
	7. 1. 3.	Understanding Non-equijoins
	7. 1. 4.	Performing SELECT Statements that Use Two Tables
	7. 1. 5.	Example simple join.
	7. 1. 6.	Use table alias in table join
	7. 1. 7.	Convert subqueries to JOINs
	7. 1. 8.	autotrace ansi full outer join

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