Using the Set Operators : Introduction « Set « 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 » Set » Introduction

3. 1. 1. Using the Set Operators

Operator	Description
UNION ALL	Returns all the rows retrieved by the queries, including duplicate rows.
UNION	Returns all non-duplicate rows retrieved by the queries.
INTERSECT	Returns rows that are retrieved by both queries.
MINUS	Returns the remaining rows when the rows retrieved by the second query are subtracted from the rows retrieved by the first query.

Although the column names may be different, the number of columns and the column types returned by the queries must match.

3. 1. Introduction
	3. 1. 1.	Using the Set Operators
	3. 1. 2.	Combining Set Operators
	3. 1. 3.	Intersect first then union

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