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Beginning SQL Queries
From Novice to Professional
SQL for Beginners
Second Edition
Learn Programminh SQL Very Easy
Clare Churcher
Contents at a Glance About the Technical Reviewer - photo 1Contents at a Glance About the Technical Reviewer - photo 2
Contents at a Glance
About the Technical Reviewer ...............................................................................xviiAcknowledgments ..................................................................................................xixIntroduction ............................................................................................................xxi
Chapter 1: Relational Database Overview ............................................................. 1Chapter 2: Simple Queries on One Table .............................................................. 15Chapter 3: A First Look at Joins .......................................................................... 33Chapter 4: Subqueries ......................................................................................... 51Chapter 5: Self Joins ........................................................................................... 67Chapter 6: Multiple Relationships Between Tables ............................................. 85Chapter 7: Set Operations .................................................................................... 99Chapter 8: Aggregate Operations ...................................................................... 129Chapter 9: Window Functions ............................................................................ 147Chapter 10: Efficiency Considerations ............................................................... 161Chapter 11: How to Tackle a Query ................................................................... 175Chapter 12: Common Problems ......................................................................... 195Appendix 1: Example Database ......................................................................... 211Appendix 2: Relational Notation ........................................................................ 213
Index .....................................................................................................................233
v
Contents
About the Technical Reviewer ...............................................................................xviiAcknowledgments ..................................................................................................xixIntroduction ............................................................................................................xxi
Chapter 1: Relational Database Overview ............................................................. 1

Process Approach ................................................................................................................................. 10
Outcome Approach ............................................................................................................................... 11

Summary ........................................................................................................................13
vii
Dealing with Nulls .......................................................................................................... 23
Summary ........................................................................................................................32
Cartesian Product ................................................................................................................................. 33Inner Join .............................................................................................................................................. 35
Other Types of Joins ....................................................................................................... 44
Summary ........................................................................................................................48

viii

Summary ........................................................................................................................64
Self Relationships ........................................................................................................... 67
Questions Involving Both............................................................................................. 79
Summary ........................................................................................................................82
Union ............................................................................................................................ 105
Intersection .................................................................................................................. 111
Difference ..................................................................................................................... 118
Division ......................................................................................................................... 122
Summary ......................................................................................................................126


Division ............................................................................................................................................... 128

Grouping ....................................................................................................................... 135
Summary ......................................................................................................................146
x
Summary ......................................................................................................................159
Chapter 10: Efficiency Considerations ............................................................... 161
Join Techniques ............................................................................................................ 168
Summary ......................................................................................................................173
Big Picture Method ....................................................................................................... 181
Spotting Keywords in Questions .................................................................................. 184
No Idea Where to Start? ............................................................................................... 189
Checking Queries ......................................................................................................... 191

xii

Summary ......................................................................................................................193
Problems with Data Values ........................................................................................... 201
Diagnosing Problems ................................................................................................... 203
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