Beginning Oracle Database 11g Administration From Novice to Professional

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38 CHAPTER 2 SQL AND PL/SQL Introduction to PL/SQL Oracle gives us the ability to store programs in the database—and these programs are often written by using a proprietary Oracle language called Procedural Language/SQL, or PL/SQL. PL/SQL offers the entire suite of structured programming mechanisms such as condition checking, loops, and subroutines. Of course, just like programs written in other languages, PL/SQL programs communicate with Oracle by using SQL. Here is an example of a PL/SQL program to delete a supplier record and any associated quote records—first a flow chart in Figure 2-5, and then the actual program itself in Listing 2-21. 6 PROCEDURE delete_supplier (suppliername_in IN VARCHAR) DELETE FROM supplier WHERE suppliername = suppliername_in; Yes ROWCOUNT > 0 ? No No Error? Yes No SQLCODE = -2292? Child records were found. Delete those first. Yes Display success message Display error message Display error message DELETE FROM quote WHERE suppliername = suppliername_in; Yes Error? No Now try deleting the parent again. Display error message DELETE FROM supplier WHERE suppliername = suppliername_in; Yes Error? No End Display error message Display success message Figure 2-5. Flow chart for the procedure 6. If the and tables are related by referential constraints and the option is included in the definition of the table, Oracle will automatically delete a record when the corresponding record is deleted. For the purposes of this example, we assume that this option has not been used.
CHAPTER 2 SQL AND PL/SQL 39 Listing 2-21. PL/SQL Program to Delete a Supplier Record and All Associated Quote Records
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Beginning Oracle Database 11g Admin
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For Michelle. “Oh Fame!—if I e
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PART III Database Support CHAPTE
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viii CONTENTS CHAPTER 2 SQL and PL/
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x CONTENTS Client Installations ...
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xii CONTENTS Data Loading .........
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Page 18 and 19: About the Author IGGY FERNANDEZ has
Page 20 and 21: Acknowledgments I would like to tha
Page 22 and 23: xxvi INTRODUCTION Who This Book Is
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Page 26 and 27: xxx INTRODUCTION Chapter 14: Databa
Page 28 and 29: PART I Database Concepts
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132 CHAPTER 7 PHYSICAL DATABASE DE
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152 CHAPTER 8 USER MANAGEMENT AND
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PART III Database Support
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186 CHAPTER 9 TAKING CONTROL Listi
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CHAPTER 11 Fixing Problems Rise and
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CHAPTER 11 FIXING PROBLEMS 225 3.
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CHAPTER 11 FIXING PROBLEMS 239 Rem
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CHAPTER 12 Backups As to our Conduc
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CHAPTER 12 BACKUPS 257 resources u
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CHAPTER 12 BACKUPS 275 Figure 12-2
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CHAPTER 13 Recovery These Officers,
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CHAPTER 13 RECOVERY 281 base admin
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CHAPTER 13 RECOVERY 289 Figure 13-
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CHAPTER 14 Database Maintenance “
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CHAPTER 14 DATABASE MAINTENANCE 30
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CHAPTER 15 The Big Picture and the
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PART IV Database Tuning
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416 CHAPTER 17 SQL TUNING Lewis, J
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418 INDEX backout section, 349 back
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420 INDEX databases administration
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422 INDEX Enable Automatic Maintena
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424 INDEX Listener Configuration, 9
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428 INDEX SHOW ALL command, 269 SHO
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Beginning Oracle Database 11g Administration From Novice to Professional

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