Beginning Oracle Database 11g Administration From Novice to Professional

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28 CHAPTER 2 SQL AND PL/SQL The DELETE Statement The statement enables us to specify a subset of data rows to delete. The statement shown in Listing 2-7 removes the entry for TOOL TIME, INC. Listing 2-7. DML Command to Delete a Data Record from the Supplier Table Note that the preceding statement will fail because of the presence of child records in the table. Presumably, the intention is to also remove these records, in which case you need to delete them first by using a similar command. The MERGE Statement is a powerful statement that combines the capabilities of the statement, the statement, and the statement. Consider the following example. Suppose you have new quotes in a table called . If a revised quote has been provided for a part that was previously supplied by a supplier, the corresponding record in the table has to be updated. If a quote has been provided for a part that was not previously supplied by a supplier, a new record has to be inserted into the table. Finally, a quote of 0 indicates that the supplier no longer supplies the part. You can merge the contents of the table into the table by using the statement—inserting, updating, or deleting records as necessary—as shown in Listing 2-8. Listing 2-8. DML Command to Merge the Contents of One Table into Another Table
CHAPTER 2 SQL AND PL/SQL 29 Embedded SQL Application programs written by application software developers can communicate with an Oracle database only by using SQL. These application programs must therefore be linked with Oracle- supplied routines that give them the capability to communicate with an Oracle database. Listing 2-9 shows an example of SQL statements embedded in a Java program. Each embedded SQL statement is prefixed with the phrase . The program lists the names of all parts supplied by a specified supplier and the price quote in each case; the account name and password required to connect to the database have to be provided to the program at runtime. Listing 2-9. SQL Commands Embedded in a Java Program
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Beginning Oracle Database 11g Admin
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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
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CHAPTER 5 Software Installation The
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CHAPTER 5 SOFTWARE INSTALLATION 83
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132 CHAPTER 7 PHYSICAL DATABASE DE
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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 12 Backups As to our Conduc
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CHAPTER 13 Recovery These Officers,
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CHAPTER 13 RECOVERY 281 base admin
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CHAPTER 14 Database Maintenance “
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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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