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Variables................................................................................................................................................. 34 Operators, Operands, Conditions, and Expressions................................................................................ 34 Arithmetic Operators ......................................................................................................................... 35 The Alphanumeric Operator: Concatenation...................................................................................... 35 Comparison Operators....................................................................................................................... 35 Logical Operators .............................................................................................................................. 36 Expressions ....................................................................................................................................... 36 Functions ................................................................................................................................................ 37 Database Object Naming ........................................................................................................................ 38 Comments .............................................................................................................................................. 39 Reserved Words...................................................................................................................................... 39
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2.3 Introduction to SQL*Plus............................................................................................39
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Entering Commands ............................................................................................................................... 40 Using the SQL Buffer .............................................................................................................................. 41 Using an External Editor ......................................................................................................................... 42 Using the SQL*Plus Editor ...................................................................................................................... 43 Using SQL Buffer Line Numbers ........................................................................................................ 46 Using the Ellipsis ............................................................................................................................... 48 SQL*Plus Editor Command Review.................................................................................................... 48 Saving Commands.................................................................................................................................. 49 Running SQL*Plus Scripts ...................................................................................................................... 51 Specifying Directory Path Specifications................................................................................................ 52 Adjusting SQL*Plus Settings................................................................................................................... 53 Spooling a SQL*Plus Session.................................................................................................................. 56 Describing Database Objects.................................................................................................................. 57 Executing Commands from the Operating System................................................................................. 57 Clearing the Buffer and the Screen ........................................................................................................ 57 SQL*Plus Command Review ................................................................................................................... 57
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2.4 Introduction to SQL Developer ...................................................................................58
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Installing and Configuring SQL Developer .............................................................................................. 58 Connecting to a Database....................................................................................................................... 61 Exploring Objects.................................................................................................................................... 62 Entering Commands ............................................................................................................................... 63 Run Statement................................................................................................................................... 64 Run Script.......................................................................................................................................... 65 Saving Commands to a Script ................................................................................................................ 66 Running a Script ..................................................................................................................................... 67
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3: Data Definition, Part I ..........................................................................71 3.1 Schemas and Users ...................................................................................................71 3.2 Table Creation............................................................................................................72 3.3 Datatypes...................................................................................................................73 3.4 Commands for Creating the Case Tables ..................................................................75 3.5 The Data Dictionary ...................................................................................................77 4: Retrieval: The Basics...........................................................................83 4.1 Overview of the SELECT Command ...........................................................................83 4.2 The SELECT Clause ....................................................................................................85
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Column Aliases ....................................................................................................................................... 86 The DISTINCT Keyword........................................................................................................................... 87 Column Expressions ............................................................................................................................... 87 The DUAL Table ................................................................................................................................. 88 Null Values in Expressions................................................................................................................. 90
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4.3 The WHERE Clause ....................................................................................................90 4.4 The ORDER BY Clause................................................................................................91 4.5 AND, OR, and NOT......................................................................................................94
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The OR Operator ..................................................................................................................................... 94 The AND Operator and Operator Precedence Issues .............................................................................. 95 vii
CONTENTS
The NOT Operator ................................................................................................................................... 96
4.6 BETWEEN, IN, and LIKE..............................................................................................98
The BETWEEN Operator .......................................................................................................................... 98 The IN Operator ...................................................................................................................................... 99 The LIKE Operator................................................................................................................................. 100
4.7 CASE Expressions ....................................................................................................101 4.8 Subqueries...............................................................................................................104
The Joining Condition ........................................................................................................................... 105 When a Subquery Returns Too Many Values........................................................................................ 106 Comparison Operators in the Joining Condition ................................................................................... 107 When a Single-Row Subquery Returns More Than One Row ............................................................... 108
4.9 Null Values...............................................................................................................109
Null Value Display................................................................................................................................. 109 The Nature of Null Values ..................................................................................................................... 109 The IS NULL Operator ........................................................................................................................... 111 Null Values and the Equality Operator .................................................................................................. 112 Null Value Pitfalls.................................................................................................................................. 113
4.10 Truth Tables...........................................................................................................114 4.11 Exercises ...............................................................................................................116 5: Retrieval: Functions ..........................................................................117 5.1 Overview of Functions .............................................................................................117 5.2 Arithmetic Functions................................................................................................119 5.3 Text Functions .........................................................................................................121 5.4 Regular Expressions ................................................................................................125
Regular Expression Operators and Metasymbols................................................................................. 126 Regular Expression Function Syntax .................................................................................................... 127 Influencing Matching Behavior........................................................................................................ 127 REGEXP_INSTR Return Value........................................................................................................... 128
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CONTENTS
REGEXP_LIKE........................................................................................................................................ 128 REGEXP_INSTR ..................................................................................................................................... 129 REGEXP_SUBSTR.................................................................................................................................. 130 REGEXP_REPLACE ................................................................................................................................ 130
5.5 Date Functions.........................................................................................................131
EXTRACT ............................................................................................................................................... 132 ROUND and TRUNC ............................................................................................................................... 133 MONTHS_BETWEEN and ADD_MONTHS............................................................................................... 133 NEXT_DAY and LAST_DAY.................................................................................................................... 134
5.6 General Functions....................................................................................................134
GREATEST and LEAST........................................................................................................................... 135 NVL ....................................................................................................................................................... 136 DECODE ................................................................................................................................................ 136
5.7 Conversion Functions ..............................................................................................137
TO_NUMBER and TO_CHAR.................................................................................................................. 138 Conversion Function Formats............................................................................................................... 139 Datatype Conversion............................................................................................................................. 141 CAST ..................................................................................................................................................... 141
5.8 Stored Functions......................................................................................................142 5.9 Exercises .................................................................................................................143 6: Data Manipulation .............................................................................145 6.1 The INSERT Command .............................................................................................146
Standard INSERT Commands ............................................................................................................... 146 INSERT Using Subqueries..................................................................................................................... 149
6.2 The UPDATE Command............................................................................................151 6.3 The DELETE Command.............................................................................................154 6.4 The MERGE Command .............................................................................................157 6.5 Transaction Processing ...........................................................................................159
CONTENTS
6.6 Locking and Read Consistency................................................................................160
Locking ................................................................................................................................................. 160 Read Consistency ................................................................................................................................. 161
7: Data Definition, Part II.......................................................................163 7.1 The CREATE TABLE Command.................................................................................163 7.2 More on Datatypes...................................................................................................165
Character Datatypes ............................................................................................................................. 166 Comparison Semantics.................................................................................................................... 167 Column Data Interpretation ............................................................................................................. 167 Numbers Revisited ............................................................................................................................... 167
7.3 The ALTER TABLE and RENAME Commands............................................................167 7.4 Constraints...............................................................................................................170
Out-of-Line Constraints ........................................................................................................................ 170 Inline Constraints.................................................................................................................................. 172 Constraint Definitions in the Data Dictionary........................................................................................ 173 Case Table Definitions with Constraints............................................................................................... 174 A Solution for Foreign Key References: CREATE SCHEMA.................................................................... 176 Deferrable Constraints.......................................................................................................................... 177
7.5 Indexes ....................................................................................................................178
Index Creation....................................................................................................................................... 179 Unique Indexes ................................................................................................................................ 180 Bitmap Indexes................................................................................................................................ 180 Function-Based Indexes .................................................................................................................. 180 Index Management............................................................................................................................... 181
7.6 Performance Monitoring with SQL Developer AUTOTRACE......................................182 7.7 Sequences ...............................................................................................................185 7.8 Synonyms ................................................................................................................186 7.9 The CURRENT_SCHEMA Setting ..............................................................................188
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