
SQL Cookbook
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Content
- Cover
- Copyright
- Table of Contents
- Preface
- Who This Book Is For
- What's Missing from This Book
- Platform and Version
- Tables Used in This Book
- Conventions Used in This Book
- Typographical Conventions
- Coding Conventions
- O'Reilly Online Learning
- How to Contact Us
- Second Edition Acknowledgments
- First Edition Acknowledgments
- Chapter 1. Retrieving Records
- 1.1 Retrieving All Rows and Columns from a Table
- Problem
- Solution
- Discussion
- 1.2 Retrieving a Subset of Rows from a Table
- Problem
- Solution
- Discussion
- 1.3 Finding Rows That Satisfy Multiple Conditions
- Problem
- Solution
- Discussion
- 1.4 Retrieving a Subset of Columns from a Table
- Problem
- Solution
- Discussion
- 1.5 Providing Meaningful Names for Columns
- Problem
- Solution
- Discussion
- 1.6 Referencing an Aliased Column in the WHERE Clause
- Problem
- Solution
- Discussion
- 1.7 Concatenating Column Values
- Problem
- Solution
- Discussion
- 1.8 Using Conditional Logic in a SELECT Statement
- Problem
- Solution
- Discussion
- 1.9 Limiting the Number of Rows Returned
- Problem
- Solution
- Discussion
- 1.10 Returning n Random Records from a Table
- Problem
- Solution
- Discussion
- 1.11 Finding Null Values
- Problem
- Solution
- Discussion
- 1.12 Transforming Nulls into Real Values
- Problem
- Solution
- Discussion
- 1.13 Searching for Patterns
- Problem
- Solution
- Discussion
- 1.14 Summing Up
- Chapter 2. Sorting Query Results
- 2.1 Returning Query Results in a Specified Order
- Problem
- Solution
- Discussion
- 2.2 Sorting by Multiple Fields
- Problem
- Solution
- Discussion
- 2.3 Sorting by Substrings
- Problem
- Solution
- Discussion
- 2.4 Sorting Mixed Alphanumeric Data
- Problem
- Solution
- Discussion
- 2.5 Dealing with Nulls When Sorting
- Problem
- Solution
- Discussion
- 2.6 Sorting on a Data-Dependent Key
- Problem
- Solution
- Discussion
- 2.7 Summing Up
- Chapter 3. Working with Multiple Tables
- 3.1 Stacking One Rowset atop Another
- Problem
- Solution
- Discussion
- 3.2 Combining Related Rows
- Problem
- Solution
- Discussion
- 3.3 Finding Rows in Common Between Two Tables
- Problem
- Solution
- Discussion
- 3.4 Retrieving Values from One Table That Do Not Exist in Another
- Problem
- Solution
- Discussion
- 3.5 Retrieving Rows from One Table That Do Not Correspond to Rows in Another
- Problem
- Solution
- Discussion
- 3.6 Adding Joins to a Query Without Interfering with Other Joins
- Problem
- Solution
- Discussion
- See Also
- 3.7 Determining Whether Two Tables Have the Same Data
- Problem
- Solution
- Discussion
- 3.8 Identifying and Avoiding Cartesian Products
- Problem
- Solution
- Discussion
- 3.9 Performing Joins When Using Aggregates
- Problem
- Solution
- Discussion
- 3.10 Performing Outer Joins When Using Aggregates
- Problem
- Solution
- Discussion
- 3.11 Returning Missing Data from Multiple Tables
- Problem
- Solution
- Discussion
- 3.12 Using NULLs in Operations and Comparisons
- Problem
- Solution
- Discussion
- 3.13 Summing Up
- Chapter 4. Inserting, Updating, and Deleting
- 4.1 Inserting a New Record
- Problem
- Solution
- Discussion
- 4.2 Inserting Default Values
- Problem
- Solution
- Discussion
- 4.3 Overriding a Default Value with NULL
- Problem
- Solution
- Discussion
- 4.4 Copying Rows from One Table into Another
- Problem
- Solution
- Discussion
- 4.5 Copying a Table Definition
- Problem
- Solution
- Discussion
- 4.6 Inserting into Multiple Tables at Once
- Problem
- Solution
- Discussion
- 4.7 Blocking Inserts to Certain Columns
- Problem
- Solution
- Discussion
- 4.8 Modifying Records in a Table
- Problem
- Solution
- Discussion
- 4.9 Updating When Corresponding Rows Exist
- Problem
- Solution
- Discussion
- 4.10 Updating with Values from Another Table
- Problem
- Solution
- Discussion
- 4.11 Merging Records
- Problem
- Solution
- Discussion
- 4.12 Deleting All Records from a Table
- Problem
- Solution
- Discussion
- 4.13 Deleting Specific Records
- Problem
- Solution
- Discussion
- 4.14 Deleting a Single Record
- Problem
- Solution
- Discussion
- 4.15 Deleting Referential Integrity Violations
- Problem
- Solution
- Discussion
- 4.16 Deleting Duplicate Records
- Problem
- Solution
- Discussion
- 4.17 Deleting Records Referenced from Another Table
- Problem
- Solution
- Discussion
- 4.18 Summing Up
- Chapter 5. Metadata Queries
- 5.1 Listing Tables in a Schema
- Problem
- Solution
- Discussion
- 5.2 Listing a Table's Columns
- Problem
- Solution
- Discussion
- 5.3 Listing Indexed Columns for a Table
- Problem
- Solution
- Discussion
- 5.4 Listing Constraints on a Table
- Problem
- Solution
- Discussion
- 5.5 Listing Foreign Keys Without Corresponding Indexes
- Problem
- Solution
- Discussion
- 5.6 Using SQL to Generate SQL
- Problem
- Solution
- Discussion
- 5.7 Describing the Data Dictionary Views in an Oracle Database
- Problem
- Solution
- Discussion
- 5.8 Summing Up
- Chapter 6. Working with Strings
- 6.1 Walking a String
- Problem
- Solution
- Discussion
- 6.2 Embedding Quotes Within String Literals
- Problem
- Solution
- Discussion
- 6.3 Counting the Occurrences of a Character in a String
- Problem
- Solution
- Discussion
- 6.4 Removing Unwanted Characters from a String
- Problem
- Solution
- Discussion
- 6.5 Separating Numeric and Character Data
- Problem
- Solution
- Discussion
- 6.6 Determining Whether a String Is Alphanumeric
- Problem
- Solution
- Discussion
- 6.7 Extracting Initials from a Name
- Problem
- Solution
- Discussion
- 6.8 Ordering by Parts of a String
- Problem
- Solution
- Discussion
- 6.9 Ordering by a Number in a String
- Problem
- Solution
- Discussion
- 6.10 Creating a Delimited List from Table Rows
- Problem
- Solution
- Discussion
- 6.11 Converting Delimited Data into a Multivalued IN-List
- Problem
- Solution
- Discussion
- 6.12 Alphabetizing a String
- Problem
- Solution
- Discussion
- 6.13 Identifying Strings That Can Be Treated as Numbers
- Problem
- Solution
- Discussion
- 6.14 Extracting the nth Delimited Substring
- Problem
- Solution
- Discussion
- 6.15 Parsing an IP Address
- Problem
- Solution
- Discussion
- 6.16 Comparing Strings by Sound
- Problem
- Solution
- Discussion
- 6.17 Finding Text Not Matching a Pattern
- Problem
- Solution
- Discussion
- 6.18 Summing Up
- Chapter 7. Working with Numbers
- 7.1 Computing an Average
- Problem
- Solution
- Discussion
- See Also
- 7.2 Finding the Min/Max Value in a Column
- Problem
- Solution
- Discussion
- See Also
- 7.3 Summing the Values in a Column
- Problem
- Solution
- Discussion
- See Also
- 7.4 Counting Rows in a Table
- Problem
- Solution
- Discussion
- See Also
- 7.5 Counting Values in a Column
- Problem
- Solution
- Discussion
- 7.6 Generating a Running Total
- Problem
- Solution
- Discussion
- 7.7 Generating a Running Product
- Problem
- Solution
- Discussion
- 7.8 Smoothing a Series of Values
- Problem
- Solution
- Discussion
- 7.9 Calculating a Mode
- Problem
- Solution
- Discussion
- See Also
- 7.10 Calculating a Median
- Problem
- Solution
- Discussion
- 7.11 Determining the Percentage of a Total
- Problem
- Solution
- Discussion
- 7.12 Aggregating Nullable Columns
- Problem
- Solution
- Discussion
- 7.13 Computing Averages Without High and Low Values
- Problem
- Solution
- Discussion
- 7.14 Converting Alphanumeric Strings into Numbers
- Problem
- Solution
- Discussion
- 7.15 Changing Values in a Running Total
- Problem
- Solution
- Discussion
- 7.16 Finding Outliers Using the Median Absolute Deviation
- Problem
- Solution
- Discussion
- 7.17 Finding Anomalies Using Benford's Law
- Problem
- Solution
- Discussion
- 7.18 Summing Up
- Chapter 8. Date Arithmetic
- 8.1 Adding and Subtracting Days, Months, and Years
- Problem
- Solution
- Discussion
- 8.2 Determining the Number of Days Between Two Dates
- Problem
- Solution
- Discussion
- 8.3 Determining the Number of Business Days Between Two Dates
- Problem
- Solution
- Discussion
- 8.4 Determining the Number of Months or Years Between Two Dates
- Problem
- Solution
- Discussion
- 8.5 Determining the Number of Seconds, Minutes, or Hours Between Two Dates
- Problem
- Solution
- Discussion
- 8.6 Counting the Occurrences of Weekdays in a Year
- Problem
- Solution
- Discussion
- 8.7 Determining the Date Difference Between the Current Record and the Next Record
- Problem
- Solution
- Discussion
- 8.8 Summing Up
- Chapter 9. Date Manipulation
- 9.1 Determining Whether a Year Is a Leap Year
- Problem
- Solution
- Discussion
- 9.2 Determining the Number of Days in a Year
- Problem
- Solution
- Discussion
- 9.3 Extracting Units of Time from a Date
- Problem
- Solution
- Discussion
- 9.4 Determining the First and Last Days of a Month
- Problem
- Solution
- Discussion
- 9.5 Determining All Dates for a Particular Weekday Throughout a Year
- Problem
- Solution
- Discussion
- 9.6 Determining the Date of the First and Last Occurrences of a Specific Weekday in a Month
- Problem
- Solution
- Discussion
- 9.7 Creating a Calendar
- Problem
- Solution
- Discussion
- 9.8 Listing Quarter Start and End Dates for the Year
- Problem
- Solution
- Discussion
- 9.9 Determining Quarter Start and End Dates for a Given Quarter
- Problem
- Solution
- Discussion
- 9.10 Filling in Missing Dates
- Problem
- Solution
- Discussion
- 9.11 Searching on Specific Units of Time
- Problem
- Solution
- Discussion
- 9.12 Comparing Records Using Specific Parts of a Date
- Problem
- Solution
- Discussion
- 9.13 Identifying Overlapping Date Ranges
- Problem
- Solution
- Discussion
- 9.14 Summing Up
- Chapter 10. Working with Ranges
- 10.1 Locating a Range of Consecutive Values
- Problem
- Solution
- Discussion
- 10.2 Finding Differences Between Rows in the Same Group or Partition
- Problem
- Solution
- 10.3 Locating the Beginning and End of a Range of Consecutive Values
- Problem
- Solution
- Discussion
- 10.4 Filling in Missing Values in a Range of Values
- Problem
- Solution
- Discussion
- 10.5 Generating Consecutive Numeric Values
- Problem
- Solution
- Discussion
- 10.6 Summing Up
- Chapter 11. Advanced Searching
- 11.1 Paginating Through a Result Set
- Problem
- Solution
- Discussion
- 11.2 Skipping n Rows from a Table
- Problem
- Solution
- Discussion
- 11.3 Incorporating OR Logic When Using Outer Joins
- Problem
- Solution
- Discussion
- 11.4 Determining Which Rows Are Reciprocals
- Problem
- Solution
- Discussion
- 11.5 Selecting the Top n Records
- Problem
- Solution
- Discussion
- 11.6 Finding Records with the Highest and Lowest Values
- Problem
- Solution
- Discussion
- 11.7 Investigating Future Rows
- Problem
- Solution
- Discussion
- See Also
- 11.8 Shifting Row Values
- Problem
- Solution
- Discussion
- 11.9 Ranking Results
- Problem
- Solution
- Discussion
- 11.10 Suppressing Duplicates
- Problem
- Solution
- Discussion
- 11.11 Finding Knight Values
- Problem
- Solution
- Discussion
- 11.12 Generating Simple Forecasts
- Problem
- Solution
- Discussion
- 11.13 Summing Up
- Chapter 12. Reporting and Reshaping
- 12.1 Pivoting a Result Set into One Row
- Problem
- Solution
- Discussion
- 12.2 Pivoting a Result Set into Multiple Rows
- Problem
- Solution
- Discussion
- 12.3 Reverse Pivoting a Result Set
- Problem
- Solution
- Discussion
- 12.4 Reverse Pivoting a Result Set into One Column
- Problem
- Solution
- Discussion
- 12.5 Suppressing Repeating Values from a Result Set
- Problem
- Solution
- Discussion
- 12.6 Pivoting a Result Set to Facilitate Inter-Row Calculations
- Problem
- Solution
- Discussion
- 12.7 Creating Buckets of Data, of a Fixed Size
- Problem
- Solution
- Discussion
- 12.8 Creating a Predefined Number of Buckets
- Problem
- Solution
- Discussion
- 12.9 Creating Horizontal Histograms
- Problem
- Solution
- Discussion
- 12.10 Creating Vertical Histograms
- Problem
- Solution
- Discussion
- 12.11 Returning Non-GROUP BY Columns
- Problem
- Solution
- Discussion
- 12.12 Calculating Simple Subtotals
- Problem
- Solution
- Discussion
- 12.13 Calculating Subtotals for All Possible Expression Combinations
- Problem
- Solution
- Discussion
- 12.14 Identifying Rows That Are Not Subtotals
- Problem
- Solution
- Discussion
- 12.15 Using Case Expressions to Flag Rows
- Problem
- Solution
- Discussion
- 12.16 Creating a Sparse Matrix
- Problem
- Solution
- Discussion
- 12.17 Grouping Rows by Units of Time
- Problem
- Solution
- Discussion
- 12.18 Performing Aggregations over Different Groups/Partitions Simultaneously
- Problem
- Solution
- Discussion
- 12.19 Performing Aggregations over a Moving Range of Values
- Problem
- Solution
- Discussion
- 12.20 Pivoting a Result Set with Subtotals
- Problem
- Solution
- Discussion
- 12.21 Summing Up
- Chapter 13. Hierarchical Queries
- 13.1 Expressing a Parent-Child Relationship
- Problem
- Solution
- Discussion
- 13.2 Expressing a Child-Parent-Grandparent Relationship
- Problem
- Solution
- Discussion
- 13.3 Creating a Hierarchical View of a Table
- Problem
- Solution
- Discussion
- 13.4 Finding All Child Rows for a Given Parent Row
- Problem
- Solution
- Discussion
- 13.5 Determining Which Rows Are Leaf, Branch, or Root Nodes
- Problem
- Solution
- Discussion
- 13.6 Summing Up
- Chapter 14. Odds 'n' Ends
- 14.1 Creating Cross-Tab Reports Using SQL Server's PIVOT Operator
- Problem
- Solution
- Discussion
- 14.2 Unpivoting a Cross-Tab Report Using SQL Server's UNPIVOT Operator
- Problem
- Solution
- 14.3 Transposing a Result Set Using Oracle's MODEL Clause
- Problem
- Solution
- Discussion
- 14.4 Extracting Elements of a String from Unfixed Locations
- Problem
- Solution
- Discussion
- 14.5 Finding the Number of Days in a Year (an Alternate Solution for Oracle)
- Problem
- Solution
- Discussion
- 14.6 Searching for Mixed Alphanumeric Strings
- Problem
- Solution
- Discussion
- 14.7 Converting Whole Numbers to Binary Using Oracle
- Problem
- Solution
- Discussion
- 14.8 Pivoting a Ranked Result Set
- Problem
- Solution
- Discussion
- 14.9 Adding a Column Header into a Double Pivoted Result Set
- Problem
- Solution
- Discussion
- 14.10 Converting a Scalar Subquery to a Composite Subquery in Oracle
- Problem
- Solution
- Discussion
- 14.11 Parsing Serialized Data into Rows
- Problem
- Solution
- Discussion
- 14.12 Calculating Percent Relative to Total
- Problem
- Solution
- Discussion
- 14.13 Testing for Existence of a Value Within a Group
- Problem
- Solution
- Discussion
- 14.14 Summing Up
- Appendix A. Window Function Refresher
- Grouping
- Definition of an SQL Group
- Paradoxes
- Relationship Between SELECT and GROUP BY
- Windowing
- A Simple Example
- Order of Evaluation
- Partitions
- Effect of NULLs
- When Order Matters
- The Framing Clause
- A Framing Finale
- Readability + Performance = Power
- Providing a Base
- Appendix B. Common Table Expressions
- Subqueries
- Common Table Expressions
- Summing Up
- Index
- About the Authors
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