Chapter 18: Modifying SAS Data Sets and Tracking Changes
by SAS Institute
SAS Certification Prep Guide, 4th Edition
- Title Page
- Copyright
- About This Book
- Chapter 1: Performing Queries Using PROC SQL
- Chapter 1: Performing Queries Using PROC SQL
- Chapter 2: Performing Advanced Queries Using PROC SQL
- Overview
- Viewing SELECT Statement Syntax
- Displaying All Columns
- Limiting the Number of Rows Displayed
- Eliminating Duplicate Rows from Output
- Subsetting Rows By Using Conditional Operators
- Subsetting Rows By Using Calculated Values
- Enhancing Query Output
- Summarizing and Grouping Data
- Subsetting Data By Using Subqueries
- Subsetting Data By Using Noncorrelated Subqueries
- Subsetting Data By Using Correlated Subqueries
- Validating Query Syntax
- Additional Features
- Summary
- Quiz
- Chapter 3: Combining Tables Horizontally Using PROC SQL
- Chapter 4: Combining Tables Vertically Using PROC SQL
- Chapter 5: Creating and Managing Tables Using PROC SQL
- Overview
- Understanding Methods of Creating Tables
- Creating an Empty Table By Defining Columns
- Displaying the Structure of a Table
- Creating an Empty Table That Is like Another Table
- Creating a Table from a Query Result
- Inserting Rows of Data into a Table
- Creating a Table That Has Integrity Constraints
- Handling Errors in Row Insertions
- Displaying Integrity Constraints for a Table
- Updating Values in Existing Table Rows
- Deleting Rows in a Table
- Altering Columns in a Table
- Dropping Tables
- Summary
- Quiz
- Chapter 6: Creating and Managing Indexes Using PROC SQL
- Chapter 7: Creating and Managing Views Using PROC SQL
- Chapter 8: Managing Processing Using PROC SQL
- Chapter 9: Introducing Macro Variables
- Chapter 9: Introducing Macro Variables
- Overview
- Basic Concepts
- Using Automatic Macro Variables
- Using User-Defined Macro Variables
- Processing Macro Variables
- Displaying Macro Variable Values in the SAS Log
- Using Macro Functions to Mask Special Characters
- Using Macro Functions to Manipulate Character Strings
- Using SAS Functions with Macro Variables
- Combining Macro Variable References with Text
- Summary
- Quiz
- Chapter 10: Processing Macro Variables at Execution Time
- Overview
- Creating a Macro Variable during DATA Step Execution
- Creating Multiple Macro Variables during DATA Step Execution
- Referencing Macro Variables Indirectly
- Obtaining Macro Variable Values during DATA Step Execution
- Creating Macro Variables during PROC SQL Step Execution
- Working with PROC SQL Views
- Using Macro Variables in SCL Programs
- Summary
- Quiz
- Chapter 11: Creating and Using Macro Programs
- Chapter 12: Storing Macro Programs
- Chapter 9: Introducing Macro Variables
- Chapter 13: Creating Indexes
- Chapter 13: Creating Indexes
- Chapter 14: Combining Data Vertically
- Chapter 15: Combining Data Horizontally
- Overview
- Reviewing Terminology
- Working with Lookup Values Outside of SAS Data Sets
- Combining Data with the DATA Step Match-Merge
- Using PROC SQL to Join Data
- Comparing DATA Step Match-Merges and PROC SQL Joins
- Combining Summary Data and Detail Data
- Using an Index to Combine Data
- Using a Transaction Data Set
- Summary
- Quiz
- Chapter 16: Using Lookup Tables to Match Data
- Chapter 17: Formatting Data
- Chapter 18: Modifying SAS Data Sets and Tracking Changes
- Overview
- Using the MODIFY Statement
- Modifying All Observations in a SAS Data Set
- Modifying Observations Using a Transaction Data Set
- Modifying Observations Located by an Index
- Controlling the Update Process
- Understanding Integrity Constraints
- Placing Integrity Constraints on a Data Set
- Documenting Integrity Constraints
- Removing Integrity Constraints
- Understanding Audit Trails
- Initiating and Reading Audit Trails
- Controlling Data in the Audit Trail
- Controlling the Audit Trail
- Understanding Generation Data Sets
- Initiating Generation Data Sets
- Processing Generation Data Sets
- Summary
- Quiz
- Chapter 19: Introduction to Efficient SAS Programming
- Chapter 19: Introduction to Efficient SAS Programming
- Chapter 20: Controlling Memory Usage
- Chapter 21: Controlling Data Storage Space
- Chapter 22: Using Best Practices
- Chapter 23: Querying Data Efficiently
- Overview
- Using an Index for Efficient WHERE Processing
- Identifying Available Indexes
- Identifying Conditions That Can Be Optimized
- Estimating the Number of Observations
- Comparing Probable Resource Usage
- Deciding Whether to Create an Index
- Comparing Procedures That Produce Detail Reports
- Comparing Tools for Summarizing Data
- Summary
- Quiz
- Chapter 24: Creating Functions with PROC FCMP
- Appendix 1: Quiz Answer Keys
- Appendix 1: Quiz Answer Keys
- Chapter 1: Performing Queries Using PROC SQL
- Chapter 2: Performing Advanced Queries Using PROC SQL
- Chapter 3: Combining Tables Horizontally Using PROC SQL
- Chapter 4: Combining Tables Vertically Using PROC SQL
- Chapter 5: Creating and Managing Tables Using PROC SQL
- Chapter 6: Creating and Managing Indexes Using PROC SQL
- Chapter 7: Creating and Managing Views Using PROC SQL
- Chapter 8: Managing Processing Using PROC SQL
- Chapter 9: Introducing Macro Variables
- Chapter 10: Processing Macro Variables at Execution Time
- Chapter 11: Creating and Using Macro Programs
- Chapter 12: Storing Macro Programs
- Chapter 13: Creating Indexes
- Chapter 14: Combining Data Vertically
- Chapter 15: Combining Data Horizontally
- Chapter 16: Using Lookup Tables to Match Data
- Chapter 17: Formatting Data
- Chapter 18: Modifying SAS Data Sets and Tracking Changes
- Chapter 19: Introduction to Efficient SAS Programming
- Chapter 20: Controlling Memory Usage
- Chapter 21: Controlling Data Storage Space
- Chapter 22: Using Best Practices
- Chapter 23: Querying Data Efficiently
- Chapter 24: Creating Functions with PROC FCMP
- Appendix 1: Quiz Answer Keys
- Index
- Additional Resources
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