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Transact SQL Tutorial: Design Pattern for Finding Duplicate Data - A Simple Way to Spot Non-Unique Rows (Multi Column Test)

   Chapter: Design Patterns for Transact-SQL
Download! Skill Level: 300 (Intermediate)
Duration: 13:02
Size: 10.4MB
Versions/Editions Covered: SQL Server 2005 , SQL Server 2008 , SQL Server 2000
Added/Updated: Apr 18, 2006
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We have multiple SQL tutorials for writing queries to return duplicate data in a column or multiple columns. This video focuses on spotting dupes across multiple columns. Although primary keys prevent duplicate rows, having a Primary Key on "EmployeeId" does not prevent users from entering duplicate LastName/FirstName combinations. This video shows you how to use subqueries (both correlated and simple) along with EXISTS to locate non-unique rows.
Tags for this video: duplicate check  
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Scott Whigham Scott Whigham is the founder of LearnItFirst.com, one of the web's most extensive video training libraries focusing on technical training. Scott is also an experienced consultant, trainer, and author with more than a decade of hands-on experience working with SQL Server databases, writing and debugging applications using Visual Studio, and performance tuning. Scott designed the architecture (websites, class libraries, and database) for the LearnItFirst.com websites and, most re... (Scott Whigham's full bio can be found on the About the Author page)

   
 
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9/8/2008 9:01:17 AM