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UNION Queries - What They Are and How to Use Them (SQL Server 2000) - Training Video
   Category: JOINs and UNIONs - Working with Multiple Tables
Download! Skill Level: 200 (Beginner - Intermediate)
Duration: 7:43
Size: 4.6MB
Versions/Editions Covered: SQL Server 2000
Added/Updated: Apr 18, 2006

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Although less popular than JOINs, UNIONs are another way to work with multiple tables in the same query. Much of the time UNIONs are used to generate lists of things; i.e., "Find all Customers and Suppliers in the United States". This video gives you the basic syntax and, more importantly, the logic behind how it works and when to use UNION vs. UNION ALL.

Note: This video was shot on SQL Server 2000's Query Analyzer but the same logic applies for SQL Server 2005

Highlights from this video:

  • Difference between UNION and UNION ALL
  • Performance with UNION
  • Including indicators in result sets to identify which table a row comes from
  • Writing UNION compatible queries
  • Datatype mismatches in UNIONs and how to avoid them
  • ORDER BY in UNION queries
Tags for this video: distinct union all  
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About the Instructor:
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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