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SQL Server FAQ - UNION - Merging Outputs from Two Queries Together

By: FYIcenter.com

(Continued from previous topic...)

How To Use UNION to Merge Outputs from Two Queries Together?

If you have two queries that returns the same row fields, you can merge their outputs together with the UNION operator. The following tutorial exercise shows you how to use the UNION operator:

SELECT * FROM fyi_links WHERE tag = 'DBA'
GO
id   url                notes  counts  created     tag
102  dba.fyicenter.com  NULL   972     2007-05-19  DBA
104  www.mysql.com             390     2006-01-01  DBA
105  www.oracle.com            960     2005-01-01  DBA

SELECT * FROM fyi_links WHERE tag = 'DEV'
GO
id   url                notes  counts  created     tag
101  dev.fyicenter.com  NULL   120     2006-04-30  DEV
106  www.php.net               439     2004-01-01  DEV

SELECT * FROM fyi_links WHERE tag = 'DBA'
UNION
SELECT * FROM fyi_links WHERE tag = 'DEV'
GO
id   url                notes  counts  created     tag
102  dba.fyicenter.com  NULL   972     2007-05-19  DBA
104  www.mysql.com             390     2006-01-01  DBA
105  www.oracle.com            960     2005-01-01  DBA
101  dev.fyicenter.com  NULL   120     2006-04-30  DEV
106  www.php.net               439     2004-01-01  DEV

(Continued on next topic...)

  1. How To Join Two Tables in a Single Query?
  2. How To Write a Query with an Inner Join?
  3. How To Define and Use Table Alias Names?
  4. How To Write a Query with a Left Outer Join?
  5. How To Write a Query with a Right Outer Join?
  6. How To Write a Query with a Full Outer Join?
  7. How To Write an Inner Join with the WHERE Clause?
  8. How To Name Query Output Columns?
  9. What Is a Subquery in a SELECT Query Statement?
  10. How To Use Subqueries with the IN Operators?
  11. How To Use Subqueries with the EXISTS Operators?
  12. How To Use Subqueries in the FROM Clause?
  13. How To Count Groups Returned with the GROUP BY Clause?
  14. How To Return the Top 5 Rows from a SELECT Query?
  15. How To Return the Second 5 Rows?
  16. How To Use UNION to Merge Outputs from Two Queries Together?
  17. How To Use ORDER BY with UNION Operators

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