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COUNT of DISTINCT Rows in SQL Server

, 26 Nov 2010
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COUNT of DISTINCT Rows in SQL Server
SQL Server does not support COUNT(DISTINCT *). For example, the below query fails.
 
SELECT COUNT(DISTINCT *) FROM Employees
 
The error message generated is:
 
Incorrect syntax near '*'
 
Instead, use the below query:
 
SELECT COUNT(*) FROM (SELECT DISTINCT * FROM Employees) Emp
 
Note: This is specifically useful when you want 'DISTINCT *' - without coloumn name(s)

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

mravikiran

India India
Ravikiran Malladi is a senior software professional in Microsoft technologies. He has global IT experience of over 10 years and has compulsive habit of writing tools, particularly for the projects he works on. He has vast experience in the roles of senior developer, technical analyst, technical architect besides in technical lead roles.
 
His hobbies include chess, music, cricket, web sites along side writing technical articles and technical blogs.

Comments and Discussions

 
GeneralReason for my vote of 5 It works for DISTINCT but also work ... PinmemberSimon Dufour1-Dec-10 3:17 

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