How To Count Duplicated Values in a Column? in SQL Server

Q

How To Count Duplicated Values in a Column in SQL Server?

✍: FYIcenter.com

A

If you have a column with duplicated values, and you want to know what are those duplicated values are and how many duplicates are there for each of those values, you can use the "GROUP BY ... HAVING" clause as shown in the following example. It returns how many duplicated first names in the fyi_team table:

SELECT first_name, COUNT(*) FROM fyi_team 
   GROUP BY first_name HAVING COUNT(*) > 1
GO
first_name   count(*)
John         5

So we have "John" as duplicated first name 5 times in the fyi_team table.

⇒ Using Multiple Columns in the GROUP BY Clause in SQL Server

⇐ HAVING - Apply Filtering Criteria at Group Level in SQL Server

⇑ Using SELECT Statements and GROUP BY Clauses in SQL Server

⇑⇑ SQL Server Database Tutorials

2016-10-25, 4090🔥, 0💬