How type find duplicate value in SQL server table ?

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i can not find duplicate value in a table

What I have tried:

SELECT (StudentFName+' '+StudentMName+' '+StudentLName)as Name,FatherName,CONVERT(varchar(20),DOB,103)AS DOB,COUNT(*) TotalCount
FROM tblStudentAdmission_basic
GROUP BY StudentFName,StudentMName,StudentLName,FatherName,DOB
HAVING COUNT(*) < 1
ORDER BY COUNT(*) DESC

Posted 7-Nov-16 19:33pm

Ubais Khan

Updated 7-Nov-16 19:46pm

v2

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Animesh Datta 8-Nov-16 1:40am

if duplicate value exists then count(*)> 1 not count(*)<1

Ubais Khan 8-Nov-16 2:03am

thanks

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jgakenhe · Accepted Answer · 2016-11-07T19:46:00

The first problem I see is you are counting less than 1; duplicates mean greater than 1.

Secondly, since this is homework, I'll only point you in the right direction. The query below is based off of yours and checks for duplicate names.

C#

SELECT (StudentFName + ' ' + StudentMName + ' ' + StudentLName) AS Name, 
	COUNT((StudentFName + ' ' + StudentMName + ' ' + StudentLName)) AS NumberOfNames
FROM tblStudentAdmission_basic
GROUP BY StudentFName, StudentMName, StudentLName
HAVING (COUNT((StudentFName + ' ' + StudentMName + ' ' + StudentLName)) > 1)