Sql query for avoiding repeatative data from data base

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SQL-Server-2008

Hi friends,
In my database unfortunately doubled one field.
Eg: In database ,I want original one data like "Enquiryid=123 and Coursename=nnn"
But now in my database every data is doubled;
Eg: "Enquiryid=123 and Courcename=nnn"
"Enquiryid=123 and Courcename=nnn"
I want to delete repeated 'enquiry_id'from my database but there should remaine original of the repeated 'enquiry_id' and its corresponding rows.......
do u get me????????then give me the sql query for this problem

Posted 21-Sep-11 1:22am

Nimisha Mary John

Updated 21-Sep-11 1:24am

v3

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kishorekke · Answer 1 · 2011-09-21T01:46:00

Hi.. Try below

To retain (eleminate) duplicate:

SELECT Enquiryid,Coursename,ROW_NUMBER() OVER(ORDER BY SlNo ) AS 'Row Number',*
FROM employee
GROUP BY Enquiryid,Coursename
Having Count(*)>1

To Delete duplicate:

;with TBLCTE(Enquiryid,Coursename)
AS
(
select
Enquiryid,Coursename,
Ranking = DENSE_RANK() over (PARTITION BY Enquiryid,Coursename order by newID())
from Employee
)
delete from TBLCTE where Ranking > 1

select * from Employee

Toniyo Jackson · Answer 2 · 2011-09-21T01:58:00

Solution 4

Try this.

SQL

DELETE TOP(1) FROM tablename WHERE Enquiryid = 123 AND Coursename = 'nnn'"

Posted 21-Sep-11 1:58am

Toniyo Jackson

Mehdi Gholam · Answer 3 · 2011-09-21T01:26:00

Solution 1

Look at the following link MSDN : How to remove duplicate rows from a table in SQL Server

Posted 21-Sep-11 1:26am

Mehdi Gholam