Making duplicates unique

Question

Making duplicates unique

bcronce

SSCrazy

Points: 2597
More actions
June 26, 2008 at 7:45 am

#193737

I'm doing this right now to convert duplicate rows
Create Table #Dups
(
vchSectionNumber VARCHAR(50),
vchCourseID VARCHAR(50),
vchSchoolPeriodID VARCHAR(50),
vchsisclassid VARCHAR(50)
)
--This finds duplicate Section Numbers, then appends an incremental number to make them unique
INSERT #Dups (vchSectionNumber, vchCourseID, vchSchoolPeriodID, vchSISClassID)
SELECT c1.vchSectionNumber + ': ' + convert(varchar, ROW_NUMBER() OVER(ORDER BY c1.vchSectionNumber)), c1.vchCourseID, c1.vchSchoolPeriodID, c1.vchSISClassID
from Table c1
INNER JOIN
(SELECT vchSectionNumber, vchCourseID, vchSchoolPeriodID
FROM Table c
WHERE c.iConversionRun = @iConversionRun
GROUP BY vchSectionNumber, vchCourseID, vchSchoolPeriodID
HAVING count(vchsisclassid) > 1) c2 on c1.vchSectionNumber = c2.vchSectionNumber
and c1.vchCourseID = c2.vchCourseID
and c1.vchSchoolPeriodID = c2.vchSchoolPeriodID
UPDATE Table
SET Table.vchSectionNumber = c1.vchSectionNumber
FROM #Dups c1
WHERE Table.vchCourseID = c1.vchCourseID AND Table.vchSchoolPeriodID = c1.vchSchoolPeriodID AND Table.vchsisclassid = c1.vchsisclassid
DROP TABLE #Dups
That is converting
LastName, FirstName
LastName, FirstName
LastName, FirstName
into
LastName, FirstName: 7106
LastName, FirstName: 7107
LastName, FirstName: 7108
Is there a way to make it reset the increment per "LastName, FirstName" combination?
So I would get
LastName, FirstName: 1
LastName, FirstName: 2
LastName, FirstName: 3
DiffLastName, DiffFirstName: 1
Also, is there a way of doing this in SQL 2000 if I would need to?
Thanks!

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GSquared SSC Guru Points: 260824 More actions · Answer 1

In 2005, take a look at Row_Number in Books Online. It's very simple and easy to use.

For 2000, take a look at Jeff Moden's Running Totals article on this site. You should be able to use a variation on that. Bit more complex than Row_Number, but it can do what you want.

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Jeff Moden SSC Guru Points: 1003870 More actions · Answer 2

GSquared (6/26/2008)
For 2000, take a look at Jeff Moden's Running Totals article on this site. You should be able to use a variation on that. Bit more complex than Row_Number, but it can do what you want.

Thanks for the plug, Gus...

The article is at the following URL...

http://www.sqlservercentral.com/articles/Advanced+Querying/61716/

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

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