Eliminating Duplicate Rows

Aug 9, 2000

Hi,

I have a table with four columns. like id,lastname,
firstname,acctname. I have duplicate values for the three columns other
than id column. like

ID FirstNameLastname Acctname
1 john hopkins jh
2 john hopkins Jh
3 david webb dw
4 david webb dw
5 david webb dw
6 Dan Kennedy DK

I want to eliminate the duplicate rows. id can be any one of them.
Can any one suggest me with a query by which i can do this.
Thanks in advance
Mohan

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ELIMINATING DUPLICATE ROWS URGENT

Jul 20, 2007

Hi i have a table value which contains
value
-----
a
a
a
b
b
b
c
c
c

Now i need to have the results as

a 1

b 1

c 1


I tried using distinct.But OLEDB returns error that invalid syntax.It doesn't support distinct keyword.Actually i read these table from a file thru OLEDB.Not from a database.Any idea ? Thanks in Advance

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Eliminating Duplicate Records

May 13, 2008

Hey There.

I'm in the process of doing a major data clean up and I'm just wondering how I would go about eliminating some redundant data.

The Table Layout

Contracts

CNTRID CONTRACTNUM STARTDATE CUSTOMNUM
=======================================================
0 1234567 091885 A
1 1234567 091885 A
2 1111111 111111 B
3 1234567 081205 A


Equipment

EQUIPID DEVICENAME CNTRID CUSTOMNUM
=======================================================
0 DEVICE1 0 A
1 DEVICE2 2 B
2 DEVICE3 1 A
3 DEVICE4 3 A


You will notice that each customer may have multiple devices. Each device may be tied to a contract, and each contract may have one or more devices tied to it.

In the example above, you will notice in the contracts table the contracts with the IDs 0 and 1.

Fig 1.

CNTRID CONTRACTNUM STARTDATE CUSTOMNUM
=======================================================
0 1234567 091885 A
1 1234567 091885 A


These contracts have the exact same information.

Furthermore, if you look down the table you will notice the contract with the ID 3.

Fig 2.

CNTRID CONTRACTNUM STARTDATE CUSTOMNUM
=======================================================
3 1234567 081205 A

This contract shares the same contract and customer number, but has a different start date.


Now lets take a look devices in the equipment table that refer to these records.

EQUIPID DEVICENAME CNTRID CUSTOMNUM
=======================================================
0 DEVICE1 0 A
2 DEVICE3 1 A
3 DEVICE4 3 A

You will notice that DEVICE1 and DEVICE 3 refer to the contract records that contain identical data. (As shown in 'Fig 1')

My question is as follows:

How do I eliminate the any duplicate records from the contracts table, and update the records in the equipment table with id of the left over contract.

Results Should be as follows:

Contracts

CNTRID CONTRACTNUM STARTDATE CUSTOMNUM
=======================================================
0 1234567 091885 A
2 1111111 111111 B
3 1234567 081205 A


Equipment

EQUIPID DEVICENAME CNTRID CUSTOMNUM
=======================================================
0 DEVICE1 0 A
1 DEVICE2 2 B
2 DEVICE3 0 A
3 DEVICE4 3 A


Any help you may provide would be greatly appreciated!

Thanks
--mike

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Feb 11, 2007

I am new to sql server and I am having deficulties writing sql script to perform the following:
1) Merging data from two tables A and B
2) Eliminate duplicate present in table B (Conditions to satisfy for dublicate:If similar address is found in both tables AND class type in Table A =1
3) merge data related to dup(eliminated records) to new table.
Not sure if we can eliminate records first before merging two tables. Tables are as follow:

Table A
Fields: ID, NAME, Address, city, zip, Class type
Value:123, John, 123 Main, NY, 71690,1
Value:124, Tom, 100 State, LA, 91070,0


Table B
Field: ID, NAME, Address, city, zip, Class Type
Value:200, Tim, 123 Main, NY, 71690,0 (duplicate; satisfied both conditions and left out in final table)
Value:124, Jack, 100 State, LA, 91070,0 (same condition but second condition is not met)
Value:320,Bob, 344 coast hwy, slc, 807760,0


Final Table:
Field: ID, NAME, Address, city, zip, Class Type
Value:123, John, 123 Main, NY, 71690,1 (should also show t
Value:124, Tom, 100 State, LA, 91070,0
Value:124, Jack, 100 State, LA, 91070,0
Value:320,Bob, 344 coast hwy, slc, 807760,0

Table d:(relate to table A:showing all products that are related to table A)
table_A.ID, Products
123, Paper 1
123, paper 2

Table e:(relate to table B: showing all products that are related to table B)
table_B.ID, Products
200, Paper 3

Final Table:
ID, Product
123, Paper 1
123, Paper 2
123, Paper 3 (changing table b id to table a)

Would appreciate any help writing script to perform such transformation. Thanks

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Jul 13, 2007

Hello,

I'm trying to eliminate the duplicate 'URL' rows in the query:


SELECT
ni.[Id],
ni.[Abstract],
ni.[MostPopular],
ni.[URL]
FROM dbo.[NewsCategory] nc WITH (READUNCOMMITTED)
INNER JOIN dbo.[NewsItem] ni WITH (READUNCOMMITTED)
ON nc.[Id] = ni.NewsCategoryId
WHERE
--nc.[ProviderId] = @ProviderId
--AND
ni.[URL] in (
select DISTINCT URL
from dbo.NewsItem
where mostpopular = 1
-- OR mostemailed = 1
)
ORDER BY ni.[DateStamp] DESC



If you look at this line in the query :

select DISTINCT URL
from dbo.NewsItem
where mostpopular = 1


IF i run this query alone it will return 8 unique rows. I expect that the SELECT IN statemnet would help return a distinct set but it doesn't. This entire query returns like 20 rows with duplicate rows.

The reason why I can't do a distinct in the first set of columns is because the column ni.[Abstract] is TEXT and it says that data type is NOT COMPARABLE.

Thanks so much.

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Nov 28, 2007

Dear Gurus,I have table with following entriesTable name = CustomerName Weight------------ -----------Sanjeev 85Sanjeev 75Rajeev 80Rajeev 45Sandy 35Sandy 30Harry 15Harry 45I need a output as followName Weight------------ -----------Sanjeev 85Rajeev 80Sandy 30Harry 45ORName Weight------------ -----------Sanjeev 75Rajeev 45Sandy 35Harry 15i.e. only distinct Name should display with only one value of Weight.I tried with 'group by' on Name column but it shows me all rows.Could anyone help me for above.Thanking in Advance.RegardsSanjeevJoin Bytes!

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Jun 25, 2001

I used the following select statement to get duplicate records on Case_number column

select cases.distinct case_link, cases.case_number
from cases
group by case_link
having case_number > 1

I got the error message that

"'cases.warrant_number' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
AND
cases.case_number' is invalid in the HAVING clause because it is not contained in either an aggregate function or the GROUP BY clause.


Any idea on a better statement to use. THANKS FOR YOUR HELP!

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Jun 29, 2001

Hi,
I have a table and this is what i did to get the desired result

Select A.col1,count(A.col1)
from Tab1
group by col1
having count(A.Col1) > 1

i tried this - but it didnot worked - it returned col1 as blanks -
Select A.col1,B.Col2,count(A.col1)
from Tab1 A, Tab2 B
where A.col1 = B.col1
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As I was looking for all the rows that are apperaing more than once.

Now - The problem -

I have to join this table to another table Tab2 to get the other details.
My Tab2 is a table from where I have to pull the Customer DEtails like name,address etc.
How should I write this query?
Any thinuhts?
TIA

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Jul 20, 2006

Hi,

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May 16, 2007

Hi. I'm a SQL Server newbie, very experienced with Access, developing an ASP.NET database editor web app. I query the database with a statement more or less in the following form:

SELECT organisation.OrgID, organisation.Name, organisation.whatever FROM services INNER JOIN servicegrouping ON services.serviceID=servicegrouping.serviceID INNER JOIN organisations ON servicegrouping.OrgID = organisations.OrgID WHERE services.service=x OR services.service=y

In other words, I have a database of organisations. The services offered by the organisations are in a separate table, and I only want to return organisations that offer services X or Y.

Okay, now if I did this in Access, this query would return just one record for each organisation that meets the condition, unless I was to include a field from the services table in the SELECT clause, in which case of course I would get one record for each organisation and unique service offered.

But in MS SQL, the query returns duplicate rows if there is more than service offered by the organisation that meets the WHERE condition (=x or =y). Why is this and what do I need to do to my SQL statement to ensure I only get unique rows?

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Feb 6, 2008

Hi,

I've a query which gets a set of data from multiple tables -

select *
FROM A
inner JOIN q
ON (RIGHT(q.name,CHARINDEX('-',REVERSE(q.name))-1)= a.id)
inner JOIN t
ON (t.id = q.id)
inner JOIN s
ON (q.name = s.name )
inner join l
on (s.name = l.name
and t.name = l.name)

WHERE A.id = 764
and s.name = '764'

I get repeated # of rows for each id. I've some 136 rows for each q.id ( there are 6 q.ids and hence I get 816 rows instead of 136) These 136 rows are actually divided among thse q.ids as

id=5, 4 rows
id=6, 8 rows
id=7, 24 rows
id=8, 40 rows
id=10, 60 rows
total=136 rows

Let me know what I'm missing here

Thanks for your help!
Subha

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Feb 1, 2008

Hello,
I have a question, what does a statement look like that finds the duplicate rows and combines them,
I have a table named PRODUCTS in it 3 columbs Cost, Stock, Part_number.
I need to find all Part_numbers that dublicate, Combine the rows into 1 & combine (sum, add) their stock together is the new row & take an avarerage of their cost and use it as cost in the new row where they combine.
Please help me, I am stalled. Looked all over the internet & could not find anything, I really need this for a project I can not finish.
I have the following SQL statement:
SELECT part_number,
COUNT(part_number) AS NumOccurrences
FROM Products
GROUP BY Part_number
HAVING COUNT(part_number) > 1
 

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May 6, 2008

I have a csv file that I need to import daily into a SQL Server 2005 table. Much of the table contents could just be overwritten with the new csv file, however there are a set of Rows within the table that need to be appended to , rather than overwritten. 
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I'm not sure this is the best approach, but what I have been trying to do, is append the entire csv file to the existing table, and then go back and delete the duplicates.
When I run the Delete, it does delete the majority of the records, but leaves a couple hundred behind. The number left behind varies with each run, can't seem to identify a pattern here. Running the Delete a second time does clean up the rows left behind in the first execution of the Delete, and gives the result I want.
Any thoughts as to why this needs to be run twice? Or is a better approach available?
Here is my code -
SELECT [Pkg ID], [Elm (s)], [Type Name (s)], [End Exec Date], [End Exec Time], dupcount=count(*)
INTO temppkgactions
FROM pkgactions
GROUP BY [Pkg ID], [Elm (s)], [Type Name (s)], [End Exec Date], [End Exec Time]HAVING count(*) > 1
 
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FROM dbo.pkgactions
DROP TABLE temppkgactions
 
Thanks
 
 

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Apr 6, 2001

hi,

I want to delete duplicate rows in a table, can any one write a sql for doing that...

please help me in this...

urs
Vj

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A B C A X ......
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A B C C Z ......
A B C A Y ......
. . . . . ......

I want to delete all the rows except one row. Anybody can help?

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Hi,
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Feb 11, 1999

Hai

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Hello,

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docs int
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......

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docs field1
1 hello
2 hello
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4 test
5 problem
6 problem

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thanks

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This is an imaginary problem while discussing ROWID in ORACLE.

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gunvantp@yahoo.com

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Code:

SELECT * FROM Map
INNER JOIN ThreatCategory
INNER JOIN Threat ON
ThreatCategory.threatCategoryID = Threat.threatCategoryID
INNER JOIN Threat_Map
ON Threat.threatID = Threat_Map.threatID
ON Map.mapID = Threat_Map.mapID
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Hi,
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Dec 3, 2005

Hi,

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create table test(col1 int, col2 text)
go
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go
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go
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Code:
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Hi,

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------------------

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Model 2
Model 2
Model 4


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