Removing Old Records While Retaining Recent Ones

Apr 12, 2006

Hey guys, I have a table full of data that has duplicate records except for two date columns (date1 and date2). What I would like to do is remove the duplicates while retaining the most recent record, how can I do this?

So record 1 looks like this:


Code:

John | Smith | 08/08/2000 | 10/10/2000



Record 2 looks like this:


Code:

John | Smith | 08/10/2005 | 10/10/2005



I'd like to remove the first instance and keep the second (most recent one).

Ideas?

Thanks!

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Retaining Records Of Top N Rows And Deleting The Rest

May 15, 2008

Hi All,
I am writing a SP where I need to pass an value to maintain records of last n days. In this SP I am deleting a couple of tables based on the value passed to this SP. For e.g. If the SP is passed the value 10, then only TOP 10 records is maintained, the rest are deleted.
I have formed the following logic, which I feel can be improved vastly.
I create a temp table and

CREATE TABLE #TempAuditTbl (Rownum int PRIMARY KEY, Orderid uniqueidentifier)

INSERT INTO #TempAuditTbl

SELECT ROW_NUMBER() OVER (ORDER BY orderdate desc) AS rownum, Orderid FROM Orders

DELETE Orders FROM Orders INNER JOIN #TempAuditTbl adt ON adt.Orderid = Orders.Orderid AND rownum > @TopnRows

DROP TABLE #TempAuditTbl


OR


DELETE FROM Orders WHERE orderid NOT IN ( SELECT TOP @TopnRows OrderID FROM Orders ORDER BY OrderDate desc)

This way I am able to keep the top n records.
Which of these two solutions is more efficient? Is there a more efficient way to achieve the same.
Please help.

Thanks & regards
Sunil

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Sep 28, 2007

I have tested the code below to remove duplicate table entries based on the field IntOOS. This code works; however, I want to ensure I am removing the oldest entries and keeping the most recent entry. The field to key on this would be something like Max(ID). What would be the best way to ensure I keep the most recent table entry?


/*** Removes duplicate rows from ampfm.rpt_AdtVisitDiag table

by Chuck King 20070928

***/

;WITH CTE

as

(

SELECT

ROW_NUMBER() OVER (Partition By IntOOS Order BY IntOOS) AS ROWID

,DischDate

,AdmDiagCode

,ID

,AdmDiagCodeDesc

,AdmittingDiagnosis

,AnyDx

,DischDx

,ECode

,IntOOS

,PrinDxAnesDesc

,PrinDxAnesInd

,PrinDxCode

,PrinDxCondDesc

,PrinDxCondInd

,PrinDxDesc

,PrinDxEqualsAdmDxYnu

,SecDx10AnesDesc

,SecDx10AnesInd

,SecDx10Code

,SecDx10CondDesc

,SecDx10CondInd

,SecDx10Description

,SecDx11AnesDesc

,SecDx11AnesInd

,SecDx11Code

,SecDx11CondDesc

,SecDx11CondInd

,SecDx11Description

,SecDx12AnesDesc

,SecDx12AnesInd

,SecDx12Code

,SecDx12CondDesc

,SecDx12CondInd

,SecDx12Description

,SecDx13AnesDesc

,SecDx13AnesInd

,SecDx13Code

,SecDx13CondDesc

,SecDx13CondInd

,SecDx13Description

,SecDx14AnesDesc

,SecDx14AnesInd

,SecDx14Code

,SecDx14CondDesc

,SecDx14CondInd

,SecDx14Description

,SecDx15Code

,SecDx15Description

,SecDx1AnesDesc

,SecDx1AnesInd

,SecDx1Code

,SecDx1CondDesc

,SecDx1CondInd

,SecDx1Description

,SecDx2AnesDesc

,SecDx2AnesInd

,SecDx2Code

,SecDx2CondDesc

,SecDx2CondInd

,SecDx2Description

,SecDx3AnesDesc

,SecDx3AnesInd

,SecDx3Code

,SecDx3CondDesc

,SecDx3CondInd

,SecDx3Description

,SecDx4AnesDesc

,SecDx4AnesInd

,SecDx4Code

,SecDx4CondDesc

,SecDx4CondInd

,SecDx4Description

,SecDx5AnesDesc

,SecDx5AnesInd

,SecDx5Code

,SecDx5CondDesc

,SecDx5CondInd

,SecDx5Description

,SecDx6AnesDesc

,SecDx6AnesInd

,SecDx6Code

,SecDx6CondDesc

,SecDx6CondInd

,SecDx6Description

,SecDx7AnesDesc

,SecDx7AnesInd

,SecDx7Code

,SecDx7CondDesc

,SecDx7CondInd

,SecDx7Description

,SecDx8AnesDesc

,SecDx8AnesInd

,SecDx8Code

,SecDx8CondDesc

,SecDx8CondInd

,SecDx8Description

,SecDx9AnesDesc

,SecDx9AnesInd

,SecDx9Code

,SecDx9CondDesc

,SecDx9CondInd

,SecDx9Description

,VisitTypeCode

,accountnumber

,DischVisitTypeCode

FROM ampfm.rpt_AdtVisitDiag

)

--Select * From CTE

Delete From CTE Where ROWID > 1

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i have a datetime field in the post tables.
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Mar 11, 2008

Ok, I was able to find the most recent Effective date and it works well. The only problem I am having is with the CarrierName. See there are different Carriers with so then it makes us have Mult effective dates. I need to pull the most recent effective date with carrier. So, I though to max the pcsiNumber2, but that didn’t work. Do you have any other ideas? Let me know.


Select Distinct
--PCSNumber,
PCSINumber1,
max(PCSINumber2) as mostrecentPCS,
LastName,
FirstName,
State,
--InsuranceCarrier,
CarrierName,
MAX(CoverageEffectiveDate)as MostRecentEff,
MAX(TerminationDate) as MostRecentTerm,
AmtPerClaim,
Aggreg

FROM VW_Medical_Malpractice_Project

Where
State = 'PA'


Group By PCSINumber1, LastName,FirstName,State,CarrierName,AmtPerClaim,Aggreg

Order By PCSINumber1


Example


000043010003MUSSER WILLIAM American Professional Agency2002-06-01

000043010002MUSSERWILLIAM Columbia Casualty2000-02-20

000043010001MUSSERWILLIAMMCIC Vermont Inc.1998-07-01

000043010004MUSSERWILLIAMProMutual Insurance Co.2005-05-16

000043010005MUSSERWILLIAMTri-Century Insurance Company2007-01-01


So, what I need is the most recent effective date which would be 2007-01-01, which I have but what is not letting me do this is the names, the 5ith column. I was trying to use the 2nd column to use the max , but it is not working. What am I doing wrong. I need the whole last row, but that number 0005 can change because there may only be 2 dup records.

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If I just do a select max(EventDate) and put EventTypes.Code='cancel' in the where clause it picks up records where the customer has done other things since the cancel.

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Jul 12, 2006

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---- ---- ------
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12/13/2007 shirt black
12/15/2007 shirt blue

result(s) expected:

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The database consists of the following tables:

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)
create table dbo.purchase_order (
purchase_order_id int identity primary key clustered
customer_id int not null,
amount money not null,
order_date date not null
)

Implement a query for the report that will provide the following information: for each customer output at most 5 different dates which contain abnormally high or low amounts (bigger or less than 3 times SDTDEV from AVG), for each of these dates output minimum and maximum amounts as well.

Possible result: [URL] ......

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Dec 2, 2005

Hi,

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Dec 5, 2007

Dear All

This is query i have written is giving following output.

FormCodeRefCodeSerialnoDateTime
R1-196H1-68A12232138/6/2007 19:38:11
R1-196H1-68A12232138/6/2007 19:38:14
R1-205H1-67XS23124148/6/2007 19:36:08
R1-205H1-67XS23124148/6/2007 19:36:10
R1-220H1-66F433365348/6/2007 19:30:27
R1-220H1-66F433365348/6/2007 19:30:29
R1-400H1-64ER53436648/6/2007 19:24:23
R1-400H1-64ER53436648/6/2007 19:24:26
R1-408H1-65TE4626268/6/2007 19:24:23
R1-408H1-65TE4626268/6/2007 19:25:00


I want the output like this,it should take only Min Datecreated
FormCodeRefCodeSerialnoDateTime
R1-196H1-68A12232138/6/2007 19:38:14
R1-205H1-67XS23124148/6/2007 19:36:08
R1-220H1-66F433365348/6/2007 19:30:27
R1-400H1-64ER53436648/6/2007 19:24:23
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This is the query I'm using to insert the data sent to me.

INSERT INTO ORDER_EVENTS
SELECT d.division as division,
dt.orderNum as orderNum,
dt.poNum as poNum,
dt.statusCode as statusCode,
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FROM dt_Order_Events dt INNER JOIN
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ABC

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556868 1999-01-01 1999-06-30
556868 1999-07-01 1999-10-31
556869 2002-10-01 2004-01-31
556872 1999-02-01 2000-08-31
556872 2000-11-01 2004-01-31
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Code:


Table: Reports_AccountID
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--------------------------
5 | 1234
5 | 987
4 | 1234
3 | 1234
5 | 5677

Log: Reports_Log
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----------------------------------------
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9875 | 5 | 987 | 9/4/2007 10:35:43 AM
9874 | 4 | 1234 | 9/4/2007 9:05:43 AM
9873 | 3 | 1234 | 9/4/2007 9:30:17 AM
9872 | 5 | 1234 | 9/3/2007 10:35:43 AM
9871 | 5 | 987 | 9/3/2007 10:35:43 AM
9870 | 4 | 1234 | 9/3/2007 9:05:43 AM
9869 | 3 | 1234 | 9/3/2007 9:30:17 AM
9868 | 5 | 1234 | 9/2/2007 10:35:43 AM
9867 | 5 | 987 | 9/2/2007 10:35:43 AM
9866 | 5 | 5677 | 9/2/2007 10:35:43 AM
9865 | 4 | 1234 | 9/2/2007 9:05:43 AM
9864 | 3 | 1234 | 9/2/2007 9:30:17 AM



so if i wanted to know what report for reportID 5 hasn't run in the past 2 days, it would be accountID of 5677 (last ran on 9/2/2007 10:35:43 AM)

I am not sure where to even start. I am thinking I can grab the latest report ran for all Accounts in the Reports_AccountID table (create temp table and insert most recent log record into that table), and do a date difference between the date and current datetime and select based on datedifference > 2 ?

or would the best way is to do an inner join between the 2 tables for all reports ran in the past 2 days, and then whatever account is not listed in that query, is a report that has not run (do a subquery?)

just trying to think of the best way to do this. any tips/advice would be appreciated

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