Deleting Dups

Jul 3, 2002

I need to delete duplicate records from a SQL table where only the key field is not a duplicate. I'm not having any luck with my script. Does anyone have a scrip that might work? Thanks

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Deleting Dups And Keeping Only 1 Row In A Batch

Sep 20, 2006

I have asked this question before and got some great answers, I just wanted to ask this again. I can detect dups easily, is there a way to get a total number of all dups so that I can delete a certain number at a time, then check the total again for verification that that specific number of dups are gone? I'm still using 2000. If I delete dups, won't it delete the 1 row I want to keep? And I do have a unique identity column.

thx,

Kat

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Dealing With Dups And A Lot More!

Mar 14, 2008

Ok, I have a table with about 47000 records in it. I have the following query for that table:Select ReportType =
Case
When ReportType = 1 Then 'Uniquery Report'
When ReportType = 2 Then 'SABRE Report'
When ReportType = 3 Then 'Menu Report'
Else Null
End,
ReportNameTo_,
Frequency.Frequency as Frequency,
ReportDate,
ReportDescription
From Report
Inner Join Frequency on ( Report.ReportFrequency = Frequency.FID )
Where ( Active = 1 )
And ReportDate = ( Select Max ( ReportDate ) From Report Where ( Active = 1 ) )
And ReportID = ( Select Max ( ReportID ) From Report Where ( Active = 1 ) )
The idea is that i need to get only the last report based off of unique reportname. I added a computer column to the table to give me the ReportNameTo_, since my deliminator is the _. Now my issue is that I have 1 records showing (the last record added to the table), which is right for the query that is written, but wrong for what I want. I need to only return the last record for each unique ReportNameTo_. So as an example, my table has the following ID, ReportNameTo_, Date fields the data looks something like this:
1, 123_, 1/1/20082, 123_, 1/1/20083, 124_, 1/1/20084, 124_, 1/1/20085, 125_, 1/1/20086, 125_, 1/1/20087, 126_, 1/1/20088, 126_, 1/1/2008
I only want to return the following:
2, 123_, 1/1/20084, 124_, 1/1/20086, 125_, 1/1/20088, 126_, 1/1/2008
Hope someone out there can let me know how to do this... I am almost there, just not all the way.

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Select One Recort From Dups

Oct 27, 2003

Hi all,

I have a table with multiple rows for the same member. For example:

Member1:

Id First_name Last_name
11111 John Joe
11111 John Joe
11111 John Joe
11111 Linda smith

Member2

Id First_name Last_name
22222 Jackie Smith
22222 Jackie Smith
22222 John Smith
22222 Aron Smith

I need to eliminate dups and
my result table should have two rows only:

Id First_name Last_name

11111 John Joe
22222 Jackie Smith

How am I going to do this?? Any ideas...
please.

Thanks,

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Detect And Or Delete Dups

Oct 30, 2002

Hassle free locating / reporting or deletion of duplicate rows in a SQL table based on the uniqueness of a column or columns that the user provides with a few nifty hands off features. Keywords: delete unique column record records

(This code may also be viewed at http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=576&lngWId=5

/*Description: UTILITY - Locate in MASTER

Syntax: EXEC sp_RemoveDups TableName, DupQualifierFieldNameList, DeleteDups, UniqueColName, CreateIdentColIfNeeded, StoredProcedureResult
Only the first two arguments are required
For HELP, enter the stored procedures name without any arguments or see the PRINT statements below
NO DELETION WILL OCCUR by default - only duplicate recordset returned. To delete records, pass in a 0 for the DeleteDups argument.

Example: EXEC sp_RemoveDups 'MyTable','LastName,FirstName,HomePhone'

Purpose: Allow removal of duplicate rows where
1. We define what fields qualify the duplicate
2. We select the unique rowid or it is detected automatically else no action takes place

Method:Delete by RowID all duplicate rows except the highest RowID (in alpha-sort sequence)
of each group of duplicates.

DATEBYCHANGE
09-23-2002FrankOriginal v1.0
09-23-2002FrankChanged the name from sp_RemoveDupsByRowID to sp_RemoveDups
10-8-2002Sean P. O. MacCath-MoranMade @UniqueColName optional
Added logic to auto-detect RowGUID and Identity columns
Added logic to check for unique value column if no RowGUID or Identity column exists
Added logic to create a temporary ID field as a last resort if no unique column could be located
Added HELP

*/

CREATE PROCEDURE sp_RemoveDups
@TableName as varchar(50) = NULL,
@DupQualifierFieldNameList as varchar(200) = NULL,
@DeleteDups as bit = NULL,
@UniqueColName as varchar(50) = NULL,
@CreateIdentColIfNeeded as bit = NULL,
@StoredProcedureResult int = NULL OUTPUT

AS
SET NOCOUNT ON

DECLARE @SQL nvarchar(2000)
DECLARE @SQL_DetermineUniqueTemplate nvarchar(2000)
DECLARE @TempIdentColName varchar(20)
DECLARE @HostName varchar(50)
DECLARE @ActionText varchar(10)

DECLARE @SUM int
DECLARE @COUNT int
DECLARE @NextColumn varchar(50)

/*==================================================================================*/
/*========================VARIABLE INITIALIZATION AND SETUP========================*/
/*=================================================================================*/
/*If no unique column is located then a temporary Identity column will be created useing the name specified in this TempIdentColName string*/
SET @TempIdentColName = 'TempIdentityColXY123'

SET @SQL_DetermineUniqueTemplate = 'SELECT @COUNT = COUNT(Count), @SUM = sum(Count) from '
SET @SQL_DetermineUniqueTemplate = @SQL_DetermineUniqueTemplate + CHAR(13) + '(SELECT TOP 100 PERCENT <COLUMN_NAME>, COUNT(*) as Count FROM ' + @TableName
SET @SQL_DetermineUniqueTemplate = @SQL_DetermineUniqueTemplate + CHAR(13) + ' GROUP BY <COLUMN_NAME> ORDER BY <COLUMN_NAME>) a'

/*Retrieve the Host Name. This will be used later in this SP as a test to determine if the user is making this call from within SQL Query Analyzer*/
SELECT @HostName = hostname FROM master..sysprocesses WHERE spid = @@SPID AND program_name = 'SQL Query Analyzer'

/*Set ActionText to be used in message output*/
IF (@DeleteDups IS NULL) OR (@DeleteDups = 1)
SET @ActionText = 'Selection'
ELSE
SET @ActionText = 'Deletion'

/*If a value is specified for use by UniqueColName it cannot exist in the columns from the DupQualifierFieldNameList*/
IF CHARINDEX(@UniqueColName, @DupQualifierFieldNameList) > 0
BEGIN
/*The value in UniqueColName was detected in DupQualifierFieldNameList.*/
IF NOT (@HostName IS NULL) PRINT 'The UniqueColName provided (' + @UniqueColName + ') must not exist in DupQualifierFieldNameList (' + @DupQualifierFieldNameList + '). Other solutions will be sought automatically.'
SET @UniqueColName = NULL
END

/*If UniqueColName is provided then perform check to ensure that all the values in that column are, in fact, unique.*/
IF NOT (@UniqueColName IS NULL)
BEGIN
SET @SQL = REPLACE(@SQL_DetermineUniqueTemplate,'<COLUMN_NAME>', @UniqueColName)
/*Perform a check of this column to determine if all of it's values are unique*/
EXEC sp_executesql @SQL, N'@SUM as int OUTPUT,@COUNT as int OUTPUT',@SUM OUTPUT,@COUNT OUTPUT
/*Test to determine if this column contains unique values*/
If @SUM <> @COUNT
BEGIN
/*The column specified by UniqueColName does not contain unique values.*/
IF NOT (@HostName IS NULL) PRINT 'The UniqueColName provided (' + @UniqueColName + ') does not contain unique values. Other solutions will be sought automatically.'
SET @UniqueColName = NULL
END
END

/*==============================================================*/
/*======================HELP OUTPUT TEXT======================*/
/*==============================================================*/
IF (@TableName IS NULL) OR (@TableName = '/?') OR (@TableName = '?') OR (@DupQualifierFieldNameList IS NULL) OR (@DupQualifierFieldNameList = '/?') OR (@DupQualifierFieldNameList = '?')
BEGIN
IF NOT (@HostName IS NULL)
BEGIN
PRINT 'sp_RemoveDups ''TableName'', ''DupQualifierFieldNameList'', [''DeleteDups''], [''UniqueColName''], [''CreateIdentColIfNeeded''], <''StoredProcedureResult''>'
PRINT '====================================================================================================================================================================='
PRINT 'TableName: Required - String - Name of the table to detect duplicate records in.'
PRINT 'DupQualifierFieldNameList: Required - String - Comma seperated list of columns that make up the unique record within TableName.'
PRINT 'DeleteDups: Optional - Bit, Set to 0 to delete duplicate records. A value of NULL or 1 will return the duplicate records to be deleted.'
PRINT 'UniqueColName: Optional - Bit - A table must have a unique column value in it to perform the deletion logic. If no UniqueColName is provided then an attemp will be made to locate the RowGUID column. If that fails then an attempt will be made to locate the Identity column. If that fails then all of the columns of the table will be examined and the first one with all unique values will be selected.'
PRINT 'CreateIdentColIfNeeded: Optional - Bit - By default this SP will create an identity column if no unique column can be located. Pass in a 1 here to run this feature off.'
PRINT 'StoredProcedureResult: Optional - OUTPUT - Int - Returns a 3 if an error occured, otherwise returns a 0.'
END
SET @StoredProcedureResult = 3
RETURN
END

/*========================================================================*/
/*======================DETECT USABLE UniqueColName======================*/
/*========================================================================*/
IF @UniqueColName IS NULL
BEGIN
/*Check for a RowGUID or Identity column in this table. If one exists, then utilze it as the unique value for the purposes of this deletion*/
IF EXISTS(SELECT * FROM SysColumns WHERE ID = Object_ID(@TableName) and ColumnProperty(ID,Name,'IsRowGUIDCol') = 1) SET @UniqueColName = 'RowGUIDCol'
IF EXISTS(SELECT * FROM SysColumns WHERE ID = Object_ID(@TableName) and ColumnProperty(ID,Name,'IsIdentity') = 1) SET @UniqueColName = 'IdentityCol'

IF @UniqueColName IS NULL
/*If no RowGUID or Identity column was found then check all of the columns in this table to see if one of them can be utilized as a unique value column*/
BEGIN
/*Select all of the columns from the table in question...*/
DECLARE MyCursor CURSOR LOCAL SCROLL STATIC FOR SELECT name FROM syscolumns WHERE OBJECT_ID(@TableName)=ID

OPEN MyCursor
FETCH NEXT FROM MyCursor INTO @NextColumn
WHILE @@fetch_status = 0
BEGIN
/*Create SQL string with correct column name in place.*/
SET @SQL = REPLACE(@SQL_DetermineUniqueTemplate,'<COLUMN_NAME>', @NextColumn)
/*Perform a check of this column to determine if all of it's values are unique*/
EXEC sp_executesql @SQL, N'@SUM as int OUTPUT,@COUNT as int OUTPUT',@SUM OUTPUT,@COUNT OUTPUT
/*Test to determine if this column contains unique values*/
If @SUM = @COUNT
BEGIN
/*A unique values column is detected. Use it and break out of the loop UNLESS column is specified in DupQualifierFieldNameList*/
IF CHARINDEX(@NextColumn, @DupQualifierFieldNameList) = 0
BEGIN
/*NextColumn was NOT detected in DupQualifierFieldNameList, so this is the column we will use.*/
SET @UniqueColName = @NextColumn
BREAK
END
END
ELSE
FETCH NEXT FROM MyCursor INTO @NextColumn
END
CLOSE MyCursor
DEALLOCATE MyCursor

END
END

/*If no UniqueColName has been found then create one UNLESS @CreateIdentColIfNeeded = 1*/
IF (@UniqueColName IS NULL) AND ( (@CreateIdentColIfNeeded IS NULL) OR (@CreateIdentColIfNeeded = 0) )
BEGIN
/*Add a sequence column to the table...*/
IF NOT (@HostName IS NULL) PRINT 'Creating temporary identity column in the ' + @TableName + ' table named ' + @TempIdentColName + ' for use in this ' + LOWER(@ActionText) + ' process...'
EXEC('ALTER TABLE ' + @TableName + ' ADD ' + @TempIdentColName + ' [int] IDENTITY (1, 1)')
SET @UniqueColName = @TempIdentColName
END

/*============================================================================*/
/*======================EXECUTE DELETION OR SELECTION======================*/
/*===========================================================================*/
IF @UniqueColName IS NULL
BEGIN
/*No UniqueColName was provided by the user and none were detected by the script. This deletion algorythm cannot run.*/
IF NOT (@HostName IS NULL) PRINT 'Could not perform ' + LOWER(@ActionText) + ' process. No unique columns were located and the UniqueColName flag is set to 1 (False).'
SET @StoredProcedureResult = 3
RETURN
END
ELSE
BEGIN
IF NOT (@HostName IS NULL) PRINT 'Performing ' + LOWER(@ActionText) + ' utilizing the unique values in the ' + @UniqueColName + ' column as a reference...'
/*
Create and execute an SQL statement in the form of:

SELECT * (or DELETE)
FROM TableName WHERE UniqueColName IN
(
SELECT UniqueColName FROM TableName WHERE UniqueColName NOT IN
(
SELECT MAX(Cast(UniqueColName AS varchar(36))) FROM TableName GROUP BY DupQualifierFieldNameList, DupQualifierFieldNameList, etc
)
)
*/
/*Delete all duplicate records useing @UniqueColName as a unique ID column */
IF (@DeleteDups IS NULL) OR (@DeleteDups = 1)
SET @SQL = 'SELECT * '
ELSE
SET @SQL = 'DELETE '

SET @SQL = @SQL + 'FROM ' + @TableName + ' WHERE ' + @UniqueColName + ' IN '
SET @SQL = @SQL + CHAR(13) + CHAR(9) + '(' + CHAR(13) + CHAR(9)
SET @SQL = @SQL + 'SELECT ' + @UniqueColName + ' FROM ' + @TableName + ' WHERE ' + @UniqueColName + ' NOT IN '
SET @SQL = @SQL + CHAR(13) + CHAR(9) + CHAR(9) + '(' + CHAR(13) + CHAR(9)+CHAR(9)
SET @SQL = @SQL + 'SELECT MAX(Cast(' + @UniqueColName + ' AS varchar(36))) FROM '
SET @SQL = @SQL + @TableName + ' GROUP BY ' + @DupQualifierFieldNameList
SET @SQL = @SQL + CHAR(13) + CHAR(9) + CHAR(9) + ')' + CHAR(13) + CHAR(9) + ')'

EXEC (@SQL)
IF @@ERROR <> 0
BEGIN
IF NOT (@HostName IS NULL) PRINT @ActionText + ' process failed.'
SET @StoredProcedureResult = 3
END
ELSE
BEGIN
IF NOT (@HostName IS NULL) PRINT @ActionText + ' completed successfully with this SQL: ' + CHAR(13) + @SQL
SET @StoredProcedureResult = 0
END
END

IF (@UniqueColName = @TempIdentColName) AND ( (@CreateIdentColIfNeeded IS NULL) OR (@CreateIdentColIfNeeded = 0) )
BEGIN
/*Remove the sequence column from the table...*/
IF NOT (@HostName IS NULL) PRINT 'Removing temporary identity column named ' + @TempIdentColName + ' from the ' + @TableName + ' table...'
EXEC('ALTER TABLE ' + @TableName + ' DROP COLUMN ' + @TempIdentColName)
END
GO

Edited by - emanaton on 10/30/2002 11:28:34

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/****** Object: StoredProcedure [dbo].[dbo.ServiceLog] Script Date: 07/18/2014 14:30:59 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
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-- Purge records dbo.ServiceLog older than 3 months:
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[Code] ...

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Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Must declare the scalar variable "@UserId".Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:

[SqlException (0x80131904): Must declare the scalar variable "@UserId".]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +95
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +82
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System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +149
System.Web.UI.WebControls.SqlDataSourceView.ExecuteDbCommand(DbCommand command, DataSourceOperation operation) +492
System.Web.UI.WebControls.SqlDataSourceView.ExecuteDelete(IDictionary keys, IDictionary oldValues) +919
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CREATE PROCEDURE sp_BackupProcessor
@Help BIT = 0,
@Database VARCHAR(30) = NULL,
@BackupName VARCHAR(50) = NULL,
@BackupType VARCHAR(4) = NULL,
@Filename VARCHAR(255) = NULL,
@Description VARCHAR(255) = NULL
AS

Parameters:
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-- Default = ''master''
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@BackupName = ''masterLOG''
-- Default = ''masterLOG''
-- Specifies a name for the backup.
@BackupType = [''FULL'' | ''DIFF'' | ''LOG''],
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@Description = ''255 cahr max''
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Usage:
sp_BackupProcessor
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@Filename = ''FullPathLocalFile'',
@Description = ''Backup Description (255 max)''
'
RETURN 1
END

DECLARE @BackupStmt VARCHAR(500)
SELECT @BackupStmt =
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'INIT' + ', ' +
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'NOFORMAT'
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Sep 21, 2004

Hey all.

I have a table with 100,000 plus records in it, and some are duplicates. Is there any way to delete one of them and not the other. For instance, if I duplicate the table I could run this query.
<cfquery name="query1" datasource="datasource">
DELETE DISTINCT
FROM tablename
WHERE FirstName in ( SELECT FirstName from tablename1 where tablename1.FirstName = tablename.FIRST_NAME AND tablename1.LastName = tablename.LAST_NAME AND tablename1.State = tablename.STATE)
</cfquery>

However, it doesn't work. I know the distinct is not correct. But does anyone know how to achieve this, I have looked all over, and everything I try deletes both records. I was thinking of using some kindof count statement, but it still deletes both of them. Please help. Thanks

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Thanks

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Feb 25, 2005

I have a table with a load of orphaned records (I know... poor design)
I'm trying to get rid of them, but I'm having a brain cramp.

I need to delete all the records from the table "Floor_Stock" that
would be returned by this select statement:

SELECT FLOOR_STOCK.PRODUCT, FLOOR_STOCK.SITE
FROM PRODUCT_MASTER INNER JOIN
FLOOR_STOCK ON PRODUCT_MASTER.PRODUCT =
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BOD_HEADER.SITE
WHERE (BOD_HEADER.BOD_INDEX IS NULL) AND
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I was thinking along the lines of:

DELETE FROM FLOOR_STOCK INNER JOIN
(SELECT FLOOR_STOCK. PRODUCT, FLOOR_STOCK.SITE
FROM PRODUCT_MASTER INNER JOIN
FLOOR_STOCK ON PRODUCT_MASTER. PRODUCT =
FLOOR_STOCK.PRODUCT
LEFT OUTER JOIN BOD_HEADER ON FLOOR_STOCK. PRODUCT =
BOD_HEADER. PRODUCT AND FLOOR_STOCK.SITE = BOD_HEADER.SITE
WHERE (BOD_HEADER.BOD_INDEX IS NULL) AND
(PRODUCT_MASTER.PROD_TYPE IN ('f', 'n', 'k', 'b', 'l', 's'))) F ON
FLOOR_STOCK. PRODUCT = F. PRODUCT
AND FLOOR_STOCK.SITE = F.SITE

... but Sql Server just laughs at me: "Incorrect Syntax near the keyword INNER"

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Hi All,

Yes, It can be a stupid question but I was trying to understand if it is really impossible!
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