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_, 1/1/2008
2, 123_, 1/1/2008
3, 124_, 1/1/2008
4, 124_, 1/1/2008
5, 125_, 1/1/2008
6, 125_, 1/1/2008
7, 126_, 1/1/2008
8, 126_, 1/1/2008
I only want to return the following:
2, 123_, 1/1/2008
4, 124_, 1/1/2008
6, 125_, 1/1/2008
8, 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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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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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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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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Oct 16, 2007
I have a table that I cannot create a unique key for because there is nothing unique and I can concatenate anything together to create one. I am looking for a way to import the data daily and have it only import what is not already in the table like a unique index would normally do. I don't want a sequencial number because that would do me any good. I need the record only in there once but I want to get all of the records in the new table. I have a date field with this if that at all helps. I am wondering if I could create a couple of feeder table to make this work but i am stuck. Any ideas on what to do? Thanks!!!
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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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Jan 10, 2008
Hello!
Is there an easy way to deal with this situation below when reading in data from a SQL Database:
int? myNullableColumn;myNullableColumn = Convert.ToInt32(datarow["datacolumn"]);
Where, ideally, 'myNullableColumn' would be 'null' if the value was 'DBNull.Value'. This does not work because Convert.ToInt32 will not convert 'DBNull.Value to null', but instead throws an error.
Is there a built in funtion that does do this?
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Feb 15, 2002
Hello!
Just looking for advise on dealing with duplicates in database.
I have a contact table that have a bunch of duplicated customer records.
My goal is to combine all duplicated records into one record.
This involves couple tables:contact,contact history ,calendar.
All tables related by common column "accountno".
What would be the best approach for this?
Thank you,
Lena
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Mar 15, 2002
I have the following query in a stored procedure. If there are no rows in the history file, it returns a null. If there some setting or function that would have it return a zero if no rows are found? I use the variable to do arithmetic later on and a null messes everything up.
select@MarketTotal = sum(isnull(MarketValue,0))
fromhistory
whereEmpUID = @EmpUID and
Shares > 0
Thanks,
Ken Nicholson
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Jun 9, 2006
Hi i have the following :
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case call_type_id
*when NULL then ''
else call_type_id
end as 'call_type_id'
from Record_T
* I have also tried when NULL then space(1)
yet the query still returns NULL when this field is empty ?
the idea is to always return data, even if the field is NULL to
replace it with an empty space or spaces.
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Sep 28, 2007
Hello,
Question 1:
In my senario i've developed a system which utilizes 2 database, i've writen queries like db1.dbo.table1 join db2.dbo.table2 etc... Now that db2 is getting huge, client wants to shift it to another server.
I don't know how to modifiy my queries to cope with such situation. Could somebody plz tell me on how to you write queries involving two databases from different servers.
Question 2:
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db1 is not my database and i don't have any control over that, (it's some erp db), is there any way of identifying which rows have been processed. Can the need for db2 be eliminated?
I'm using SQL Server 2005
Thank You,
Sandeep.
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Jul 31, 2006
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Apr 4, 2007
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@tariff_id INT,
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...etc...
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2) all data after the start date, if no end date is supplied
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4) all data between the start and end dates if both are supplied
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May 31, 2007
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Jul 20, 2005
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Jan 30, 2008
Hello,
I have a question, i loaded 2 files into SQL and the files have some cells that have the same model number.
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(and combine their other cell called stock)
and make it into one cell.
Any help would be very very apriciated. Thank you.
i tryed this but it does not work
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I have also Tryed this, IT SHOULD work but I have an error someWhere:
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Feb 22, 2005
Hi
post a sample code
create table testNull(
a int not Null,
b varchar(5),
c varchar(5) )
insert into testNull (a,b,c) values(1,'Alex','test')
insert into testNull (a,b) values(2,'Alex2')
1. select * from testNull
-- return 2 rows
2. select * from testNull
where
a <> 3
and
b <> 'C1'
and
c <>'C2'
-- return ONLY 1 ROW !!!
3. select * from testNull
where
a <> 3
and
b <> 'C1'
and
isNull(c,'') <>'C2'
query 2 will retun only 1 row, because value of column c is Null
Question
Is any setting could be changed on db or server level to prevent errors with missing row in 2-nd query , or I have use isNull operator for every column acepting Null as value ?
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Feb 20, 2004
Hi,
I have a problem with dealing with result sets returned from stored procedures.
I have a procedure like:
CREATE PROCEDURE SampleProcedure
AS
BEGIN
SELECT * FROM SampleTable
END
GO
By executing this stored porocedure is returned result set containing data from SampleTable table. (EXECUTE SampleProcedure)
The returned resultset can be seen in Query Analyzer and can be handled from ADO.NET without any hesitate.
But I can't use this result set from other stored procedure. I tried:
SELECT * FROM (EXEC SampleProcedure)
But there is sintax error in select statement.
Does anybody know, how to store the result set into a teporary table or select it by SELECT statement?
Thanks.
MarF.
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Apr 16, 2004
If I subtract 14 days from a datetime field, will the time of day that I run this query affect the resultset? I am running the query during "normal business hours", 8 am - 5 pm, and the records are entered during this time frame as well.
ddave
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Mar 29, 2015
I have run into a problem when searching for a Movie title that is a number (like the movie name 21)
This is an access database and the Movie_Name is a text field
The SQL I am using is
Select * from Movie_Data where Movie_Title = ‘” & Movie_Name & “’”
This works perfectly for everything except when the Movie_Name = a number
Is there a way to make this search work with both characters and numbers?
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Sep 11, 2007
Hi there,
I am getting a headache trying to research what to do when you have a large number of parameters to include in a query. For example, if I have a large number of checkboxes for the user to pick criteria for a report and they select several, I'm assuming it would be bad practise to say:
WHERE Field = "a" OR Field = "b" OR Field = "c" OR Field = "d" OR Field = "e" OR.....etc etc etc
Is there a good solution for this, given that the number of parameters may vary dramatically depending on what the user selects to include in a report?!
I'm running SQL Server 2000 with an ASP front end.
Any help would be greatly appreciated!
Thanks in advance!
Matt
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Aug 21, 2007
Hello,Suppose I have the following table...name employeeId email--------------------------------------------Tom 12345 Join Bytes!Hary 54321Hary 54321 Join Bytes!I only want unique employeeIds return. If I use Distinct it will stillreturn all of the above as the email is different/missing. Is there away to query in SQL so that only distinct employeeId is returned? noduplicates.I wouuld like to say WHERE no blank fields are present to get theright row to return.Many thanksYas
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Jul 20, 2005
We are looking to store a large amount of user data that will bechanged and accessed daily by a large number of people. We expectaround 6-8 million subscribers to our service with each record beingapproximately 2000-2500 bytes. The system needs to be running 24/7and therefore cannot be shut down. What is the best way to implementthis? We were thinking of setting up a cluster of servers to hold theinformation and another cluster to backup the information. Is thispractical?Also, what software is available out there that can distribute querycalls across different servers and to manage large amounts of queryrequests?Thank you in advance.Ben
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Apr 5, 2008
Thought I would share this since it caused me so much grief.
In some mainframe systems, some dates are stored as the string "00000000". In my SSIS package, I was trying to anticipate for this string, as well as any other combination of zeros (e.g., "000", "0000", etc), since I had already seen lots of dirty data in the flat file (like non-printing characters, etc).
So, what I tried to do was perform an integer conversion on the string and test if it was the equivalent of the numerical value zero:
Code Snippet
(DT_STR)[ColumnName] == 0 ? ....
Now, for some reason, that doesn't work, even though a similar operation in SQL does work:
Code Snippet
SELECT TOP 1 ISNUMERIC('00000000') FROM tableName
In the end, I had to resort to testing for a match on the literal string "00000000" and hope that no other dates came in as "000" or other variation. Fortunately, this has been true so far.
However, the moral of the story is, converting a series of zeros into a numeric zero, and testing against that, does not seem to work. I don't have a good explanation for why that is, but I would guess it has something to do with the limitation of the conversion function.
Happy integrating.
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Apr 10, 2006
Hi
I want to use CLR for developing database object such as stored procedures.
I have read the "Getting Started with CLR Integration" from MSDN help and successfully create my first procedure.
I create an assembly in SQLServer2005 with this code:
CREATE ASSEMBLY helloworld from 'c:helloworld.dll' WITH PERMISSION_SET = SAFE
My questions are :
How should I deal with helloworld.dll after creating Assembly?
Can I delete this file?
What should I do for uploading my application on the webserver?
Should I upload any .dll file?
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