I loaded one table via SSIS and found that it contained many duplicate records (from the input source). I can create a SQL task to delete them, but I wonder if SSIS offers and task "out of the box" to delete dups?
TAI,
barkingdog
I need a sql statement to delete duplicate records.
I have a college table with all colleges in the nation.
I noticed that all of the colleges were listed twice.
How do I delete all of the duplicate records.
Here is my table.
Colleges
-------------------
schoolID - smallint NOT NULL,
schoolName - varchar(60) NULL
Can someone help me out with the sql statement???
I'm running SQL Server 6.5.
- ted
Hi All,
I am having one table named MyTable and this table contains only one column MyCol. Now i m having 10 records in it and all the records are duplicate ie value is 7 for all 10 records.
It is something like this,
MyCol
7
7
7
7
7
7
7
7
7
7
Now i m trying to delete 10th record or any record then it gives me error
"Key column information is insufficient or incorrect. Too many rows were affected by update."
What should i do if i want only 4 records insted 10 records in my table?
How do i delete the 6 records from table?
Plz help me.
Regards,
Shailesh
gaurav writes "respected sir
here i have a question
how we can delete duplicate records through query in SQL Server
thanks"
Rajarajan writes "Kindly don't ignore this as regular case.
This is peculiar.
I need to delete one of duplicate records only if they occurs consecutively.
eg.
1. 232
2. 232
3. 345
4. 567
5. 232
Here only the first record has to be delete. Kindly help me out.
Thank you.
Regards,
R.Rajarajan"
Hi All,
So.. I'm a complete newb to SQL stuff.
I managed to find the 'Deleting Duplicate Records' from SQLTeam.com (thanks, by the way!!).. I managed to modify it for one of my tables (one of 14).
-- Add a new column
Alter table dbo.tblMyDocsSize add NewPK int NULL
go
-- populate the new Primary Key
declare @intCounter int
set @intCounter = 0
update dbo.tblMyDocsSize
SET @intCounter = NewPK = @intCounter + 1
-- ID the records to delete and get one primary key value also
-- We'll delete all but this primary key
select strComputer, strATUUser, RecCount=count(*), PktoKeep = max(NewPK)
into #dupes
from dbo.tblMyDocsSize
group by strComputer, strATUUser
having count(*) > 1
order by count(*) desc, strComputer, strATUUser
-- delete dupes except one Primary key for each dup record
deletedbo.tblMyDocsSize
fromdbo.tblMyDocsSize a join #dupes d
ond.strComputer = a.strComputer
andd.strATUUser = a.strATUUser
wherea.NewPK not in (select PKtoKeep from #dupes)
-- remove the NewPK column
ALTER TABLE dbo.tblMyDocsSize DROP COLUMN NewPK
go
drop table #dupes
Now that I've got that figured out, I need to write the same thing to fix the other 13 tables (with different column info)- and I'll need to run this daily.
Basically I've put together some vbscript that gathers inventory data and drops it into an MSDE db (sorry - goin for 'free' stuff right now). Problem is it has to run daily so that I'm sure to capture computers that turned on at different times etc which ever-increases my database 'till I bounce off the 2GB limit of MSDE.
So the question is, what would be the best way to do this? Can I put the code into a stored procedure that I can execute each day?
Thanks for your help....
I have an SQL tables [Keys] that has various rows such as:
[ID] [Name] [Path] [Customer]
1 Key1 Key1 InHouse
2 Key2 Key2 External
3 Key1 Key1 InHouse
4 Key1 Key1 InHouse
5 Key1 Key1 InHouse
Obviously IDs 1,3,4,5 are all exactly the same and I would like to be left with only:
[ID] [Name] [Path] [Customer]
1 Key1 Key1 InHouse
2 Key2 Key2 External
I cannot create a new table/database or change the unique identifier (which is currently ID) either. I simply need an SQL script I can run to clean out the duplicates (I know how they got there and the issue has been fixed but the Database is still currently invalid due to all these duplicate entires).
Any help would be greatly appreciated.
Thanks,
I have an SQL tables [Keys] that has various rows such as:
[ID] [Name] [Path] [Customer]
1 Key1 Key1 InHouse
2 Key2 Key2 External
3 Key1 Key1 InHouse
4 Key1 Key1 InHouse
5 Key1 Key1 InHouse
Obviously IDs 1,3,4,5 are all exactly the same and I would like to be left with only:
I cannot create a new table/database or change the unique identifier (which is currently ID) either. I simply need an SQL script I can run to clean out the duplicates (I know how they got there and the issue has been fixed but the Database is still currently invalid due to all these duplicate entires).
Any help would be greatly appreciated.
Thanks,
Hi ,
i am using sql server 2005.
i have one table where i need to find records that have same citycode and hospitalcode and doctorcode then delete the record keeping only one record of them
my problem is table structure have idendtity column which is unique.
that is m table structure is something like
recid citycode hospcode doctorcode otherdesp
1 0001 hp001 d0001 ...
2 0002 hp002 d0002 ...
3 0001 hp001 d0001 ...
4 0002 hp002 d0002 ...
please suggest
thank you
I have a situation where deleting old records is blocking updating latest records on highly transactional table and getting timeout errors from application.
In details, I have one table called Tran_table1 in OLTP database. This Tran_table1 is highly transactional table, it will receive data for insert/update continuously
While archiving 2 years old records from Tran_table1 into Tran_table1_archive in batches(using DELETE OUTPUT INTO clause), if there is any UPDATEs on Tran_table1,these updates are getting blocked and result is timeout errors in application.
Is there any SQL Server hints to avoid blocking ..
I was wondering if anyone had a suggestion as to how to delete duplicate rows from a table. I have been doing this:
SELECT * INTO TempUsersNoRepeats
FROM TempUsers2
UNION
SELECT * FROM TempUsers3
This way I end up with a total of four tables (the fourth table being the original Users table) and I was hoping that there was a way that I could do this all within the the original Users table and not have to create the three TempUsers tables.
Thanks,
Ron
Hi, i need the suggestion here in very familiar db situation ..i have a main table and a primary key of that table is used in many other table as foreign key.If i am deleting a record in a main table,how do i make sure that all the corresponding record in the associated tables,where that foreign key is used, gets deleted too?What are my options?Thanks
View 5 Replies View RelatedI'm trying to delete some records from some tables in a SQL Server 2008 R2 database. There's a foreign key relationship between the two tables. To make things easier here's the definition of both tables:
-- Parent table
CREATE TABLE [dbo].[PharmInvInItemPackages](
[InventoryInDetailID] [int] IDENTITY(1,1) NOT NULL,
[InventoryInID] [int] NOT NULL,
[ItemPackageID] [int] NOT NULL,
[code]....
I have one table having three columns.This table contains lot of repeated records. I want to delete this records .
In this below example i want to delete all the records which columns id and no columns contains same values.
id no sequence
------------------------------------
35 35432 1
35 35432 2
35 35432 3
36 35432 1
35 45623 1
First three records the columns id and no contains same value. I want to delete this three records.
But in last record for id =35 and no column =45623.it is not repeated so it should not be deleted.
Is there a way to delete records from table passing parameter as tablename? I won't to delete all records from a table dependent on table selected. i'm trying to do this with stored procedure...Table to delete depends on the checkbox selected.
Current code(works)
Public Function DelAll()
MZKDB = MZKHRFin
If sloption = "L" Then
sqlConn.ConnectionString = "Server=" & MZKSrv & ";Initial Catalog=" & MZKDB & ";Integrated Security=SSPI;"
ElseIf sloption = "S" Then
sqlConn.ConnectionString = "Server=" & MZKSrv & ";User id=sa;Password=" & MZKPswd & "; Initial Catalog=" & MZKDB & ";"
End If
sqlConn.Open()
sqlTrans = sqlConn.BeginTransaction()
sqlCmd.Connection = sqlConn
sqlCmd.Transaction = sqlTrans
Try
sqlCmd.CommandText = sqlStr
sqlCmd.ExecuteNonQuery()
sqlTrans.Commit()
frm2.txtResult.Text = frm2.txtResult.Text & " " & TableName & " Prior records have been deleted from the database." & vbCrLf
SetCursor()
Catch e As Exception
Try
sqlTrans.Rollback()
Catch ex As SqlException
If Not sqlTrans.Connection Is Nothing Then
frm2.txtResult.Text = frm2.txtResult.Text & " " & TableName & " An exception of type " & ex.GetType().ToString() & " was encountered while attempting to roll back the transaction." & vbCrLf
SetCursor()
End If
End Try
frm2.txtResult.Text = frm2.txtResult.Text & " " & TableName & " Records were NOT deleted from the database." & vbCrLf
SetCursor()
Finally
sqlConn.Close()
End Try
ResetID()
End Function
If cbGenFY.Checked Then
sqlStr = "DELETE FROM FIN_FiscalYear"
TableName = "dbo.FIN_FiscalYear"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenFY()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenFund.Checked Then
sqlStr = "DELETE FROM FIN_Fund"
TableName = "dbo.FIN_Fund"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenFund()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenFunc.Checked Then
sqlStr = "DELETE FROM FIN_Function"
TableName = "dbo.FIN_Function"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenFunc()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenObject.Checked Then
sqlStr = "DELETE FROM FIN_Object"
TableName = "dbo.FIN_Object"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenObject()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenCenter.Checked Then
sqlStr = "DELETE FROM FIN_Center"
TableName = "dbo.FIN_Center"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenCenter()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenProject.Checked Then
sqlStr = "DELETE FROM FIN_CodeBook"
TableName = "dbo.FIN_CodeBook"
DelAll()
sqlStr = "DELETE FROM FIN_BudgetAccnt"
TableName = "dbo.FIN_BudgetAccnt"
DelAll()
sqlStr = "DELETE FROM FIN_Budget"
TableName = "dbo.FIN_Budget"
DelAll()
sqlStr = "DELETE FROM FIN_Project"
TableName = "dbo.FIN_Project"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenProject()
timeStepStop = Date.Now
TableName = "dbo.FIN_Project"
DispOneCounts()
End If
If cbGenProgram.Checked Then
sqlStr = "DELETE FROM FIN_Program"
TableName = "dbo.FIN_Program"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenProgram()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenGL.Checked Then
sqlStr = "DELETE FROM FIN_gl"
TableName = "FIN_gl"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenGL()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenRevenue.Checked Then
sqlStr = "DELETE FROM FIN_Revenue"
TableName = "FIN_Revenue"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenRevenue()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbGenBank.Checked Then
sqlStr = "DELETE FROM FIN_VendorBankAccnt"
TableName = "dbo.FIN_VendorBankAccnt"
DelAll()
sqlStr = "DELETE FROM FIN_VendorBank"
TableName = "dbo.FIN_VendorBank"
DelAll()
sqlStr = "DELETE FROM FIN_bankAdd"
TableName = "dbo.FIN_bankAdd"
DelAll()
sqlStr = "DELETE FROM FIN_bankTERMS"
TableName = "dbo.FIN_bankTerms"
DelAll()
sqlStr = "DELETE FROM FIN_bank"
TableName = "dbo.FIN_bank"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenBank()
timeStepStop = Date.Now
TableName2 = "dbo.FIN_bankTERMS"
TableName3 = "dbo.FIN_BankAdd"
TableName4 = "dbo.FIN_VendorBank"
TableName5 = "dbo.FIN_VendorBankAccnt"
DispTwoCounts()
End If
If cbFinAP.Checked Then
sqlStr = "DELETE FROM FIN_Period"
TableName = "FIN_Period"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenPeriod()
timeStepStop = Date.Now
DispOneCounts()
End If
If cbFinVM.Checked Then
sqlStr = "DELETE FROM FIN_vendorClass"
TableName = "FIN_vendorClass"
DelAll()
sqlStr = "DELETE FROM FIN_vendorAdd"
TableName = "FIN_vendorAdd"
DelAll()
sqlStr = "DELETE FROM FIN_vendor"
TableName = "FIN_vendor"
DelAll()
sqlStr = "DELETE FROM FIN_AddressType"
TableName = "FIN_AddressType"
DelAll()
sqlStr = "DELETE FROM FIN_VendorStatus"
TableName = "FIN_VendorStatus"
DelAll()
sqlStr = "DELETE FROM States"
TableName = "States"
DelAll()
sqlStr = "DELETE FROM Country"
TableName = "Country"
sqlStr = "DELETE FROM FIN_IndustrialCodes"
TableName = "FIN_IndustrialCodes"
DelAll()
ClearCounts()
timeStepStart = Date.Now
GenIndCodes()
timeStepStop = Date.Now
DispOneCounts()
DelAll()
ClearCounts()
timeStepStart = Date.Now
FinVendStat()
timeStepStop = Date.Now
TableName = "FIN_VendorStatus"
DispOneCounts()
ClearCounts()
timeStepStart = Date.Now
FinAddrType()
timeStepStop = Date.Now
TableName = "FIN_AddressType"
DispOneCounts()
ClearCounts()
timeStepStart = Date.Now
GenCountry()
timeStepStop = Date.Now
TableName = "Country"
DispOneCounts()
ClearCounts()
timeStepStart = Date.Now
GenState()
timeStepStop = Date.Now
TableName = "States"
DispOneCounts()
ClearCounts()
timeStepStart = Date.Now
FinVM()
timeStepStop = Date.Now
TableName = "FIN_Vendor"
TableName2 = "FIN_VendorAdd"
DispTwoCounts()
End If
If cbFinbudget.Checked Then
sqlStr = "DELETE FROM FIN_BudgetAccnt"
TableName = "FIN_BudgetAccnt"
DelAll()
sqlStr = "DELETE FROM FIN_Budget"
TableName = "FIN_Budget"
DelAll()
sqlStr = "DELETE FROM FIN_CodeBook"
TableName = "FIN_CodeBook"
DelAll()
ClearCounts()
TableName = "FIN_Budget"
timeStepStart = Date.Now
FinBudget()
timeStepStop = Date.Now
DispOneCounts()
ClearCounts()
TableName = "FIN_Codebook"
TableName2 = "FIN_budgetAccnt"
timeStepStart = Date.Now
FinCodeBook()
timeStepStop = Date.Now
DispTwoCounts()
ClearCounts()
End If
Hi,
I have a query that is executing properly but i want to delete the results of the query. I am trying to do it but i am messing up somewhere in the syntax
Can anybody help me out with this problem?
Below is the query
DELETE FROM DPT_NEW_BINS WHERE(
Select BIN,LEFT(ACCT_NUM_MIN,16), LEFT(ACCT_NUM_MAX,16), ISO_CTRY_CD, REGN_CD ,PROD_TYPE_CD FROM DPT_NEW_BINS o
WHERE EXISTS (SELECT BIN,LEFT(ACCT_NUM_MIN,16), LEFT(ACCT_NUM_MAX,16), ISO_CTRY_CD, REGN_CD ,PROD_TYPE_CD FROM DPT_temp_NEW_BINS i
WHERE o.ACCT_NUM_MIN = i.ACCT_NUM_MIN AND o.ACCT_NUM_MAX = i.ACCT_NUM_MAX))
CAN SOMEBODY POINT OUT MY MISTAKE?
No transaction log involved, only the table itself.
Use sp_spaceused "table_name" to check the space used.
It seems the table size actually increased from the beginning to the middle of deletion, at the end of deletion, its size decreased.
Recovery mode set to be simple, autoshrink turned on.
The tables tested are about 50MB ~ several GB in size, all have the same behavior. The size increased about 5%~10%.
Since the deletion is called from another software, I want to know if it is possible for SQL Server to have this behavior or it is absolutely the 3rd party software's issue
Thanks!
I have many large tables with millions of records in a SQL Server database. They all use an Identity column which is the clustered index. We haven't been deleting any records until recently because disk space is now becoming a problem.
Assuming I delete a lot of old records, I'm thinking that the freed up space in the data pages won't be reused. New records will be added at the end of the table because of the Identity column being the clustered index. So the table will keep getting bigger even though there is lots of free space.
Assuming I'm right, then how do I recapture this unused space? Is an alter table rebuild the best way? Or rebuilding the clustered index?
How do i remove duplicate records from a table with a single query without using cursors or anything like that.Sample :tempCol11221P.S The table has only one column
View 2 Replies View RelatedHello friends,
I have a one problem, i have a table in that some reocrds are duplicate.i want to find which records are duplicate.
for exp. my table is as follows
emp_id emp_name
1 aa
2 bb
3 cc
1 aa
3 cc
3 cc
and i want the result is like
emp_id emp_name
1 aa
1 aa
3 cc
3 cc
3 cc
Hello All,
Please show me how to delete duplicate records from a table.
Thanks in Advance
I have a table that has duplicate records with the exception of the ID and I am trying to write a while loop that would go through the table, locate all duplicate records based on a field called LASTNAME.
View 5 Replies View RelatedHello,
I need some help on this.
I want to retrieve all the duplicate records from a particulat column.
For eg suppose i have a table named testtable
columns in the table : item_id,ref_no,title,address
now i need to check if there are any duplicate entries in the ref_no column and if there are any retrieve the records.
Gaurish Salunke
Software Developer
OPSPL
I just discovered that all my records appear twice inside my table, inother words, they repeat on the row below. How can I delete all of theduplicates? I'm sure there must be a tidy line of sql to do that.Thanks,Bill
View 1 Replies View RelatedI uploaded some data about 2 or 3 times and it keep appending it to thetable.Now I want to keep only first duplicate and delete rest of.Suppose part number 123 has been added 3 times so I want to keep only 1record.Thanks
View 1 Replies View RelatedHi Guyz
say i have a table
10011 NULL NULL Classical NULL
10011 NULL NULL Classical NULL
10004 NULL NULL Classical NULL
10004 NULL NULL Classical NULL
10004 NULL NULL Classical NULL
10005 NULL NULL Classical NULL
i want to eliminate the duplicate records and atable should look like
10011 NULL NULL Classical NULL
10004 NULL NULL Classical NULL
10005 NULL NULL Classical NULL
do we have any simple sql to do it or something complex.
thanks in advance !
Hello Frnds....Can anybody give the answer of this question as How to Delete duplicate records from Table ?
I Know that with check option and also with Unique Constraint we can avoid to enter duplicate records in table but How to delete from table which does not have any constraints ?
any useful SQL Queries that might be used to identify lists of potential duplicate records in a table?
For example I have Client Database that includes a table dbo.Clients. This table contains various columns which could be used to identify possible duplicate records, such as Surname | Forenames | DateOfBirth | NINumber | PostalCode etc. . The data contained in these columns is not always exactly the same due to differences caused by user data entry; so some records may have missing data from some of the columns and there could be spelling differences too. Like the following examples:
1 | Smith | John Raymond | NULL | NI990946B | SW12 8TQ
2 | Smith | John | 06/03/1967 | NULL | SW12 8TQ
3 | Smith | Jon Raymond | 06/03/1967 | NI 99 09 46 B | SW12 8TQ
The problem is that whilst it is easy for a human being to review these 3 entries and conclude that they are most likely the same Client entered in to the database 3 times; I cannot find a reliable way of identifying them using a SQL Query.
I've considered using some sort of concatenation to a new column, minus white space and then using a "WHERE column_name LIKE pattern" query, but so far I can't get anything to work well enough. Fuzzy Logic maybe?
the results would produce a grid something like this for the example above:
ID | Surname | Forenames | DuplicateID | DupSurname | DupForenames
1 | Smith | John Raymond | 2 | Smith | John
1 | Smith | John Raymond | 3 | Smith | Jon Raymond
9 | Brown | Peter David | 343 | Brown | Pete D
next batch of duplicates etc etc . . . .
I have this table:
id | Name | Age
==================
1 | AAA | 22
1 | AAA | 22
2 | BBB | 33
2 | BBB | 33
2 | BBB | 33
3 | CCC | 44
4 | DDD | 55
I need to delete from this table all the duplicate records and leave only one record. The table will looks like this:
id | Name | Age
==================
1 | AAA | 22
2 | BBB | 33
3 | CCC | 44
4 | DDD | 55
I work with sqlCE for Mobile...
Hi,
I want to delete duplicate row from a very big table. Actually this table is used by a SP, and it's a very important. Due to duplicate record entry it's falling. I use bellow method for discarding the dulicate record.
PLz tel me it's the most efficent way to this job or u have some other way
1. I drop the primary key
2. Then I let all the duplicate record came into the table
3. then I removed them by using Group by clause and setting rowcount(1 - group by count).
4. Put primary key back and update the statistics.
Code is
If Exists (select * from SYSINDEXES where name='PrimaryKey' and id=Object_id('AdjustmentTransactions'))
DROP INDEX AdjustmentTransactions.PrimaryKey
Insert into AdjustmentTransactions
(UrnABS, UrnBar, .................Description)
Select a.UrnAbs,
a.UrnBar,
a.TxnUrn.....................
a.Description
from TxnProcess a
where a.InsUpFlag = 'I'
and a.Processed = 'N'
and ASCII(b.TxnType) = 65
Set @row_count=0
Declare dup_cursor cursor for
Select UrnBAR,TxnUrnBarPat,count(*) counts from AdjustmentTransactions
group by UrnBAR,TxnUrnBarPat having count(*) > 1
Open dup_cursor
Fetch next from dup_cursor into @VUrnBAR,@VTxnUrnBarPat,@count
While (@@Fetch_Status = 0)
Begin
Select @row_count=@count-1
Set rowcount @row_count
Delete from AdjustmentTransactions where UrnBAR=@VUrnBAR and TxnUrnBarPat=@VTxnUrnBarPat
Fetch next from dup_cursor into @VUrnBAR,@VTxnUrnBarPat,@count
End
Set rowcount 0
Close dup_cursor
Deallocate dup_cursor
If not Exists (select * from SYSINDEXES where name='PrimaryKey' and id=Object_id('AdjustmentTransactions'))
CREATE UNIQUE INDEX [PrimaryKey] ON [dbo].[AdjustmentTransactions]([UrnBAR], [TxnUrnBarPat]) ON [PRIMARY]
Update Statistics AdjustmentTransactions
Thanks
Sandipan
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.
There is no Primary Key in the csv file that can be used.
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
DELETE TOP (SELECT COUNT(*) -1 FROM dbo.temppkgactions WHERE dupcount > 1 )
FROM dbo.pkgactions
DROP TABLE temppkgactions
Thanks
Hai
I have problem in deleting duplicate rows. I have a identity column in my table, if I try to use correlatted sub query with Delete command it gives error.
The other problem I have is I have a date column in my table and update that column with current date and time. If use a query to fetch a records on a particular day , it does not return any rows
select * from rates where ch_date >='02/11/99' and ch_date<='02/11/99'
If I use convert also there is some other problems. Is there any way to force date checkings to be done excluding time.
Thanks
This is an imaginary problem while discussing ROWID in ORACLE.
Consider a table without primary key, unique key, uniuqe index.
A row has inserted into the table many times.
I want to delete all but one dulicated rows. With any 'where' clause all rows(duplicated)
will be deleted. In ORACLE i can achieve this using ROWID as follows:
Delete from Table_name
where < all column values >
and ROWID <> ( Select max(rowid) from Table_name where < all column values > )
How can this be achieved in MS SQL Server 6.5 ?
According to Dr. Codd's Golden rules for RDBMS one is that
One should be able to reach each data value in the database by using
table name, row idenfication value and column name.
Does MS SQL Server 6.5 satisfy this requirement ?
Also How many of Dr. Codd's 13 Golden Rules for RDBMS does MS SQL Server 6.5
Satisfy? Which doesn't ?
Any discussion about Codd's Rules is welcome.
- Gunvant Patil
gunvantp@yahoo.com