Deletion Of Duplicates Without ID Field?

Jun 17, 2014

I need to delete duplicates off a table. Duplicates are reliate on specific columns (COL1, COL2, COL3):

TABLE1

COL1,COL2,COL3,COl4,COL5
A,A,A,B,B
A,A,A,B,C
A,A,B,B,B
A,A,A,H,H
B,B,B,F,F
B,B,B,E,E

For table1, I want to get rid of a rows with matching COL1, COl2, and COl3. The results should be like this:

TABLE1

COL1,COL2,COL3,COl4,COL5
A,A,A,B,B
A,A,B,B,B
B,B,B,F,F

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Duplicates In Table Field

Aug 7, 2014

Im trying to look for duplicates in a table field.. field name is alphanumericCol and table is a user defined table...This is my trigger:

ALTER TRIGGER [dbo].[DUPLICATES]
ON [dbo].[AMGR_User_Fields_Tbl]

FOR INSERT, UPDATE
AS
DECLARE @Alphanumericcol VARCHAR (750)

-- This trigger has been created to check that duplicate rows are not inserted into table.

-- Check if row exists
SELECT @Alphanumericcol
FROM Inserted i, AMGR_User_Fields_Tbl t
WHERE t.AlphaNumericCol = i.AlphaNumericCol
AND t.Client_Id = i.Client_Id
-- (@Alphanumericcol = 1)
-- Display Error and then Rollback transaction
BEGIN
RAISERROR ('This row already exists in the table', 16, 1)
ROLLBACK TRANSACTION
END

The result i get is, if i input a duplicate number it fills in a null in the field so my question is how do i get it to tell me its duplicate and let me insert a new one

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Duplicates Problem In Datetime Field, Help!!

Aug 26, 2004

I have a table with a 'datetime' column. I need to make this as the Primary Key. But, currently there are lot of duplicates in this datetime column, which is not allowing me to make it as PK. How do I update the data in this field which makes it unique in all the rows, at the same time the date part remains same as old.
Probably, I need to add few milliseconds of 'time' for each row in an increasing fashion, like 1 ms to 1st row, 2 ms to 2nd row, 3 ms to 3rd row etc..?
There are million rows in the table, only 1000 of them are duplicates. Any help?

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T-SQL (SS2K8) :: Rank Duplicates But Only Rows Involved In Duplicates?

Oct 22, 2014

I have a table with 22 million Business records. I can see that there are duplicates when I group by BusinessName and Address and Phone. I'd like to place only the duplicates into a table, with a ranking, oldest business key gets a ranking of 1.

As a bonus I'd like each group to have a distinct group name (although not necessary, just want to know how to do this)

Later after I run more verifications to make sure these are not referenced elsewhere I'll delete everything with a matchRank > 1 out of the main Business table.

DROP TABLE [dbo].[TestBusiness];
GO
CREATE TABLE [dbo].[TestBusiness](
[Business_pk] INT IDENTITY(1,1) NOT NULL,
[BusinessName] VARCHAR (200) NOT NULL,
[Address] VARCHAR(MAX) NOT NULL,

[code]....

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Converting Duplicates Records Into Non Duplicates?

Jan 26, 2015

Is there a query or a way to convert duplicates value in a column to non duplicates.

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Deletion

Nov 6, 2007

Hi all,

I have a table in xyz database and there is no column in table like creation_date or modified_date.

The problem is I want to delete records which has been added in the table before 1st jan 2007.

The size of table is 85 GB

Immediate help would be appriciable.

Regards,
Frozen

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Restrict Deletion

Mar 11, 2007

What would be the best practice to prevent users who didn't create a record in sql from deleting? When a record is created I have the username who created the record in one of the fields. I was thinking maybe a query?
 
Thank you in advance.

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Deletion Problem

Jun 4, 1999

It is an option to set deletion without getting logged since I have problem to delete two years historical data and would like to keep this year data on my 80MB rows. Actually I create a new table to get copy one-year data and I truncated the old table. I am wondering if there is other better way to do this task.

TIA,

Stella Liu

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Replication Without Deletion

Mar 19, 2007

Hello there,

We are currently setting up out production server to the following requirements:

1. Every month, delete records that haven't been changed in the last 90 days.
2. Replicate insert statements to a backup database which will keep track of all data, and act as an archive/data warehouse.

The first step is easy, as it is just a script that checks the date of the last change on each row. However, the second step is a bit more tricky. We tried setting up replication between two test databases, but we ran into the following problem: Whenever old data has been deleted in the production database, the replication agent deletes it in the data warehouse database too.

Is it possible to override or disable this, so data is only inserted/updated, and not deleted? No applications using the database deletes records, so database integrity should not be a problem.


Thanks for your time,

Ulrik Rasmussen

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Database Deletion

Apr 15, 2008

While performing import actions I had a system freeze, when the system returned the sessions had been closed and the database had vanished, with the help of support we recovered the database only to find that the original project ID had a suffix attached ( Original 40/0110, New 40/0110-1 ), when I try to return it to it's original numbering convention it says it has to be a unique number which suggests to me it is not deleted but hiding in the background, can the original be recovered or is it possible to renumber the recovered database, I have searched the whole of the databases and the original is nowhere to be seen.

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DB Deletion Time

Jun 4, 2008

Is there an option to find out the deleted DBs on a server?

------------------------
I think, therefore I am - Rene Descartes

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Deletion In Trigger

Oct 12, 2013

table1 has a PK_tbl1 which matches FK_tbl1 in table2 and the relationship is one to one. Like this:

table1 has columns of UnitId, Code ...
table2 has columns of ItemID, UnitId ...

So if I need remove an item from table1 I must remove the matched one in table2 first.

delete from table2 where UnitId = xxx
delete from table1 where UnitId = xxx

Now I need create a trigger on table1 for deletion:

CREATE Trigger [dbo].[Table1_Delete]
ON [dbo].[Table1]
FOR DELETE
As

[code]....

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How To Prevent Db Deletion

Nov 22, 2006

Hi

I want to try and protect myself from my own stupidity. I have a number of sql databases, but one is LIVE. It is easy to drop tables but I want to set something (e.g. a password) which will help prevent me from dropping tables on the live database.

Any help/direction here would be appreciated.

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Deletion Of Duplicate Row

Jul 23, 2005

Hi Everyone,I have a table in which their is record which is exactly same.I want to delete all the duplicate keeping ony 1 record in a table.ExampleTable AEmpid currentmonth PreviousmonthSupplimentarydays basic158 2001-11-25 00:00:00.000 2001-10-01 00:00:00.000 2.004701.00158 2001-11-25 00:00:00.000 2001-10-01 00:00:00.000 2.004701.00158 2001-11-25 00:00:00.000 2001-10-01 00:00:00.000 2.004701.00I want to delete 2 rows of above table.How can I achieve that.Any suggestion how can i do that.Thank you in advanceRichard

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Deletion Query

May 29, 2008

Ok, so I have an issue, was wondering if anybody else has any suggestions.

I have a table that is pretty large, in all regards. It is a "message" table that holds text messages that users send to each other.

1. Has some data fields, integers, dates, some bit columns, a message subject field (varchar(250)), and a message body field (field type = text)
2. Table contains about 70 million records
3. Table has 6 indexes associated to it
4. Table has 2 views associated to it.
5. Table has 8 foreign keys associated to it.

I need to delete, oh, about 90,000 records out of this 70 million record table. I am able to disable the foreign keys to this table for deletion, but that does not seem to mitigate the problem. I think the issue lies with having to update the indexes as well as the views.

When I execute the select statement to retrieve the records I need to delete, it executes pretty quickly, no problems there that I can see.

The issue comes when I try to delete the records, it takes way too long, and we know it. We let it run for an hour and it didn't really get anywhere. This is in a server environment, some pretty decent hardware, 8gig memory, fast SCSI drives, 8 core processors, i don't know the exact specifics, but they're not bad.

Here's a DBCC SHOWCONTIG on our table

DBCC SHOWCONTIG scanning 'message' table...
Table: 'message' (1448040590); index ID: 1, database ID: 13
TABLE level scan performed.
- Pages Scanned................................: 51602
- Extents Scanned..............................: 6486
- Extent Switches..............................: 6948
- Avg. Pages per Extent........................: 8.0
- Scan Density [Best Count:Actual Count].......: 92.83% [6451:6949]
- Logical Scan Fragmentation ..................: 0.54%
- Extent Scan Fragmentation ...................: 0.93%
- Avg. Bytes Free per Page.....................: 93.5
- Avg. Page Density (full).....................: 98.85%
DBCC execution completed. If DBCC printed error messages, contact your system administrator.

This is from our dev environment which is but a portion of our production db- but I presume our production environment will have similar percentages (not necessarily the pages scanned)

Any suggestions on how to delete records efficiently?

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Feb 7, 2008



Hello,
I want to delete a 0KB file on one of the disks in my server. Do any of you have any idea how to do it??
Thanks,
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Aug 15, 2006

Im using SQL enterprise manager v8, a few days ago I got a report that a user account was deleted. I was wondering what logs would point this out. I've been through the event review and i am not seeing any usefull info.

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Oct 13, 2005

Obviously to delete all records from DB table is simple, however, I would like to make my whole Live DB pretty much empty.  I've copied all my data from my test DB over to my live DB (didn't mean to but I did).  I would like to remove all the data and the identity values, resetting them back at their original values.  Is there a simple way or do I have to do it the hard way.  That being going in and removing Identity, saving and then placing identity back on the DB Table.

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Jun 11, 2007

hi,

i am trying to delete rows where a particular column (hours) has the same value for the same member (primary key) but where the effective dates are different. i want to delete the duplicate(s) rows which have the most recent effective date(s).

can you help?

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Database Still 'exists' After Deletion

Apr 14, 2006

hi

Basically, I create a database with sql, then I delete it manually(not via sql statment. This is a problem which I realise. In fact, you can't delete the database because the VS 2005 still is using it) I run the same code again,
then it says the database still exists, even it is physically destroied.

------Here is the errors:
System.Data.SqlClient.SqlException: Database 'riskDatabase' already exists.
at System.Data.SqlClient.SqlConnection.OnError(SqlExc eption exception, Boolea
n breakConnection)

------The evidence that the database doesn't exist physically:
Unhandled Exception: System.Data.SqlClient.SqlException: Cannot open database "riskDatabase" requested by the login. The login failed.

------The code:
/*
* C# code to programmically create
* database and table. It also inserts
* data into the table.
*/

using System;
using System.Collections.Generic;
using System.Text;

using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.IO;

namespace riskWizard
{
public class RiskWizard
{
// Sql
private string connectionString;
private SqlConnection connection;
private SqlCommand command;

// Database
private string databaseName;
private string currDatabasePath;
private string database_mdf;
private string database_ldf;

public RiskWizard(string databaseName, string currDatabasePath, string database_mdf, string database_ldf)
{
this.databaseName = databaseName;
this.currDatabasePath = currDatabasePath;
this.database_mdf = database_mdf;
this.database_ldf = database_ldf;
}

private void executeSql(string sql)
{
// Create a connection
connection = new SqlConnection(connectionString);

// Open the connection.
if (connection.State == ConnectionState.Open)
connection.Close();

connection.ConnectionString = connectionString;
connection.Open();

command = new SqlCommand(sql, connection);
try
{
command.ExecuteNonQuery();
}
catch (SqlException e)
{
Console.WriteLine(e.ToString());
}
}

public void createDatabase()
{
string database_data = databaseName + "_data";
string database_log = databaseName + "_log";

connectionString
= "Data Source=.\SQLExpress;Initial Catalog=;Integrated Security=SSPI;";

string sql = "CREATE DATABASE " + databaseName + " ON PRIMARY"
+ "(name=" + database_data + ",filename=" + database_mdf + ",size=3,"
+ "maxsize=5,filegrowth=10%)log on"
+ "(name=" + database_log + ",filename=" + database_ldf + ",size=3,"
+ "maxsize=20,filegrowth=1)";

executeSql(sql);
}

public void dropDatabase()
{
connectionString
= "Data Source=.\SQLExpress;Initial Catalog=" + databaseName + ";Integrated Security=SSPI;";

string sql = "DROP DATABASE " + databaseName;

executeSql(sql);
}

// Create table.
public void createTable(string tableName)
{
connectionString
= "Data Source=.\SQLExpress;Initial Catalog=" + databaseName + ";Integrated Security=SSPI;";

string sql = "CREATE TABLE " + tableName +
"(userId INTEGER IDENTITY(1, 1) CONSTRAINT PK_userID PRIMARY KEY," +
"name CHAR(50) NOT NULL, address CHAR(255) NOT NULL, employmentTitle TEXT NOT NULL)";

executeSql(sql);
}

// Insert data
public void insertData(string tableName)
{
string sql;

connectionString
= "Data Source=.\SQLExpress;Initial Catalog=" + databaseName + ";Integrated Security=SSPI;";

sql = "INSERT INTO " + tableName + "(userId, name, address, employmentTitle) " +
"VALUES (1001, 'Puneet Nehra', 'A 449 Sect 19, DELHI', 'project manager') ";
executeSql(sql);

sql = "INSERT INTO " + tableName + "(userId, name, address, employmentTitle) " +
"VALUES (1002, 'Anoop Singh', 'Lodi Road, DELHI', 'software admin') ";
executeSql(sql);

sql = "INSERT INTO " + tableName + "(userId, name, address, employmentTitle) " +
"VALUES (1003, 'Rakesh M', 'Nag Chowk, Jabalpur M.P.', 'tester') ";
executeSql(sql);

sql = "INSERT INTO " + tableName + "(userId, name, address, employmentTitle) " +
"VALUES (1004, 'Madan Kesh', '4th Street, Lane 3, DELHI', 'quality insurance mamager') ";
executeSql(sql);
}

public static void Main(String[] argv)
{
string databaseName = "riskDatabase";
string currDatabasePath = "E:\liveProgrammes\cSharpWorkplace\riskWizard\A pp_Data";
// Need to be more flexible.
string database_mdf = "'E:\liveProgrammes\cSharpWorkplace\riskWizard\ App_Data\riskDatabase.mdf'";
string database_ldf = "'E:\liveProgrammes\cSharpWorkplace\riskWizard\ App_Data\riskDatabase.ldf'";

RiskWizard riskWizard = new RiskWizard(databaseName, currDatabasePath, database_mdf, database_ldf);
riskWizard.createDatabase();
riskWizard.createTable("userTable");
riskWizard.insertData("userTable");
//riskWizard.dropDatabase();
}
}
}

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For Deletion..trigger Is Not Working

May 4, 2004

Hi,
I have this trigger, it is working fine when i add new data but it doesn't work when I delete data from the table?

Any idea?

Any help will be highly appreciated.


CREATE TRIGGER [PROP_AMT] ON [dbo].[cqe_item]
FOR INSERT, UPDATE, DELETE
AS
DECLARE
@var_DB_contract INTEGER,
@var_CQE INTEGER,
@var_PC INTEGER,
@var_item VARCHAR(7),
@var_AMT_PAID INTEGER,
@var_AMT_RET INTEGER,
@var_ITEM_NEW VARCHAR(1),
@var_quant DECIMAL,
@var_fiyr INTEGER,
@var_amt_result INTEGER,
@var_amt_ret_result INTEGER,
@var_amt_old INTEGER,
@var_amt_ret_old INTEGER,
@var_quant_result INTEGER,
@var_quant_new INTEGER,
@var_quant_old INTEGER,
@Item_new VARCHAR(7),
@var_chk varchar(1)

--If Exists (Select 1 From Inserted) And Exists (Select 1 From Deleted)
set @var_db_contract =(SELECT a.db_contract FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
IF @var_db_contract IS NOT NULL
BEGIN
SET @var_db_contract=(SELECT a.db_contract FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_cqe=(SELECT a.cqe_numb FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_pc=(SELECT a.pc_code FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_item=(SELECT a.item_no FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_fiyr=(SELECT a.fy_item FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
set @var_chk ="Y"
END
ELSE
BEGIN
SET @var_db_contract=(SELECT a.db_contract FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_cqe=(SELECT a.cqe_numb FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_pc=(SELECT a.pc_code FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_item=(SELECT a.item_no FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_fiyr=(SELECT b.fy_item FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
set @var_chk="N"
END
SET @var_amt_paid=(SELECT a.amt_paid_item FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_amt_old=(SELECT b.amt_paid_item FROM inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no )
SET @var_amt_result =ISNULL(@var_amt_paid,0) - ISNULL(@var_amt_old,0)

SET @var_amt_ret = (SELECT a.amt_ret_item from inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no)
SET @var_amt_ret_old=(SELECT b.amt_ret_item from inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no)
SET @var_amt_ret_result = isnull(@var_amt_ret,0) - isnull(@var_amt_ret_old,0)

SET @var_quant_new = (SELECT a.quantity from inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no)
SET @var_quant_old =(SELECT b.quantity from inserted a,deleted b where a.db_contract = b.db_Contract and a.cqe_numb = b.cqe_numb and a.pc_code = b.pc_code and a.item_no = b.item_no)
SET @var_quant_result = isnull(@var_quant_new,0) - isnull(@var_quant_old,0)
SELECT @item_new = new_item
FROM VALID_ITEM
WHERE DB_CONTRACT = @var_db_contract
AND PC_CODE = @var_PC
AND ITEM_NO = @var_ITEM

UPDATE ae_contract
set amt_paid_contr = isnull(amt_paid_contr,0) +@var_amt_result,
amt_ret_contr = isnull(amt_ret_contr,0) + @var_amt_ret_result
where db_contract = @var_db_contract

IF @item_new = 'N'
BEGIN
update vendor
set used_amt = isnull(used_amt,0) + @var_amt_result + @var_amt_ret_result
where db_vendor = (select gen_contr from ae_contract
where ae_contract.db_contract=@var_db_contract);
END
UPDATE enc_det
set amt_paid_fy = isnull(amt_paid_fy,0) + @var_amt_result,
amt_ret_fy = isnull(amt_ret_fy,0) + @var_amt_ret_result
where db_contract = @var_db_contract
and pc_code = @var_pc
and fy = @var_fiyr

UPDATE valid_item
set tamt_ret_item = isnull(tamt_ret_item,0) + @var_amt_ret_result,
tamt_paid_item = isnull(tamt_paid_item,0) + @var_amt_result,
qtd = isnull(qtd,0) + @var_quant_result
where db_contract = @var_db_contract
and pc_code = @var_pc
and item_no = @var_item

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Daily Deletion Of Records

May 12, 2004

Ladys, Gentlement, I have table that grows anywhere from 200,000 to 1,000,000 records perday. Besides that I need to keep at least 6 months historical data from this same table. The transaction log was purged after each batch when testing data monthly. I'm looking for some way of deleting just one day's data if it meets a criteria. It must remain within the 6 months period of historical data. This is what I've come up with so far"

select * FROM dbo.Temp_table WHERE datediff(day, DATE_TIME, getdate()) >= 180

If it meets this criteria I can change the select to a delete? Please Let me know what you think

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Apr 17, 2008

Does anyone has a script/exe for periodic file deletion, using date comparison?


------------------------
I think, therefore I am - Rene Descartes

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Jan 2, 2006

i am using this statement for deleting a single row in sql table.
"DELETE FROM Random WHERE NewID= '" & strwinner & "'"

where "strwinner" is the variable which contains the row to be deleted.
the problem is that when i check the table in sql the row which was supposed to be deleted is sitll there.it does not give me any error statement or something.
iam executing this statement by using ExecuteNonQuery in my .aspx page.
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Oct 19, 2007

hi

i am using sql server 2005 express edition , with asp.net

i am trying to delete a table programmatically

a button on a form , if the client clicked it , then a table
should be dropped .

but always i get an error message , that says "cannot drop table <table name> , becaust it does not exist or you do not have premissions to do that"

could any body help plz

thax

ghassan

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Jul 23, 2005

We have an employee table that contains bank details and are experiencingproblems with account numbers being erased and lost. In order to track downwhy this is happening (either due to our application code or SQLreplication) we'd like to be able to prevent certain columns from beingdeleted if they already contain some data.Is it possible to setup a check constraint to prevent our ee_acct_no columnsfrom being set to NULL or blank strings if it contains an account number(i.e a 9 digit number)? We have setup the column to allow NULL's as we don'talways know employees bank details until later, so we do need to put them onour database without bank details initially.Also, if possible, can someone suggest a stored procedure or trigger i couldcreate that would fire a user-defined error message that would email anoperator if a bank account number changed?Many thanksDan Williams.

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Jul 20, 2005

I was trying to relocate my transaction log to a bigger drive usingsp_movedevice but I made a mistake in the syntax of the second parameterand put only the path, not the path and the file name.Now my database is marked as "suspect" and I get an error message in my logupon database start up saying that the log file cannot be open.Is there a way to have MS SQL 6.5 "forget" all the logs of this database,create new ones and restart the database? The logs contained nothingimportant, I had truncated them an hour or so before I made my mistake. Ijust want to make sure the data are still usable.When I look at the devices with sp_helpdevice, I can see a log that existand is hopefully in pristine condition and the one that doesn't existanymore.I looked in the archives of various newsgroups but couldn't find somethingthat correspond closely to my situation. I saw something similar but withMS SQL 7.0(http://groups.google.com/groups?hl=...om %26rnum%3D4)using sp_attach_db/sp_detach_db. What would be the equivalent with version6.5?Thanks!Charles--Charles-E. Nadeau Ph.Dhttp://radio.weblogs.com/0111823/

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Nov 5, 2007



SET identity_insert dbo.table1 on

GO

insert into dbo.table1(
PrimaryKeyCol,Col1, Col2 .....)


select

PrimaryKeyCol,Col1, Col2......

from [Sever].Database.dbo.table1 as ClientColumn

where not exists(

select * from dbo.table1 as ServerColumn

where ServerColumn.PrimaryKeyCol = ClientColumn.PrimaryKeyCol

)

DELETE FROM [Server].Database.dbo.table1

where exists(

where ServerColumn.PrimaryKeyCol = ClientColumn.PrimaryKeyCol

)



SET identity_insert dbo.table1 off

GO


I can't complie this code.. anybody see where I went wrong??

Thanks for all your help.

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Deletion Of Rows In Table

May 5, 2015

One of my customer is asking to delete 95% of the rows in an table which has around 645708 rows in a table.Now my concerns are that , what criteria we need to follow while deleting huge records in table, what are the steps we need to be taken care of?And after deletion, what are the maintenance tasks we need to perform to be up to mark without any issues.Lastly will deletion of 95 % of rows improve performance of a table?

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Auto Deletion Of Records Sqlserver

Aug 18, 2007

 Hi I am not sure if I am at right place, anyhow I hope I am :) Now the question: I am using an ASP.net Application with SQL-Server. I want to make a page so that it set the expiration time (date)  for certain record and once that time reaches, it deletes those records, or make any updates to the record (what ever applicable). I also want to control this auto deletion from my application, means that turn this On/Off whenever needed. I am not sure how to start this. I was told by a friend that I need to use triggers from SQL-server but I need some help. Can anyone help me out on this? RegardsMykhan 

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Retrival And Deletion Of Duplicate Rows.

Nov 17, 2000

I have a table...say tb1 of 20 columns which has 2.7 million rows. There is no PK and the only way of identifying a unique row can be done with combination of column1+column2+column3.
Can anyone help me how to idetify the duplicate rows and also delete the duplicate rows. And to commit after every 5000 rows.
ITS VERY URGENT....Thanks in advance.

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Page 2 - Deletion Of Duplicate Values

Jun 11, 2007

Quote: Originally Posted by achoudry ps i am using sqlserver well, whaddya know, eh

do you realize you posted in the mysql forum?

i'm gonna move this thread to the sql server forum

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Rows Deletion Affected By Cursor

Dec 29, 2004

Hello,

I am using a cursor to navigate on data...of a table....
inside the while @@fetch_status = 0 command
I want to delete some rows from the table(temporary table)
in order to not be processed...
The problem is that I want this deletion to affect the rows the cursor has.

I declared a dynamic cursor but it does not work.

Does anyone know how I can do this??

Thanks :)

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