Is It Possible To Change The Data Type During An Sql Update Statement?

Jun 13, 2007

Hello,



I have a SQL update statement that updates some user names, however, the user names exceed the length of the data type. Currently, for the column username the data type is set to nvarchar (8).



How can I change that to nvarchar(10) in a SQL Update statement?



Thanks in advance.

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Update On Large Table - Change Data Type For Text Column

Dec 10, 2014

I need to update a large table, about 55 million rows, without filling the transaction log, in the shortest time as possible. The goal is to alter the table and change the data type for Text column from VARCHAR(7900) to NVARCHAR(MAX).

Since I cannot do it with an ALTER TABLE statement (it would fill up the transaction log) I'm thinking to:

- rename column Text in Text_OLD
- add Text column of type NVARCHAR(MAX)
- copy values in batches from Text_OLD to Text

The table is defined like:

create table DATATEXT(
rID INTEGER NOT NULL,
sID INTEGER NOT NULL,
pID INTEGER NOT NULL,
cID INTEGER NOT NULL,
err TINYINT NOT NULL,

[Code] ....

I've thought about a stored procedure doing this but how to copy values in batch from Text_OLD to Text.

The code I would start with (doing just this part) is the following, but maybe there are more efficient ways to do it, or at least there's a better way to select @startSeq in the WHILE loop (avoiding to select a bunch of 100000 sequences and later selecting the max).

declare @startSeq timestamp
declare @lastSeq timestamp
select @lastSeq = MAX(sequence) from [DATATEXT] where [Text] is null
select @startSeq = MIN(Sequence) FROM [DATATEXT] where [Text]is null
BEGIN TRANSACTION T1
WHILE @startSeq < @lastSeq

[Code] ....

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Mar 4, 2008

I have Repeater which has checkbox to delete selected items. 
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Dim newStrID As String = ""Dim anItem As RepeaterItem
For Each anItem In Repeater1.ItemsDim chkBoxDelete As CheckBox = anItem.FindControl("Delete")
If chkBoxDelete.Checked Then
strID += (CType(anItem.FindControl("ID"), Label)).Text + ", "
End If
Next
If Len(strID) > 1 Then
newStrID = Left(strID, Len(strID) - 2)
Else
newStrID = ""
End If
 
It's working great, but if I implement it with Update statement, it doesn't work when it has more than one items (it's working fine with one item).
If I just print the statement, it's
UPDATE dbo.mytable SET active='N' WHERE id IN (1, 2, 3, 4)
 
Dim sqlStr As String
sqlStr = "UPDATE dbo.mytable SET active='N' WHERE id IN (" + newStrID + ")"
Dim cmdUpdate As New SqlCommand(sqlStr, conn)
 
I think it's because of data type, since id is Integer and newStrID is string.  What should I do to make it work?
 
Thank you.

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I want to change Set clause of Update Statement dynamically based on some condition.

Basically i have 2 Update statments having same FROM clause and same JOIN clause.

Only diff is SET clause and 1 Where condition.

So i am trying to combine 2 Update statements into 1 and trying to avoid visit to same table twice.

Update t
Set CASE **WHEN Isnull(td.IsPosted, 0) = 0
THEN t.AODYD = td.ODYD**
*ELSE t.DAODYD = td.ODYD*
END
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[Code] ....

But CASE statement is not working...

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Oct 3, 2007



Is there anyway to change the data type of a variable while in an expression?
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or
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May 14, 2008



Hi.

I have tables (they are empty and there are no constraints) with columns typed as varchar. In a database I want to change the type of all the varchar columns in all the tables from varchar to nvarchar. What's the best way to do it? Can you suggest code?

I know that to get all the relevant columns I would issue a query like this

select *
from information_schema.columns
where data_type = 'varchar'

Then I would use a cursor... And that's exactly what I would not like to do. Is there any other way?

Thanx.
Darek

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I know that we can write a script to do this task but i dont know how ?
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The Data Type ‘ntext’ must be changed to ‘text’

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Hi All,

I am using SQL Server 2000 Enterprise Edition fully patched. Database is in Simple Recovery mode.

I need to change a column's data type from "int(4)" to "smallint(2)". I know for sure that there will be no data (precision) lost, because I know the possible values that this column could have.

My problem is that the table I am dealing with has 600,000,000 records in it. I dropped all indexes before I tried to alter the table. But still it is taking forever and filling up my 280GB disk with transaction log file.

I know that in Oracle, if I want I can turn off logging and do these kind of modifications relatively faster.

I was wondering if there is a way of disabling logging before running this alter command.

What is the best practice to handle a situation of this sort?

I appreciate your help.

Thanks in advance,
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Hi

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Jan 11, 2006

Hi
 
I have Try to Create Stored Procedure in C# with the following structure
 
[Microsoft.SqlServer.Server.SqlProcedure]
public static void sp_AddImage(Guid ImageID, string ImageFileName, byte[] Image)
{
       
}
 
But  when I try to deploy that SP to SQL Server Express  , The SP Parameters become in the following Stature
 
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@Image varbinary(8000)
 
But I don€™t want that Data types .. I want it to be in the following format
 
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@ImageFileName nText
@Image Image
 
 
How Can I Control the data type for each parameter ??
Or
How Can I Change the data type of the parameter for the Deployed Stored Procedure ??
Or
How Can I defined the new Data type ??
 
Or
 
What's the solution to this problem ??
 
Note : I get Error when I try to use Alert Statement to change the parameter Data type for the SP
 
ALTER PROCEDURE [dbo].[sp_AddImage]
      @ImageID [uniqueidentifier],
      @ImageFileName nText,
      @Image Image
WITH EXECUTE AS CALLER
AS
EXTERNAL NAME [DatabaseAndImages].[StoredProcedures].[sp_AddImage]
GO
 
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The code;

use master
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with rollback immediate
alter database xxx set single_user
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use xxx
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use master
alter database xxx set read_only
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Hi there,

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So the logic needs to be:

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Additionally, this statement needs to be within a larger Select statement.

I.E.

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FIELD2,
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CONTAINMENT = NONE
ON PRIMARY
( NAME = N'cdcnet', FILENAME = N'S:SQLDATAcdcnet.mdf' , SIZE = 4096KB , FILEGROWTH = 1024KB )
LOG ON
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[code]....

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WHERE [Acct_Num_CH] IS NOT NULL
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UPDATE Recipients
SET [First] = Stages.[First]
, [Last] = Stages.[Last]
FROM
Stages
INNER JOIN Recipients ON
(Stages.UserName = Recipients.UserName
AND Stages.DomainID = Recipients.DomainID)
WHERE
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+ CASE WHEN Stages.[Last] IS NULL THEN 1 ELSE 0 END)
<=
(CASE WHEN Recipients.[First] IS NULL THEN 1 ELSE 0 END
+ CASE WHEN Recipients.[Last] IS NULL THEN 1 ELSE 0 END)

Text execution plan. I've made small annotations with the % information from the graphical execution plan:

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|--Top(ROWCOUNT est 0)
|--Sort(DISTINCT ORDER BY:([Bmk1000] ASC))
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Everything I've heard on the subject suggests you change the index scans to index seeks. How do I do this?

Any other tuning advice is greatly appreciated.

Here are the exact statements I used to create the tables:

CREATE TABLE Recipients (
ID INT IDENTITY (1, 1) NOT NULL,
UserName VARCHAR (50) NOT NULL,
DomainID INT NOT NULL,
First VARCHAR (24) NULL,
Last VARCHAR (24) NULL,
StreetAddress VARCHAR (32) NULL,
City VARCHAR (24) NULL,
State VARCHAR (16) NULL,
Postal VARCHAR (10) NULL,
SourceID INT NULL,

CONSTRAINT PK_Recipients PRIMARY KEY CLUSTERED (DomainID, UserName)
)

CREATE TABLE Stages (
ID INT NULL,
UserName VARCHAR(50) NOT NULL,
DomainID INT NULL,
Domain VARCHAR(50) NOT NULL,
First VARCHAR(24) NULL,
Last VARCHAR(24) NULL,
StreetAddress VARCHAR(32) NULL,
City VARCHAR(24) NULL,
State VARCHAR(24) NULL,
Postal VARCHAR(10) NULL
)
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Dear All,

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I hope thats clear

Also, could someone point me to documentation that explains each parameter in the connection string

Many Thanks

Chris Anderson


My code is:


ConnectionString = "Data Source=.SQLEXPRESS;AttachDbFilename=C:myfile.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"

Connection = New SqlConnection

Connection.ConnectionString = ConnectionString

Connection.Open()
'''''''''''''''''the above code is done at the start of my application


'''''''this code below called during application many times


dim sql as string = "my sql string here"

Dim cmd As SqlCommand = Nothing

cmd = New SqlCommand(sql, Connection)






Try

cmd.ExecuteNonQuery()

Catch err As SqlException

MessageBox.Show(err.Message.ToString())

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End Try



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At first I thought the problem is with the date, but then I can see
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I'm beginning to think that string may be the way to go!!!!!!!

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Later:

It's necessary to update the datatable adapter as the 3.01 and 3.5 CE are not compatible.

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this is the code in the vb page .. Can you please tell me how to solve this problem?Imports System.Data.SqlClient
Imports system.web.configuration

Partial Class Admin_emag_insert
Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Record_DateTextBox.Text = DateTime.Now

End Sub

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Me.VersionTextBox.Text = ""
End Sub

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Dim objDataCommand As SqlCommand
Dim ConnectionString As String
Dim record_date As Date
Dim version As String
Dim emagSQL As String

'save form values in variables
record_date = Record_DateTextBox.Text
version = VersionTextBox.Text

ConnectionString = WebConfigurationManager.ConnectionStrings("HRDBConnectionString").ConnectionString

'Create and open the connection
objConnection = New SqlConnection(ConnectionString)
objConnection.Open()
emagSQL = "Insert into E_Magazine (Record_Date, Version ) " & _
"values('" & record_date & "','" & version & "')"

'Create and execute the command
objDataCommand = New SqlCommand(emagSQL, objConnection)
objDataCommand.ExecuteNonQuery()
objConnection.Close()

AddMessage.Text = "A new emagazine was added successfully"

Me.VersionTextBox.Text = ""

End Sub
End Class
 

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