DB Engine :: Does ALTER COLUMN Statement Converts Data?

Oct 8, 2015

I've some huge table (over 100GB each), these table contain column of NTEXT, IMAGE. Application team needs to change these data types to VARBINARY(MAX), I've tested the modification in our lab and I noticed that the operation has been almost immediate so, I think that DB Engnine has not converted the existing data in the column but it has simply changed the definition of the column.

Or maybe NTEXT and IMAGE can be transparently converted into VARBINARY(MAX)?

Anyway, I want to be sure that the modified table is "coherent" I don't want that at a given point SQL Server tells me that some data is not readable.

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DB Engine :: Alter Database With Rollback Immediate Statement Doesn't Work

Nov 9, 2015

Primary platofrm: Sql12k, 7.0 Ultimate Pro OS

I'm launching the aforementioned statement from one MASTER session windows and I get this message, I am stuck, I though ROLLBACK INMEDIATE go throught any already session open.

Msg 5064, Level 16, State 1, Line 1
Changes to the state or options of database 'GFSYSTEM' cannot be made at this time. The database is in single-user mode, and a user is currently connected to it.
Msg 5069, Level 16, State 1, Line 1
ALTER DATABASE statement failed.

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TSQL - Using ALTER TABLE - ALTER COLUMN To Modify Column Type / Set Identity Column

Sep 7, 2007

Hi guys,
If I have a temporary table called #CTE
With the columns
[Account]
[Name]
[RowID Table Level]
[RowID Data Level]
and I need to change the column type for the columns:
[RowID Table Level]
[RowID Data Level]
to integer, and set the column [RowID Table Level] as Identity (index) starting from 1, incrementing 1 each time.
What will be the right syntax using SQL SERVER 2000?

I am trying to solve the question in the link below:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2093921&SiteID=1

Thanks in advance,
Aldo.

I have tried the code below, but getting syntax error...

ALTER TABLE #CTE
ALTER COLUMN
[RowID Table Level] INT IDENTITY(1,1),
[RowID Data Level] INT;

I have also tried:

ALTER TABLE #CTE
MODIFY
[RowID Table Level] INT IDENTITY(1,1),
[RowID Data Level] INT;

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To Alter Multiple Column With Single Statement

May 5, 2008

It is possible to alter multiple columns within a single alter table statement?
I have got the following URL that tells it is not possible to alter multiple columns within in signle alert table statement.
http://www.blogcoward.com/archive/2005/05/09/234.aspx[^]
Does anyone know about that?

Thanks,
Mushq

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Check For Column Existance Before Alter Table Statement

Feb 14, 2000

Hello all,

I am trying to add columns to several tables in a singular database. I want to check to see if the column exists in a given table first before executing the alter table command so that I can skip that command if the column already exists, and avoid aborting my script prematurely. I can't seem to find a way to check for the column's existance. Any suggestions?

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Alter Column With Data

Nov 8, 2006

I am trying to use T-SQL to alter a column with data already in it from char to varbinary. This is very easy to do in Enterprise Manager, but just for my own knowledge I'm trying to figure out how to do this in T-SQL. I don't mind losing the data (I'm using a temp table to bring the converted data back in), but I want to keep the column in the same place. Here's what I have so far, but I keep getting an implicit conversion error:

UPDATE UserProfile

SET PassID = CAST(PassID AS VARBINARY(128))
GO
ALTER TABLE UserProfile

ALTER COLUMN PassID VARBINARY(128)
GO

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Does ALTER COLUMN Effect The Data?

Aug 10, 2007

I just want to change the length of 2 fields. They're CHAR and NVARCHAR type. I want to change the length from 50 to 75.

Will doing this effect the data? Will it delete the data in those columns? I just want to make sure before I do anything. The table contains about 2.5 million rows, so I don't want to mess anything up. I'm aware that the script may take a while to run and finish, but I'm only concerned about data integrity.

Here is my example script syntax to show what I'm planning to do:

Code Snippet

alter table credit alter column writeoffreason char(75) not null;

Does it matter what type of data is in the columns? For now, it's only CHAR and NVARCHAR.

I also read somewhere that you can increase length but cannot decrease without repercussions?

Thanks!

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Alter Table Alter Column In MSACCESS. How Can I Do It For A Decimal Field?

Jul 23, 2005

Hi people,I?m trying to alter a integer field to a decimal(12,4) field in MSACCESS 2K.Example:table : item_nota_fiscal_forn_setor_publicofield : qtd_mercadoria integer NOT NULLALTER TABLE item_nota_fiscal_forn_setor_publicoALTER COLUMN qtd_mercadoria decimal(12,4) NOT NULLBut, It doesn't work. A sintax error rises.I need to change that field in a Visual Basic aplication, dinamically.How can I do it? How can I create a decimal(12,4) field via script in MSACCESS?Thanks,Euler Almeida--Message posted via http://www.sqlmonster.com

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Alter Table Alter Column

Jul 20, 2005

I would like to add an Identity to an existing column in a table using astored procedure then add records to the table and then remove the identityafter the records have been added or something similar.here is a rough idea of what the stored procedure should do. (I do not knowthe syntax to accomplish this can anyone help or explain this?Thanks much,CBLCREATE proc dbo.pts_ImportJobsas/* add identity to [BarCode Part#] */alter table dbo.ItemTestalter column [BarCode Part#] [int] IDENTITY(1, 1) NOT NULL/* add records from text file here *//* remove identity from BarCode Part#] */alter table dbo.ItemTestalter column [BarCode Part#] [int] NOT NULLreturnGOSET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS ONGOhere is the original tableCREATE TABLE [ItemTest] ([BarCode Part#] [int] NOT NULL ,[File Number] [nvarchar] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_File Number] DEFAULT (''),[Item Number] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Item Number] DEFAULT (''),[Description] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Description] DEFAULT (''),[Room Number] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Room Number] DEFAULT (''),[Quantity] [int] NULL CONSTRAINT [DF_ItemTest_Quantity] DEFAULT (0),[Label Printed Cnt] [int] NULL CONSTRAINT [DF_ItemTest_Label Printed Cnt]DEFAULT (0),[Rework] [bit] NULL CONSTRAINT [DF_ItemTest_Rework] DEFAULT (0),[Rework Cnt] [int] NULL CONSTRAINT [DF_ItemTest_Rework Cnt] DEFAULT (0),[Assembly Scan Cnt] [int] NULL CONSTRAINT [DF_ItemTest_Assembly Scan Cnt]DEFAULT (0),[BarCode Crate#] [int] NULL CONSTRAINT [DF_ItemTest_BarCode Crate#] DEFAULT(0),[Assembly Group#] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Assembly Group#] DEFAULT (''),[Assembly Name] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULLCONSTRAINT [DF_ItemTest_Assembly Name] DEFAULT (''),[Import Date] [datetime] NULL CONSTRAINT [DF_ItemTest_Import Date] DEFAULT(getdate()),CONSTRAINT [IX_ItemTest] UNIQUE NONCLUSTERED([BarCode Part#]) ON [PRIMARY]) ON [PRIMARY]GO

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Alter Table Alter Column...

Oct 8, 2007

I am using sql server ce.I am changing my tables sometimes.how to use 'alter table alter column...'.for example:I have table 'customers', I delete column 'name' and add column 'age'.Now I drop Table 'customers' and create again.but I read something about 'alter table alter column...'.I use thi command but not work.I thing syntax not true,that I use..plaese help me?

my code:
Alter table customers alter column age

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DB Engine :: Can't Use The MERGE Statement / How To Design WHERE Condition For Insert Statement

Nov 5, 2015

I've have a need with SQL Server 2005 (so I've no MERGE statement), I have to merge 2 tables, the target table has 10 fields, the first 4 are the clustered index and primary key, the source table has the same fields and index.Since I can't use the MERGE statement (I'm in SQL 2005) I have to make a double step operation, and INSERT and an UPDATE, I can't figure how to design the WHERE condition for the insert statement.

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ALTER TABLE DROP COLUMN LastUpdated Failed Because One Or More Objects Access This Column.

Mar 7, 2008

Hi I’m trying to alter a table and delete a column I get the following error. The object 'DF__Morningst__LastU__19EB91BA' is dependent on column 'LastUpdated'.
ALTER TABLE DROP COLUMN LastUpdated failed because one or more objects access this column. I tried deleting the concerned constraint. But the next time I get the same error with a different constraint name. I want to find out if I can dynamically check the constraint name and delete it and then drop the column. Can anyone help.IF EXISTS(SELECT 1FROM sysobjects,syscolumnsWHERE sysobjects.id = syscolumns.idAND sysobjects.name = TablenameAND syscolumns.name = column name)BEGIN EXECUTE ('ALTER TABLE tablename DROP CONSTRAINT DF__SecurityM__DsegL__08C105B8')EXECUTE ('ALTER TABLE tablenameDrop column columnname)ENDGO

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Alter Column Results In Incorrect Syntax Near 'column'

Oct 29, 2001

I ran this query against the pubs database and it runs successfully

ALTER TABLE publishers ALTER COLUMN state CHAR(25)

I change the table & field names for my db as follows:
ALTER TABLE customquery ALTER COLUMN toclause CHAR(25)

and run against my database and I get the following error - Incorrect syntax near 'COLUMN'.

My column name is correct - I don't know why it would run fine against pubs, but not my db. I do not have quoted identifiers turned on. I have tried using [] around my column name [toclause], but that didn't change anything. Any help would be appreciated.
Thanks.

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Alter Statement

May 15, 2000

Do anyone knows the syntax for changing the name of a column in a table with the
alter statement or any other statements????

Thanks in advance,
Vic

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Alter Statement

Jan 5, 2001

Hi

Is it possible to remove Identity property of a column using ALTER statement in SQL Server 7.0.

Thanks in advance

Rahul

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Alter A Column To Be The Table Identity Column

Aug 3, 2006

i have a table
table1
column1 int not null
column2 char not nul
column3 char

i want to script a change for table1 to alter column1 to be the table identity column. not primary.

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Does Alter Column Do Work If Column Already The Same As Desired?

Jul 23, 2005

I have a table with a column defined thus: LOCNumber Varchar(100) in atable called Bookdata.If I execute ALTER TABLE BookData ALTER COLUMN LOCNumber varchar(100)on the table, does any work get done on the table and column?Or does SqlServer know that the column is already varchar(100) andnothingneeds to be done?If it does do some work, how do you tell it not to run this as it isalready a varchar(100) column. Right now my program just blindly doesthis ALTER TABLEstatement regardless of any conditions. Is this a potential problem?Thanks for any help.

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Autoincrement With Alter Statement

Jul 3, 2000

looking for necessary syntax to alter table id to autoincrement adding identity statement, not sure on syntax for seed an increment, or if it is possible at all.

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SQL Alter Table Statement With Bit's

Oct 13, 2000

Hi List,

I am trying to add a column with Alter Table, like this:

ALTER TABLE myTable ADD
newColumn bit DEFAULT 0 NOT NULL

This works fine with SQL-server 7, but I get this error in 6.5:

'ALTER TABLE only allows columns to be added which can contain nulls. Column 'newColumn' cannot be added to table 'myTable' because it does not allow nulls.'

I also found this in the help files:

'Columns added to a table must be defined as NULL. When a column is added, the initial value for the column will be set to NULL. This restriction forces the ALTER TABLE statement to fail if the bit or timestamp datatypes are used.'

My question, is there any other way to do this on 6.5 ?

Stefan Nilsson

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Sql Mobile Alter Statement

Jul 19, 2006

Here is the alter statement that I am trying to use to create a relationship between 2 tables. This does not seem to work on mobile. What am I doing wrong?

ALTER TABLE [SubCategory] CONSTRAINT [FK_SubCategory_Category] FOREIGN KEY([CategoryID])
REFERENCES [Category] ([CategoryID])
ON UPDATE CASCADE
ON DELETE CASCADE

This is the error:

There was an error parsing the query. [ Token line number = 1,Token line offset = 27,Token in error = CONSTRAINT ]

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ALTER PROCEDURE Statement Within IF EXISTS

May 28, 2002

Hello.

I'm trying to create a batch sql script which first alters some existing tables via the ALTER TABLE command, I then want to alter some existing stored procedures via the ALTER PROCEDURE command within the same batch. I have found that I can encompas the alter table scripts within a conditional IF EXISTS (Begin/End) but not the alter procesdure scripts. I have looked in reference material and have found nothing to suggest this type of operation is not possible. Is this possible? Is this a know bug fixed by a service pack?

Thanks in advance for any replies.
David.

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Alter Statement To Delete The Default Value Set

Feb 6, 2008

Hi

I want to delete the Default value for a specific column which is set to Null

I've used

ALTER TABLE SYSTEMS_PATIENT_LOG ALTER COLUMN SYSTEMS_LOGID DROP DEFAULT

It is giving error

Msg 156, Level 15, State 1, Line 1

Incorrect syntax near the keyword 'DEFAULT'.

plz could any one tell me where I could be wrong

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Insert Statement That Pulls Column Data From Another Table?

Nov 3, 2006

hi.

i cant get this quite right.

i have a table and i need to insert one column with data from another table. it goes something like this (although i know this is wrong, just here for a visual explaination) :

Code:

INSERT INTO List
(list_date, email_address, list_status, list_email)
values
(
GetDate()
, 'name@rice.edu'
, 0
, SELECT emailAddress FROM Users WHERE id = '72'
)

so, list_email needs the email address from the Users
table. i tried messing around with inner joins but, well,
here i am...

thanks in advace.

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Unpackdecimal Converts Incorrectly

Jul 10, 2007

I downloaded this 7/6/07 and am trying to debug. I have a field that is PICs9(5) and has 00 00 1D as its hex value. The component returns a dt_decimal field value of 20201-

I believe it thinks the 00 are spaces and converts them to ASCII 20. Any ideas on what is wrong here? Is there another step I am missing after the conversion? Any help would be appreciated.

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Estimate Log Space For Alter Table Statement

Jan 31, 2007

My client's website database is hosted by a third party. I need to alter one of the column definitions for the largest table in the database. Unfortunately, the transaction log fills up if I try to alter the table. I've done all the usual stuff like truncating the log, etc., but the simple fact is that the operation requires more log space than we have available. Therefore, we need to purchase additional disk space for the database.
What I'm looking for is a way to roughly estimate how much log space will be required to alter this table so that we purchase enough but not too much additional space. The table has an identity primary key and 4 other single column indexes: one int, one datetime and two varchar(30) columns.
Any suggestions? Thanks in advance.

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Code Skipping The Alter Statement!! URGENT!!

May 14, 2002

I have coded an alter statement for adding a column to a temp table inside an sp,but it skips the alter statement while executing the sp! This happens even if I run the same code on query analyzer too. If I use 'GO' statement before the alter command,then it works fine on Query Analyzer.But, I can't use 'GO' in an sp. I am using the sa account. Any ideas on how to fix this??
Thanks.
Di.

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Syntax Error With "alter Table" Statement

Mar 27, 2001

Folks!

What is wrong with my syntax with the following command?:

alter table EmployeeInfo alter column OriginDate smalldatetime not null default getdate()

I'm getting:

Incorrect syntax near the keyword 'default'

Currently, in my table OriginDate is nullable with no default.
Thanks in advance for your help!

APF

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Transact SQL :: Transaction On Alter Database Statement

Apr 20, 2015

Im working on Partition purge process, where I need to specify following statement:

SET @cmd = 'ALTER PARTITION FUNCTION ' + @function_name + '() MERGE RANGE (@range)'
EXEC (@cmd);
SET @cmd1 = 'ALTER DATABASE '+ db_name()+ ' REMOVE FILE ' + @partition_file
EXEC (cmd1);

I want to put this statement in Begin Tran /Commit statement but getting error that it is not allowed. "ALTER DATABASE statement not allowed within multi-statement transaction"..what are my options to rollback in case there is a failure.

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Transact SQL :: ALTER Statement Is Not Getting Executed In A Batch

May 7, 2015

I have written the following code:

SET NOCOUNT ON
DECLARE @RowCount int; SET @RowCount = 0;
Begin Try
Begin Transaction
--------------------------------------------------------
-----Table Name: AlertsStaticRecord_Archive
-----Column Name: AlertID
--------------------------------------------------------
ALTER TABLE [AlertsStaticRecord_Archive] ALTER COLUMN [AlertID] int NOT NULL;

[Code] .....

But, when I execute these batch, I am getting error:

Msg 8111, Level 16, State 1, Line 11
Cannot define PRIMARY KEY constraint on nullable column in table 'AlertsStaticRecord_Archive'.
Msg 1750, Level 16, State 0, Line 11
Could not create constraint. See previous errors.

Because, the first ALTER statement is not getting executed.

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Can't Rollback Alter Database Statement DDL Trigger

Feb 26, 2008

Recently I created a DDL Server-scope trigger using the following:

create trigger stop_alter_database on all server
for ALTER_DATABASE
as
rollback;
print 'database change stopped by stop_alter_database';
go

Then I ran the following script:

alter database [test] modify file (name=test', maxsize=2028mb);

The result was:

Msg 3609, Level 16, State 2, Line 1

The transaction ended in the trigger. The batch has been aborted.

database change stopped by stop_alter_database

The problem is that when I checked the max size of the data file it had changed. So, the statement was never rolled back. Is there something I'm missing because I can't find any documentation or articles that state the inability to rollback alter database statements. Whats going on?

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Alter Statement To Create Foreign Key Relationships

Jul 18, 2006

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Select Statement That Will Output Related Rows With Different Column Data Per Row?

Apr 27, 2008

Is there a way to build a select statement that will output related rows with different column data per row? I want to return something like:

rowtype| ID | value
A | 123 | alpha
B | 123 | beta
C | 123 | delta
A | 124 | some val
B | 124 | some val 2
C | 124 | some val 3
etc...

where for each ID, I have 3 rows that are associated with it and with different corresponding values.

I'm thinking that I will have to build a temp table/cursor that will get all the ID data and then loop through it to insert each rowtype data into another temp table.

i.e. each ID iteration will do something like:
insert into #someTempTable (rowtype, ID, value) values ('A', 123, 'alpha')
insert into #someTempTable (rowtype, ID, value) values ('B', 123, 'beta')
insert into #someTempTable (rowtype, ID, value) values ('C', 123, 'delta')
etc..

After my loop, I will just do a select * from #someTempTable

Is there a better, more elegant way instead of using two temp tables? I am using MSSQL 2005