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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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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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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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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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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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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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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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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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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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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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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Jul 11, 2007
When you use "Alter Table add Column", it adds the column to the end of the list of fields.
How do you insert the new column to position number 2 for instance given that you may have more than 2 columns?
Create table T1 ( a varchar(20), b varchar(20), c varchar(20))
Alter table add column x varchar(20)
so that the resulting table is
T1 a varchar(20), x varchar(20), b varchar(20), c varchar(20)
Can this be done programmatically?
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Jun 14, 2006
if i have structure of table like a,b,c,d,e column then
i want to alter one more column x b/w b and c column, so that
a,b,x,c,d,e
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May 16, 2006
Well here's one of those excruciatingly simple obstacles:
In SQL Server 2005 (Mgmt Studio): according to BOL, the syntax to set a default value for an existing column is:
ALTER TABLE MyCustomers ALTER COLUMN CompanyName SET DEFAULT 'A. Datum Corporation'
However, when I Check:
alter table CommissionPayment alter column Amount Set Default 0
I get the error message:
"Incorrect syntax near the keyword 'Set'."
No other combinations of this syntax work.
Help! What am I missing?
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Jul 15, 2002
Hi smart people!
I would like to know how to alter a column to have a default value. For instance I have a column AreaCode Char(3) in a table. I have data in the table and now I want to add a default value of '123' to the AreaCode column.
I tried the following but did not work.
Alter Table Phone
Alter Column AreaCode Char(3) Default '123'
Can we even do it using SQL?
Thanks
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Jul 12, 2001
Is there any way to alter a column's name using Transact SQL and not the GUI interface?
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Mar 15, 2006
what is the syntax for multiple column modifications ?
alter table abc
alter column x1 nvarchar(10) null
-- works
alter table abc
alter column x1 nvarchar(10) null,
alter column x2 nvarchar(10) null
-- doesn't work or do i have to use the alter table each time ?
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Nov 15, 2007
Hi,
I am new to SQL Server 2005. Please help
what is the problem with this code..?
ALTER TABLE AM_Master
ALTER COLUMN Last_Updated datetime NOT NULL DEFAULT getdate();
Go
The error is like
Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'DEFAULT'.
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Oct 31, 2007
Hey
I am using postgres, I see different ways to add/change a data type to a column - whats right?
ALTER TABLE table1 ALTER COLUMN SET....??
:)
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Oct 13, 2006
How can you rename a column in a table (from c# code, preferrably from a SQL script command) without deleting the column and re-creating it with a new name?
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Apr 19, 2006
Hi
I had a text type not null column which i wanted to change to a null column.Writing a simple alter statement gave me an eror cannot change text type column so i tried to rename the original column create a new column with the same name and allowing nulls on it and then copying the contents of the renamed column to the new column and finally deleting the renamed column.
EXEC sp_rename 'TableName.ColumnName', 'ColumnName_old', 'COLUMN'ALTER TABLE TableName ADD ColumnName text NULLUPDATE TableName SET ColumnName = ColumnName_oldALTER TABLE TableName DROP COLUMN ColumnName_old
However when i tried to execute these statements in query analyser on the Update statement it gave me the error that ColumnName_old does not exist.
However then I tried to execute these queries one by one I was able to do that.
Can anybody tell me whats causing the queries to not be executed all at once without giving the ColumnName_old does not exist error cause I wanted to run them on live dbs.
any help would be appreciated.
Himani
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Aug 31, 2001
i am altering an int column to identity:
where is something wrong here?
error:
Server: Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'IDENTITY'.
statement:
ALTER TABLE Navigation Alter column [Navigation_ID] int IDENTITY(1,1)
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Feb 5, 2003
I'm attempting to remove the IDENTITY property from a column using the ALTER command but can't seem to find the right syntax. I've tried every conceivable combination I can think of. I can add the property to a column that doesn't have it.
It's easy to do in Enterprise Mgr., but I want to script the change.
I really don't want to drop the table and rebuild if I don't have to.
Sidney Ives
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Oct 11, 2006
I've done some research on setting the default value of a column and found the following code:
ALTER TABLE [table1] ALTER COLUMN [column1] SET DEFAULT 0
I am trying to set column1 within table1 to a default value of 0, column1 is an int data type. But it doesn't work within MS SQL SERVER 2000.
Can anyone tell me what's wrong?
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May 8, 2008
Hello All,
There is a table A in SQL. One of the column of A was IDENTITY before and was getting referenced in other table B.
During migration to SQL 2005, I removed the IDENTITY constraint and imported all the data from 2000 to 2005. Now I have to deploy the IDENTITY back to the column. I am getting an error while executing the code:
ALTER TABLE TableA
ALTER COLUMN ColumnA
ADD CONSTRAINT IDENTITY(445,1)
Can anyone tell me where I am going wrong? Or if there is any other way to do it. There are 50+ tables I need to do the same.
Thanks,
-S
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Oct 30, 2013
How do you alter a table to set a column which is currently int, to int not null?
I have already set all values to either 0 or 1.
Why can't I use:
Alter table myTable alter myCol int not null default(0)
I get a syntax error on the word default. If I remove "default(0)" then the command executes ok, but my Inserts don't work because there's no default value.
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Sep 27, 2005
I have the table table_x:
col1 INT PRIMARY KEY
col2 VARCHAR
I want to add col3 between col1 and col2. In MySQL it's done with the following query:
ALTER TABLE table_x ADD col3 VARCHAR( 10 ) NOT NULL AFTER col1 ;
In sql server all i can do is to add the column to the end of table. Is there a way to insert a new column in the middle or to move a column to left/right?
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Feb 27, 2008
hello experts,
Any body know what is the query for modifying the identity column in a table? i mean modifying from IDENTITY column to int colum or VICE-VERSA
Thanks
Muthu
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Mar 24, 2006
Hi.I have a database I need to supply something (I'm assuming a t-sql script..maybe something else is better) to update customer tables with.The operations include mostly changing varchar lengths, though a couple ofcolumns were renamed.I'd like to maybe figure out how to get Enterprise Manager or Query Analyzerto generate the scripts.I can't just send alter table scripts because I'm involving all sorts ofconstraints that have to be disabled/or dropped, the alter made, then havethem enabled/ or re-created.Basically I'm hoping to get the tools to do the rather large amount of workfor me. I'm targetting sql server 2000.Can someone make a knowledgeable suggestion?RegardsJeff Kish
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Jul 20, 2005
Hello,Easy one for the SQL experts.I have a simple table. For the example let's say it looks like this:CREATE TABLE doc_exb ( column_a INT, column_b VARCHAR(20) NULL)Now I want to alter this table and make the column column_a a floatinstead of an INT.How do I do that? I cannot DROP and ADD the column I would lose somevery precious data.Thanks a lot
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Jun 18, 2007
I tried
Alter table table1 alter column column1 Identity(1,1);
Alter table table1 ADD CONSTRAINT column1_def Identity(1,1) FOR column1
they all can not work,
any idea about this? thanks
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Feb 20, 2008
I would like to alter a table column from char(10) to char(5). I issue the command as :
Alter table mytable alter column mycolumn char(5)
It returns :
Server: Msg 8152, Level 16, State 2, Line 1
String or binary data would be truncated.
How can I perform this task?
Thanks,
Joe.
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Aug 23, 2006
I know that the correct syntax to set the default on a column in SQL Server 2005 is:
Alter Table <TableName> Add Constraint <ConstraintName> Default <DefaultValue> For <ColumnName>
But from what I can gather, the SQL-92 syntax is:
Alter Table <TableName> Alter Column <ColumnName> Set Default <DefaultValue>
This generates an error on SQL Server 2005.
Am I wrong about the standard syntax for this statement? If this is the standard, why doesn't SQL Server 2005 support it? I am trying to avoid code that will only work on certain database managers.
Thanks.
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