Alter Column To Set Default

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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Alter Column Set Default

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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How To Alter A Column With Default Value Defined?

Apr 30, 2008

I have a integer column which has Default value alredy defined. How do i alter this column so that it's defult value will be removed. I want to do this using T-SQL statement. Not through design mode.
 

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Alter Column With Default Constraint

Dec 7, 2001

I can't seem to get the syntax correct for ALTERing an existing column with a default constraint. I've been to Help and BOL. There are examples that show how to use the ALTER command to add a column with a default constraint but not how to do it on an existing column.

Any help would be appreciated.

Sidney Ives

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Apr 25, 2015

How to set a default value to columns in table ..without dropping it.??

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How To Alter A Column With Default Value Defined

Apr 30, 2008



I have a integer column which has Default value alredy defined. How do i alter this column so that it's defult value will be removed. I want to do this using T-SQL statement. Not through design mode.

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ALTER Stmt - Column Default Values

Aug 30, 2001

I'd like to alter a table and add a column:

add_date datetime

Is there a way, in the ALTER statement, to have the value default to the current date -- GETDATE() -- anytime a row is inserted w/out an explicit value for the column.

Thx

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Mar 16, 2004

I need to alter the datatype of a column from smallint to decimal (14,2) but the column was originally created with the following:

alter my_table
add col_1 smallintNot Null
constraint df_my_table__col_1 default 0
go

I want to keep the default constraint, but i get errors when I try to do the following to alter the datatype:

alter table my_table
alter column col_1 decimal(14,2)Not Null
go

Do I need to drop the constraint before I alter the column and then rebuild the constraint? An example would be helpful.

Thx

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May 8, 2015

I have a table with ~30M records. I'm trying to add a column to the existing table with default value and have noticed following ... When using alter with default value- (Executes more than 45 min and killed forcefully)

ex:  
ALTER TABLE dbo.Table_X Add is_Active BIT CONSTRAINT DF_Table_X_is_Active DEFAULT 'FALSE' NOT NULL
GO

When using update command after adding column with alter (without default value) it completes is 5 min.

ex:  
ALTER TABLE dbo.Table_X Add is_Active BIT NULL
GO
UPDATE Table_X SET is_Active = 0 WHERE is_Active IS NULL
GO

Why there is so much of difference in execution times ? I was just trying to understand internal behavior of the SQL in these two scenarios. 

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Cannot Set Default Value For Column Using Alter Column

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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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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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 DEFAULT

Jul 20, 2005

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Jul 20, 2005

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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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Apr 25, 2001

how can you alter a table so that you can add a default value whenever the field is NULL? for example, whenever the table is brought up in a query, NULL is replaced with UNKNOWN

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Jun 12, 2007

I have a default constratint on DateColumn getdate()-1

I have used enterprise manager to update it to yesterday's date everyday.

I would like to have a SQL which can check for the date in the system
or even a trigger which checks when the date changes the constraint is updated itself. If this is not possible I would like to have a stored procedure which I will schedule to run as a job everyday once.

So if today 6/12/2006, the default value in the Datecolumn should be
6/11/2006.

This gives me a error, i tried but could not fix the bug.

Alter Table TABLE_NAME
Alter Constraint DF_DATECOLUMN
Default getdate()-1

Ashley Rhodes

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Jan 8, 2007

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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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Is There A Alter Table Xxxx Drop Default Yyy ?

May 11, 2005

Hi:
I need to change a column's datatype from tinyint to int as follows:
alter table tableName
alter column column1 int

but with error <<'DF__LandMarks__color__6A50C1DA' is depending on it.>>

However, this old default is not part of the constraint. Thus, the only way is to delete it from sysobjects.

unfortunately, the following code I have to commented since they could only be executed line by line, not within a begin...end block.
--exec master.dbo.sp_configure 'allow updates', 1
--reconfigure with override
--delete from sysobjects
-- where name = 'DF__LandMarks__color__6A50C1DA'
-- and type = 'D'
--exec master.dbo.sp_configure 'allow updates', 0
--reconfigure with override

I need to update 10 server around 2500 databases with this change.
I have looked INFORMATION_SCHEMA related views, but not found default related, maybe I missed something.

thanks
David

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Aug 8, 2007

Hi

I am using this query to alter a table

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But above query is adding age field by storing Nulls but not with default values

So I need to add age field to the table by storing default value as 0 and by allowing Nulls

Please advice

Thanks

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Apr 21, 2008

Hi all, I am trying to do a very basic ALTER Command and am trying to change its DEFAULT value. Code below is what I currently have:





Code Snippet

ALTER TABLE Table_1

ALTER COLUMN TEST VARCHAR(1000) NULL DEFAULT 2

Thanks, Onam.

*UPDATE* I found this code but are there alternative methods? Additionally, if I was to update its DEFAULT value again how would I go about doing that? Do I first have to remove the CONSTRAINT and then run the command?





Code Snippet

ALTER TABLE Table_1 ADD CONSTRAINT DF_Albumns_Comment DEFAULT 2 FOR TEST

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

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I change the table & field names for my db as follows:
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Thanks.

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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

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Can this be done programmatically?













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Hi smart people!

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I tried the following but did not work.
Alter Table Phone
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Can we even do it using SQL?

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