Simple ALTER Command Setting DEFAULT Help
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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Mar 9, 2001
Hi,
I have been trying to figure out how to use ALTER TABLE/ COLUMN to modify a column from an IDENTITY column to one which is not an IDENTITY column.
I would like to do this so that I could add another column (using ALTER) and set it as the IDENTITY column.
Any thoughts?
Your help is much appreciated,
-Scott
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Dec 16, 2005
Hello everyone,
I just started learning sql and I came across a slight problem.
Assume I have a customer table composed of the following fields:
Customer_Number,Sname,Street,City,Postcode,credit_lim,balance.
What I want to do is to drop the Street,city,and postcode fields and add the following: fax,email,and phone.
Is it possible to use the following command:
Alter table customer
Drop column street,city,postcode
Or should I do as following:
Alter table customer
Drop column street
Alter table customer
Drop column city
Alter table customer
Drop column postcode
And the same goes to adding the phone,fax,and email field.
Thank You.
NB: I need to use the Alter command and nothing else
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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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Jul 20, 2005
/* for the google index */ALTER TABLEDEFAULT COLUMNDEFAULT VALUEI've worked out several stored procedures for altering the default columnvalues in a table. They were compiled from books and code snippets foundhere. It was a pain to work out so I've decided to share my work andresearch here. This post is just my way of saying thanks to several othershere for posting with their wisdom and intelligence.MichaelsimpsonAT(dot)cts(dot)comThis procedure gets the constraint name. If you use the design view tosetup a default value, you won't know the system assigned constraint name.This proc makes it an non issue. This code was gleened from this newsgroup.CREATE PROCEDURE [DBO].[GetConstraintName](@tablename sysname,@columnName sysname,@constraintName sysname OUTPUT)asSELECT@constraintName = o1.nameFROMsysobjects o1INNER JOINsyscolumns c ON o1.id = c.cdefaultINNER JOINsysobjects o2 ON o1.parent_obj = o2.idWHERE (o2.name = @tablename) AND (c.name = @columnName)This procedure changes the default value for a column that is a numeric. Ituses the previously define stored procedure to get the constraint name. Atext version of this procedure can be created by removing the cast, definingthe input parameter "newConstraint" as varchar(255).CREATE PROCEDURE [dbo].[ChangeIntConstraint](@tableName sysname,@columnName sysname,@newConstraint int)ASDeclare @conName sysnameexec GetConstraintName @tableName, @columnName, @constraintName = @conNameOUTdeclare @sql nvarchar(1024)set @sql = 'ALTER TABLE ' + @tableName + ' drop constraint ' + @conNameexec(@sql)set @sql = 'ALTER TABLE ' + @tableName + ' ADD CONSTRAINT ' + @conName + 'DEFAULT (' + CAST(@newConstraint AS varchar(255)) + ') FOR ' + @columnNameexec(@sql)
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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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Jul 20, 2005
Hi,I'm trying to run the ALTER TABLE command using a dynamic string for thetable, like so:DECLARE @TableName CHARSET @TableName = 'Customers'ALTER TABLE @TableNameADD ...blahIs this possible? We know this works:ALTER TABLE Customers ADD ...blahIt looks like I need a way to convert the CHAR value to a literal or perhapseven a table ID?Thanks in advance,Paul
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Sep 3, 2007
Dear all
I need to add new column in table TranPay , I use ALTER command on PDA on Button Click
Dim SqlStm = "ALTER TABLE TranPay ALTER COLUMN TranKey IDENTITY (1, 1)"
Dim Dcmd As SqlCeCommand = New SqlCeCommand
Dcmd.Connection = Conn
Dcmd.CommandText = SqlStm
Dcmd.ExecuteNonQuery()
But cannot create new Field , Help me please
Brg ,
Tingnong
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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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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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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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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
Hello,I have an SQL Server 2005 database that I'm trying to create using script.Everything works fine, but when I click on "Database Diagrams" I get anerror message that there is no database owner, and of course when I show theDatabase Properties, the database was created without one. Is there any wayto ALTER AUTHORIZATION to a default owner or system administrator, somethingvalid?Any direction would be appreciated.Thanks!Rick
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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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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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Jan 28, 2008
Hi all,
I need to get a better understanding of alter procedure. If I Create a Procedure in SQL Server 2005, and want to modify that to Alter Procedure statement instead of create procedure... How do I do that??
I'm not an SQL Server person.. I dont understand why my work place needs Alter proceudre all the time but all our procedures have Alter procedure statement. Once they are created they have to be changed to Alter procedure...
Do I just need to change the keyword CREATE to ALTER?? because when I try to save it ,,, it saves it as a .sql file... Not the script.
Immediate reply would be appreciated
Thanks
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Jun 1, 2008
ALTER TABLE customers
add column active_flg int(1)
but i got error.
quote:Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'column'.
what should i do?
ps. thanks for warning... i won't edit the post after i got the answer anymore.
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Sep 12, 2013
I'm trying to add a column trough command "ALTER" and I've tried in many different ways.
Here is the result of statement..
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Jun 27, 2007
Is there any way to extend the Alter Procedure command or fire somekind of event when it is executed in SQL Server 2005?
Thanks,
David
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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 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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Aug 8, 2007
Hi
I am using this query to alter a table
ALTER TABLE myTable ADD age int NULL DEFAULT(0)
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 29, 2008
I'm trying to write some code that will alter column to change its type, in this case from Nvarchar to Int, but I'm not sure if there will be any columns that are uncovertable (say, there's a string that does not have an Int value). In this case, I'd like it to default to 0. Is there a way to write a T-SQL statement to do this, or will I have to write an UPDATE stamement first to clear out any problem cases?
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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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Feb 2, 2006
I have the following to create a new table....
CREATE TABLE dbo.test (Id varchar(20) NOT NULL PRIMARY KEY, Name varchar(256) NOT NULL, visible bit NOT NULL )
I need to set the default value of the bit visible to 1.
How can this be done using a T-SQL statement?
Thanks,
Zath
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Jul 15, 2002
Hi all:
How can I change the Default value of a column in a table using sql?
for instance I have a table called Phone and I have a field called AreaCode and the default now is '123' . I would like to change it to '456'.
Thanks,
Nisha
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Jan 8, 2007
hi
i have to add a column of date datatype and i want to set the default value to getdate(). how to do this using sql script.
thanks
suji
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Jun 23, 2014
Running this query in DR server to start SQL mirroring but encountered an error below.
Query:
use master
go
alter database test set partner= N'TCP://HOSTNAME.DOMAIN.GROUP.INTRANET:5023'
go
Error:
Msg 1452, Level 16, State 6, Line 2
The partner server instance name must be distinct from the server instance that manages the database. The ALTER DATABASE SET PARTNER command failed.
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May 12, 2008
Hi, folks. As part of a larger bunch of code, I am trying to validate some user form input against a database...I've been picking apart code samples and have the following (currently not yet working) code to show for it. I find tons of complex examples out there RE the data controls, and I have those working. But I can't find any examples of just pulling a single record from a DB, sticking it in a variable, and then checking against that variable to get a boolean response. Anyway, here is the code. I am trying to check that a password field filled by the user matches the value located in the DB. I am not married to this code; if someone suggests a better way to do it rather than using a custom validator control, that's fine too:BEGIN CODE SNIPvoid Page_Load(object sender, EventArgs e)
{
Page.Validate();
SqlDataSource1.SelectCommand = "SELECT Password FROM aspnet_Membership WHERE aspnet_Membership.Email='" + emailID.Text + "'";
}
private void CustomValidator1_ServerValidate(object source, System.Web.UI.WebControls.ServerValidateEventArgs args)
{
//between this and the next comment is where I have to get the DB Password field value for the current record
SqlCommand command = new SqlCommand("SELECT Password FROM aspnet_Membership WHERE aspnet_Membership.Email='" + emailID.Text + "'");
command.CommandType = CommandType.StoredProcedure;
sqlConnection.Open();
reader=command.ExecuteReader();
string currentPasswordDb = reader.IsDBNull(reader.GetString("Password"))? null: reader["Password"].ToString();
args.IsValid = false; // Assume False
{
// Compare db entry against user's entry
if (currentPasswordDb == currentPassword.Text)
{
args.IsValid = true;
}
}
} END CODE SNIP The code above give me the following at runtime:Line 14: SqlCommand command = new SqlCommand("SELECT Password FROM aspnet_Membership WHERE aspnet_Membership.Email='" + emailID.Text + "'");Line 15: command.CommandType = CommandType.StoredProcedure;Line 16: sqlConnection.Open();Line 17: reader=command.ExecuteReader();Line 18: string currentPasswordDb = reader.IsDBNull(reader.GetString("Password"))? null: reader["Password"].ToString();Although I'm sure it won't be the last. I'm a former ASP classic developer, moving to c# and .Net. Any ideas?
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Jul 20, 2005
HiIs there a sp command I can issue which will show me what the "sortorder" etc for my MSsql server.I need to re-install it, but need to record what custom setting it hasif any before I wipe it.I have to reinstall to reconfigure the RAID arry under itThanks
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Mar 19, 2004
This isn't really DB related, except for the connection, but I was wondering if any of you guys had run into this before.
I have a ODBC System DSN Setup for a connection to my MSSQL2K Server. My users will occasionally lose the Default Database setting (Drop-down during DSN Setup), forcing me to go in and reset it. It's getting to be a pain in the ass and I was wonder if any of you guys had run into this before.
Thanks!
Ed
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