How Alter Only Datatype For Existing Column

Oct 24, 2007

I Have table Emp contains 3 columns one column is EName that datatype is char. now I want to change char to Varchar(4) . but column is primary key . and it is refernced by othertable columns .

i write query
alter table emp alter column ename varchar(4)
but it throws an error is
Msg 5074, Level 16, State 1, Line 1
The object 'PK_emp is dependent on column 'Ename'.
Msg 4922, Level 16, State 9, Line 1
ALTER TABLE ALTER COLUMN ename failed because one or more objects access this column.

please help me
asap.
Regards
Swamy

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Alter Column Datatype With Default Constraint

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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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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Nov 20, 2013

I have created a table as below mentioned. Then I want to alter the ID column as identity(1,1) without dropping the table as well as losing the data.

create table dbo.IdentityTest
(
id int not null,
descript varchar(255) null,
T_date datetime not null
)

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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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May 3, 2007

How can I alter a userdefined datatype.

eg: A user defined datatype of Dt_Quantity numeric(16,0)

Want to change it to numeric(16,3).

Is it possible?

If it requires a system catelog updation please help.

This requirment is came after the implementation of the DataBase.

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May 7, 2015

I am trying to change a column from a decimal(18,2) to a decimal(18,3). What is the SQL command to alter this table?

SQL Command:

alter table TableName
alter column ColumnName decimal(18,3) [null]

the above command is right ?

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Alter Table Datatype Giving Error Date To Bit

Nov 20, 2014

IF EXISTS (SELECT * FROM SYS.COLUMNS WHERE NAME =N'Case_Escalated__c' AND OBJECT_ID = OBJECT_ID(N'[Case]'))
begin
alter table [Case] alter column Case_Escalated__c bit null
print 'Case_Escalated__c altered sucessfully for [Case]'
end

Msg 1792, Level 16, State 1, Line 3
Alter table 'Case' failed because the added fixed column might cause existing data to go beyond the maximum allowable table row size of 8060 bytes.

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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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Jul 28, 2015

I have a excel file which has a column called "Code" and their values are A,B,C,D,E,F,G,H. I want to create a new column called "status" based on the values of "Code".

Code:

A
B
C
D
E
F
G
H

If A,C,E,G then "status" = "Active" else if B,D,F,H then "Status" = "Inactive". I like to do it using "Derived Column".

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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 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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Mar 5, 2004

Hi,

I have a column that is unique that I would like to make into an IDENTITIY column after I insert some data into it.

I tried

alter table <table_name>
alter column <col_name> int Identity (1,1)

but it fails.

Ajay

WORD4LIFE
(http://www.word4life.com)

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Mar 30, 2004

I simply need the ability using SQL to add columns in an existing table before (or after) columns that already exist.

The MS SQL implementation of ALTER TABLE doesn't seem to provide the before or after placement criteria I require. How is this done in MS SQL using SQL or is there a stored procedure I can use?

Thanks.

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Jul 20, 2005

Hi(SQL Server 2000)I have an existing table (t) with a column that is NOT an identity column(t.ID), but it has manually inserted "row numbers". I want to make thiscolumn become an identity column. This column is a key field to othertables, so I want to keep the row numbers that are allready inserted.From the Query Analyzer, how do I do this?Thanks in advance!Regards,Gunnar V�yenliEDB-konsulent asNORWAY

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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:

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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:

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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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