DB Design :: Add A New Int Identity Column As Primary Key To Already Existing Table

Sep 3, 2015

We want to add a new int identity column as a primary key to an already existing table that has a primary key on Guid. Here is the DDL:

CREATE TABLE [dbo].[VRes](
[VResID] [uniqueidentifier] NOT NULL,
[Mes] [varchar](max) NOT NULL,
[PID] [uniqueidentifier] NOT NULL,
[Segt] [int] NOT NULL,

[code]....

Also we currently have 3 million rows on this table. Is having an integer column as identity column and primary key better or shd I consider using BigInt?

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Adding Column With Primary Key In Existing Table

Jan 21, 2014

I want to add new primary key into existing table which already has a primary key. But,I do not want to remove the old primary key, since there are many records and the old primary key also have relationship with other table

When I am using this query:

alter table hem154
add indexNO uniqueidentifier default newid()

alter table hem154
add CONSTRAINT pk_hem154_indexNo PRIMARY KEY (PK_indexNO)
go

Note:
Hem154 ~ Table name
indexNo ~ Column Name

I get this runtime error:

Msg 1779, Level 16, State 0, Line 1
Table 'hem154' already has a primary key defined on it.
Msg 1750, Level 16, State 0, Line 1

Could not create constraint. See previous errors.

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Adding An Identity Column To Existing Table

Sep 11, 2006

I removed all constraints in order to load a bunch of data into a table, now I'm wondering if I can add an identity column to this table which does contain data or if I have to create a new table with the identity column and insert the data into that.

thx

Kat

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Oct 19, 2015

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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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Not Able To Create An Identity Column For An Existing Database Table

Feb 1, 2008

I am working with a table in SQL server. I have a column that I want to designateas an identity column. I am not able to do this, because the field for "Identity Specification" is not editiable.
What I did was I went to sql server, right clicked and selected "Modify".The column properties dialog box/edit grid is then displayed with attributesthat I can modify.
There are two major nodes in this dialog box. One is named "General" and the otheris named "Table Designer". I expand the "Table Designer" node and then go to the node labeled "Identity Specification" It is here where I would like to edit thevalues.
The values that are listed for edit are listed below. BUT, the problem is thatI can place my cursor in those fields, but I am not able to change/edit them.Can anyone tell me what the problem is here? and how I can fix it?
+Identity Specification (Is Identity) Identity Increment Identity Seed

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Jun 10, 2015

how to add identity column into existing table in sql.

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Nov 6, 2015

I have come up with one scenarios where I have three table like Product, Services and Subscription. I have to create one table say Bundle where I can have some of the product id , service id and Subscription id , i.e. a bundle may contains sum prduct , services and subscription . How I can design these relations ?

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Nov 28, 2007

Hi everyone,How do I set a primary key on an existing column using SQL statements? I have column persID of type int in table employees. How do I correctly apply the ALTER command to change persID type to INT IDENTITY(1,1) NOT NULL? Thanks in advance

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Making An Existing Column An Identity Column

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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To Make An Existing Column Become An Identity Column

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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Problem In Using Sqlbulkcopy To Insert Data From Datatable(no Identity Column) Into Sql Server Table Having Identity Column

Jun 19, 2008

Hi,
I am having problem in bulk update of a sql server table haning identity column from a datatable( has no identity column) using sqlbulkcopy. I tried several approaches, but it does not show any error nor is the table getting updated. But the identity value seems to getting increased every time.
thanks.
varun

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Change Increment Value For Existing Identity Column

Jul 20, 2004

Hi,
How to Change Increment Value for existing Identity Column (MS SQL2000) ?

I know how to change the seed :
DBCC CHECKIDENT (activity, RESEED,4233596)

but I need the future id generated with step 2
4233596
4233598
4233600
I would like to do it using T-sql because I will need to do it every day after syncronising with another SQL server .

Thanks,
Natalia

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Mar 30, 2006

Hi All,
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Mar 7, 2008

How do i drop/remove the identity property for an existing column in all Tables where the Identity column is a primary key.
The Script below was used to find all the tables that have an Identity Column as a primary key in a database. Now i want to remove the identity property from the Identity Columns that have a primary key in the database.

select pk.table_name, c.column_name,

from information_schema.table_constraints pk

INNER JOIN information_schema.key_column_usage c ON c.TABLE_NAME = pk.TABLE_NAME

and c.constraint_name = pk.constraint_name

where constraint_type = 'PRIMARY KEY'

and COLUMNPROPERTY(object_id(pk.table_name), column_name, 'IsIdentity') = 1

ORDER BY pk.table_name, c.column_name

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Jan 22, 2007

What is the different between Primary key and Identity Column? and when should I them?
(Im just a beginner with databases...)

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Apr 5, 2000

Can anyone explain the Difference between Primary Key and Identity Column in MSSQL Server 6.5. Please give me any example if possible.
Thanks for Help!!!!

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How To Add Primary Key In Existing Table

Aug 17, 2006

i have table fff .it has two fields one is fno int , another is fnamevarchar(20)ffffno fname-------- -----------100 suresh102 rameshhere there is no not null constraint and identity column theni am add primary key constraint fno column pls help me

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Jan 13, 2007

Hello --
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I'm enforcing this programmatically (in my C# code) at this point, but I'd like to back that up with a constraint in the database itself.
Any help is appreciated.
Eric

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May 22, 2008

We are developing a batabase which is meant for financial domain,so it will import data from different source system..
and data from our data base will be further passed to other applications.

In contex of our system integration with other data sources ,whether is it a good idea to have a auto integer primary key a or to implement some logic to generate primary key?

Can some one guide us to some pratical data base design case studies?or some best practices.?

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Mar 6, 2008

How do i find all the tables that have an Identity Column as a primary key in a database. Thanks.

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Mar 2, 2004

Has anybody ever tried to do this. I can't figure it out. All I want to do is take an existing table that already has values in the column that I want to change and add the identity property to yes and set the identity seed and increment to a specific number. I know you can do it in the CREATE TABLE statement but is there a way to use the ALTER TABLE command?

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Apr 26, 2008

Hi Friends,
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Thanks in Advance

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Hi, I have the lovely task of overhauling some of our SQL-based systems. I've found many tables that don't have unique identifying numbers that really should have them. I've searched around and people keep mentioning the Identity field as being similar to Autonumber in Access. The only examples I could find involved setting up a new table... but I need to add (and populate) an identity column to an existing database table. Does anyone know the command for this?

Example... my table is called PACountyTown. It currently has 3 columns: County, Town, and Area. I wish to call the identity-ish field RecordID.

Thanks in advance!

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May 20, 2015

I normalized the below tables but I am finding it difficult to copy data to the new tables. How do I copy data from existing table to the normalized tables? see the table structure below and other supporting information:

SKU_DATA(SKU,SKU_Description,Department,Buyer) Note: this table already has data in it.
CREATE TABLE SKU_DATA (
SKU
Integer NOT
NULL,

[code].....

The table structure above have two three determinants( SKU,SKU_Description and Buyer). SKU and SKU_Description are candidate keys. Primary key is SKU.

Normalization : SKU_DATA(SKU,SKU_Description, Buyer)
BUYER(Buyer,Department)

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Jun 3, 2008

hi,
i have a table with data in the following format (dont ask why it was done this way, its not something i can change)

so my table looks like this:

point :timestamp :value
_________________________
var1 11:00 5
var2 11:00 2.3
var3 11:00 21
var1 12:00 5.2
var2 12:00 2.4
var3 12:00 18

and so on.

i would like to have my data rearranged to look like the following:

timestamp :var1 value :var2 value :var3 value
________________________________________________
11:00 x y z
12:00 a b c
....

i am working with my database in a c sharp application. so if anyone does come up with a solution for this maybe keep that in mind so that i can discuss how to impliment it in the code.

thanks guys.

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I am designing a database. I want to define a automatic sequence on a table primary key field. what is the best solution for it?

I know I can enable identity property for a field, but it has some problems ( for example its seed jumps on restart and unsuccessful events)

I also can use some calculated sequences. for example I can calculate max of the filed values and after incrementing use it as key for new inserted record.

which one is better?

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I have a table of raw data where each column can be null. The thought was to create an identity key (1,1) and set as primary for each row. (name/ address / zip/country/joindate/spending) with surrogate key: "pkid".However other queries will not use this primary key. So for instance they may count the # of folks at a zip, select all names, addresses etc. The queries may order by join date, or select all the people that joined on a specific date.No other code would logically use the primary key (surrogate primary id key), therefore would it still have any performance benefits? at this time the table would have no clustured or nonclustured indexes or keys. I'm curious if there are millions of records.

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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.

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Thanks.

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Nov 14, 2007

Hi everyone!

I just started with SQL and SQL Server 2005. I cantfind in my books how to add a column to an existing table. It should be a primary key, auto_increment column.

Hope someone can help, many thanks in advance

Greetings from Vienna Austria

landau

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existing table looks like this:
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commentAuthor
authorEmail
comment
commentDate (getDate())
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I have an existing table (see below).

-----------
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-----------

I want to add the column below after the [FormCode] when my SPROC runs.
-----------
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-----------

Any ideas would be a big help?
TIF

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Dec 5, 2005

Sorry I'm pretty new to SQL so I don't know if this is a simple question. I have a table, and I am trying to add a column to the table and populate this column using what would be called an 'IF' function in Excel.

Basically 'column A' has numbers in it. I want SQL to look at 'column A' and if the first 5 digits of the number in 'column A' are 00001, then put 'description A' into new column 'column B'. If the first 5 digits of the number in 'column A' are 00002, then put 'description B' into 'column A' etc.

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