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?
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
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.
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
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 ?
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
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 VøyenliEDB-konsulent asNORWAY
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
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 .
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
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!!!!
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
Hello -- Following normal practice, I have an autoincrementing identity column designated as primary key in my table. I have two other columns that should also contain unique values per record, but the Identity option is greyed out (in Management Studio) for all columns other than the primary key. 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
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.?
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?
Hi Friends, I have a existing table named as activity, and have the column like ID,Description. I want to add the Identity for the ID column using script only.. Have any ideas how to do in sql query analyser?
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.
I normalized the below tables but I am finding it difficult to copy data to the new tables. Â 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) Â BUYER(Buyer,Department)
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.
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.
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.
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?
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.
I have a table for blog comments I want to add a column that counts the number of comments for each article. existing table looks like this: CommentID ArticleID (FK) commentAuthor authorEmail comment commentDate (getDate()) I would like to add a column that counts the number of total comments for each article.This will give me what I want using the VS query tool: "SELECT COUNT(comment) AS Expr1 FROM UserComments WHERE (articleid = @articleid)" But can I add that to the table somehow so it does it automagically???
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.
