Generate Identity Field On Existing Table
May 11, 2004
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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Feb 25, 2007
I need sql script that can generate 'Create Table' definition including primary and foreign constraints for the table already existing in SQL server 2000.
Please do not refer me to the utilities or commercial software, I need only the sql script.
thanks
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Jul 9, 2006
While I have learned a lot from this thread I am still basically confused about the issues involved.
.I wanted to INSERT a record in a parent table, get the Identity back and use it in a child table. Seems simple.
To my knowledge, mine would be the only process running that would update these tables. I was told that there is no guarantee, because the OLEDB provider could write the second destination row before the first, that the proper parent-child relationship would be generated as expected. It was recommended that I create my own variable in memory to hold the Identity value and use that in my SSIS package.
1. A simple example SSIS .dts example illustrating the approach of using a variable for identity would be helpful.
2. Suppose I actually had two processes updating these tables, running at the same time. Then it seems the "variable" method will also have its problems. Is there a final solution other than locking the tables involved prior to updating them or doing something crazy like using a GUID for the primary key!
3. We have done the type of parent-child inserts I originally described from t-sql for years without any apparent problems. (Maybe we were just lucky.) Is the entire issue simply a t-sql one or does SSIS add a layer of complexity beyond t-sql that needs to be addressed?
TIA,
Barkingdog
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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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Jun 30, 2006
I want to insert a new record into a table with an Identity field and return the new Identify field value back to the data stream (for later insertion as a foreign key in another table).
What is the most direct way to do this in SSIS?
TIA,
barkingdog
P.S. Or should I pass the identity value back in a variable and not make it part of the data stream?
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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,
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?
Thanks in Advance
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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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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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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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Jun 10, 2015
how to add identity column into existing table in sql.
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Oct 13, 2005
hi
I have a field call: password, I want to generates some random chars as
default password for users (so user got something to login, and update
later).
Current Solution I have:
I made myself a trigger and it does generate password on insert, but
the problem with that is I have to allow NULL on that field. I
don't want NULL to be allowed, and if I don't allow null... sql server
won't allow me to insert a record (when leaving password field empty).
Reason i don't wanna allow NULL on that field, is because there may be
more applicaions using the same field from the same database.
Just in case if the other developer gets sloopy, I don't want other
application(s) allow user put to enter a null or leave it blank on my
password field.
My question is:
1) can I put a function or some sort at the "Default" field under "Design Table", if so...how?
2) any suggestions for a better implementation?
3) if (1) doesn't work, what other options would you suggest other then the current trigger i'm using?
TIA
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Jan 13, 2005
I want to add a computed field to an existing SQL table:
where Field1 is >0 and field2 is not null
set newfield = 'Y'
else set newfield = 'N'
I want to keep this existing table because I'm using it as the basis for an Access Report that is nearly complete.
BTW this table is the result of a DTS package that is comprised of several SQL executables so I need to be able to repeat this as part of a larger process.
Thanks!
sgreene
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Jan 17, 2006
Hi,
Is it possible to change any fieldname of an existing table?I mean to say
by TSQL statement.We know that we can alter the data type and width etc.
But I haven't got any info about filedname change.So if it is possible
Please help...
And Is there any TSQL command to alter multiple columns in a single statement?
Please help...
Thanks!!
Joydeep
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Jul 20, 2005
Can a new field be added to a table that already exists.Thanks in advance.
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Apr 25, 2007
Hi,
I have a table with 1000000 records i try to add a field with following`spec.
[mkey] [int] IDENTITY(1,1) NOT NULL
I get the following meassage:-
yearly' table
- Saving Definition Changes to tables with large amounts of data could take a considerable amount of time. While changes are being saved, table data will not be accessible.
Then I Have the following error:-
Time out error
- How is the best way to copy a large table from one to anther.
regards
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Feb 29, 2008
I have 2 tables - tblOrders and tblOrderDetails. Every time an order is placed, 2 INSERT statements are executed. The first one enters the general order and customer information in the tblOrders table:INSERT INTO tblOrders (custname, custdetails, orderdate) VALUES (@custname, @custdetails, @orderdate)The primary key in this table is OrderID which is an Identity column. This is the foreign key in the tblOrderDetails table.I'm trying to get the Identity value from the first INSERT statement to use in the second INSERT statement:INSERT INTO tblOrderDetails (orderid, productid, productcost) VALUES (@orderid, @productid, @productcost) How do i obtain this value and how would I supply it to the second INSERT statement?
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Nov 9, 2003
How can I alter a table turning ON or OFF an IDENTITY field ?
for example:
if I had my DB with Client_ID as an I IDENTITY field and for some reason it has
changed to just INT (with no IDENTITY) - how can I tell it to be IDENTITY field again ?
+
Does anyone knows an article on database planning ?
(I wanna know when should I use the IDENTITY field)
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Jan 4, 2006
Hello everyone,
I have a table X that has two columns (names have been changed to protect the guilty and innocent alike):
ID which is an identity column, and
Data which is a varchar.
I am trying to DTS data from a text file into this table. I want the identity column ID to auto-populate and each row of information from the file to be stored in the Data field.
I am creating the DTS package using the wizard in Enterprise Mgr. No matter what I try, I keep getting the following error:
Cannot insert the value NULL into column 'ID', table 'X'; column does not allow nulls. INSERT fails.
Any advice on what I need to do to get this working? It seems like such a simple thing and I'm getting very frustrated. :eek:
Thanks in advance.
Cathy
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Jul 20, 2005
Dear All,Suppose in the program a record is added to a table whoseprimary key is a identity field. If I really want to get the lastestvalue for that field after the insertion, is it the best way to useIDENT_CURRENT() to obtain this value?Thanks for your kind attentionYours faithfully,Benny
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May 8, 2012
I have a table which is already populated with data (Microsoft SQL 2008). I have now created a new column (int) which i want to populate with sequential numbers so that the new column created will serve let me know how many records exist in the table at a glance.
what SQL statement I need to write that will automatically polulate the newly created column with 1,2,,3,4,5 etc so that I can sort of number the records within the table.
I have 50000 records which I need to number and I really dont want to number the column manually via hand editing.
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Apr 6, 2007
Hello Members,
Is it fine to create the unique sequence number id using the int or uniqueidentifier field ?
I want to further generate the id sequence id like with that consisting of the table initials with id to differ from other id.
Like,i m having a table name of employee then it should have the
where it is primary key and also in other table where it is foreign key.
e001.........
or
e01...........
or
e1............
which gets differ from the other.
If i select the field which is alphanumeric like char or varchar then there's no autoincrement in id.
Is there any way for this solution.If anyone know then pls kindly reply me.
I think it can be solve with substring function but i don't have the exact idea how to use it...
I m using asp.net with C# 2005 and sql server 2005.
So,if possible then pls kindly give some solution which is related to C#.
Have already created the autogenerated id and stored in database.
I m using stored procedure for insert of the data.
Thanxs in advance for a reply..
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Jul 20, 2005
We are converting a legacy visual foxpro system to use a SQL back-end.A number of (existing DBF) tables currently have a zero-filled primarykey eg. '000255' which is just an auto-incrementing key - but alwaysstored as a char field with leading zeros.For backward compatibility we are considering retaining this primarykey and using an identity field to auto-generate the next value, thenconvert the new identity value into the new primary key. So ifidentity is 256 then the key field will be assigned '000256'.Now the problem with this is that the primary key must be non-null andunique so must be given a value in the INSERT statement. But, theidentity value isn't available (I presume) until after the INSERTstatement has executed.Is this a "don't go there" kind of problem?ThanksAndrew GrandisonSA Department of HealthAdelaide, South Australia
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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,
Can any body tell me that how we can attach IDENTITY property to an existing int column
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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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Sep 14, 2006
I have a table with an integer field (contains test values like 2, 7,8,9,12,..) that I want to convert to an Identity field. How can this be done in t-sql?
TIA,
Barkingdog
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Feb 26, 2008
I have met the interview question, I provide answer like the following from my experience. I don't know it is correct or need to supplement. Thank you for help.
Question: How to identity existing data for updating in SSIS?
Answer:
If you have the same key columns such as primary key or business key, you just use them to identify existing records from data source to destination.
If you use different key columns between data source and destination, you can create permanent link table which will store business key for data source and destination, and you can compare records from linking table when you update data.
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Apr 11, 2006
I have the following fields in table A:
GL_ID|GL_Name_VC| Amount |Period_TI|Year_SI|
===================================================
1000| Sales_HW| -20,000.00 | 01 | 2005
===================================================
1000| Sales_SW| -10,000.00 | 01 | 2005
===================================================
1001| Cost_HW | 5,000.00 | 01 | 2005
===================================================
1001| Cost_SW | 5,000.00 | 01 | 2005
the fields above have the following datatype:
Fields | Datatype
===================================
GL_ID | Integer
GL_Name_VC | Variable Character
Amount | Integer
Period_TI | TinyInteger
Year_SI | SmallInteger
The above database is running on Microsoft SQL Server 2000 and i would like to query
for a report that looks something as below:
Sales Category | Sales | Cost | Profit
=================================================
HW |-20,000.00 |5,000.00| -15,000.00
SW |-10,000.00 |5,000.00| -5,000.00
=================================================
Total |-30,000.00 |10,000.00|-20,000.00
The above report have 4 columns, with last column being a calculated field (Sales-Cost)
Guys, hope someone out there can help me with the sql command for the above report?
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Jul 20, 2005
I need to run a data report that will query an Access_Table that has thefollowing Project info:My Form has a command_button with the following code:Private Sub Command1_Click()Set db = New Connectiondb.CursorLocation = adUseClientdb.Open "PROVIDER=MSDataShape;DataPROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path &"Access_Table.mdb;"Set adoAge = New RecordsetadoAge.Open "SELECT CustomerName, OrderNo, Invoice_Date,IIf([Invoice_Date]<Now()-30 And[Invoice_DATE]>Now()-60,[Invoice_Amount],"") AS Greaterthan30,IIf([Invoice_Date]<Now()-60,[Invoice_Amount],"") AS Greaterthan60 FROMCust WHERE [Invoice_Date]< Now()-30", db, adOpenStatic, adLockOptimisticSet DataReport1.DataSource = adoAgeDataReport1.ShowEnd SubMy DataReport1 has the following RptTextbox:RptTextbox Datafield1 CustomerName2 OrderNo3 Invoice_Date4 Greaterthan305 Greaterthan60Problem arise when trying to display the above report that has an errormessage that says "Datafield Greaterthan30 not found"Is this an SQL Query limitation where Invoice_Date Datafield can only bequeried once & if we have more than one Datafieldwith the same fieldname (Invoice_Date) within the same Data report,thereport will fail to run? Should there be one moreNew Recordset to hold a second Datafield (Invoice_Date)?can anyone help? ThanksFrom:Cady Steldyn*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Aug 20, 2007
I have a table named PERSON and a field named PERSON_ID. How can I set this field to Autonumber? I know I have to use the IDENTITY command, but when I view this field in "design" view, all the IDENTITY options are grayed out.
How can I set this field with the IDENTITY properties?
Thanks
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Jan 24, 2008
Hi, guys,
I'm using MSSQL 2005, so I would like to know how to generate Serial no into database?
for example:
- serial no will be increase for each time confirmation has been done, The Serial no will insert into a new field as below:
00000001
00000002
00000003
and next...
thanks and regards
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Jul 21, 2006
I re-created a publication that was having problems and it gives this error when I start the snapshot agent from SQL Server Management Studio: I am stuck on how to resolve - any ideas?
"The publisher's identity range allocation entry could not be found in MSmerge_identity_range table. Transaction count after EXECUTE indicates that a commit or ROLLBACK TRANSACTION statement is missing. Previous Count = 1, current count = 2."
select * from MSmerge_identity_range returns 19 entries but I don't know how to fix.
I have tried deleting and re-creating but always get this error.
My other publications and subscriptions are working fine and I was able to create a new test publication that worked but can not get this one to work that worked fine up until today.
Any ideas?
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