hi guys,
just a question regarding database design
i have a table with an auto-generated primary key but the problem is this:
say i have 4 records,so logically they'll be numbered 1 to 4.so the problem is whenever i delete all records and add new ones,the numbering will start from 5 and not 1 again.
how do i remedy this?
thanx
Hey there :)I'm using Ruby on Rails to create a migration of a legacy database onan MS SQL Server. I'd like to name my constraints myself, such as'pk_authors', but in the cases where a table has an auto incrementedIDENTITY(1,1) id field, Rails takes over and adds the primary keyitself when creating the table.This is fine, except then the constraint gets a name like'PK__authors_384934' which is not very intuitive or easily remembered;)I'd like to just throw in an 'ALTER TABLE authors...' statement justafter that table has been created, but I'm not sure how to go aboutrenaming the auto generated constraint since the name it gets ispartially random. Is there any way to indirectly refer to theconstraint like 'RENAME PRIMARY KEY CONSTRAINT ON authors TOpk_authors' or something like that, so that I can rename theconstraint?Thanks in advance,Daniel Buus :)
View 9 Replies View RelatedHello,
I've a problem with auto-generated key. In my parent table, some lines have been deleted. I would like to add new lines with the same content in order to restore my database, but I cannot decide on the id value which is an auto-generated key. Is there a solution to set an auto-generated key with a specific value ?
Thank you in advance,
regards,
mathmax
Hello everyone,i have a web form to take user details.as soon as the submit button is clicked the form is submitting and the new row is being added into the sqldatabase.its fine ..but in the newly added row, i want the user id(primary key and auto generating) to display in different manner.in mytable column(userid),instead of userid auto displaying 1,2,3,4 ...i want it to display in this way.these are all primary keys of rows added.todaydate-username-1 eg(2.2.2008-jack-1)todaydate-usernaem-2 eg(2.2.2008-zak-2)todaydate-usernaem-3 eg(2.3.2008-leme-2)any idea how to achieve this.?thanks.jack.
View 9 Replies View RelatedI downloaded the AdventureWorks OLTP Schema and am trying to use some of the design concepts that are used in this example but I don€™t quite understand some things.
First there is a column named rowguid, at the moment I assume that this is a GUID. If this is wrong most likely my next question will make no sense.
Second if that is indeed a guid all the tables have another id; example would be Employee table would have employeeid and rowguid, why do this? My best guess is that you would use the guid to easily insert (linked/sync) data into multiple tables without needing to retrieve the id from the table that was first input into. My scenario would be inserting an employee; to insert an employee you need to create a row in the employee, contact and address tables and for ease you would use the guid to link these rows. But if this is the case wouldn€™t there be sync issues that would arise?
If my guess is totally off please correct me also if anyone can direct me to some good resources that cover database design.
The schema can be downloaded at http://www.microsoft.com/downloads/details.aspx?familyid=0F6E0BCF-A1B5-4760-8D79-67970F93D5FF&displaylang=en#filelist
Thanks for any help.
can i create Custom Auto-Generated Sequences with SQL Server like DD-0001,DD-0002,DD-0003...... to DD-000........
View 1 Replies View RelatedMy question: Is it okay to drop all the auto generated column statistics? (for the following scenario)
- I am cleaning up unnecessary objects (tables, unused indexes, overlapping statistics etc) from databases and found out there are more than 1400 auto generated column statistics on one database (lets call it A).
- Database A was used to be our reporting database but from last several years we are using database B for reporting. DB A has all the historical data while DB B only has valid records.
- We are updating all the column statistics with full scan nightly on database A and it is talking almost 2.5 hours to do that. Now I want to drop all the "unnecessary" statistics those were created when DB A was reporting database and they are no longer in use. There is no way to know the creation date of the column statistics that I know of. Statistics "last update date" is of no use because of our nightly job. So I was thinking of dropping all the auto generated column statistics and let the sql server create as it needs from now.
Ok, let's say that I do a following inline INSERT statement.....
INSERT INTO Car ( carMake, carModel ) VALUES ( 'Honda', 'S2000' )
When I do this, a carId int value will automatically be generated because it is the Car table's PK and is an int identity. How do I obtain this value so I can immediately use it in let's say, the following example.
INSERT INTO Person ( carId ) VALUES ( @carId ) ..... where @carId is the value I need
Maybe you would say I should do something like.....
SELECT carId FROM Car WHERE carMake = 'Honda' AND carModel = 'S2000'
However, let's assume that the carMake and the carModel fields are NOT unique. I'm sure there's an easy way to extract the new identity value (maybe even in the same query) as the INSERT, but I just don't know how.
Thanks.
We have implemented a very small reporting database which has a main table that started off small and has now grown to around half a million rows. Initially, there were no indexes on the table apart from a clustered index, but as the data has grown, performance has dropped and so we have added a number of indexes. This has resolved the performance issues.
Before creating the indexes SQL Server had auto created a number of statistic objects (_WA_Sys_000... etc). After creating the indexes, new statistic objects where created for the new indexes. In some cases, there are duplicate statistics (auto and index) for the same columns.Should I go through and drop the duplicate auto statistics? Will having duplicates cause issues at all?
Dear all,
I would like to use SSIS to populate product information from a remote database to a local one.
There are Product table (which contains the basic information) and ProductImage table(which contains the product images in binary).
I would like to use a join query
SELECT A.name, A.price, B.image from Product A INNER JOIN ProductImage B WHERE A.ProductImageID = B.ProductImageID
to return all the product information from the remote database.
When populating the local database, the local ProductImage table will be populated first and then the local Product table will be populated with the ProductName, ProductPrice return from the query together with the newly genetated ProductImageID afer insert a record into the local productimage table.
The ProductImageID column is set as the identity column in the ProductImage table.
I am very new to SSIS. Is there a way to handle this scenario? What components do I need to use?
Thanks
What's the proper way to delete an existing database through native c++ code?
When I try DeleteFile(filename), I get an error about another process using that file. I hadn't created a connection to that file in my own program, so I assume that lock is from the sql engine.
Thanks folks!
Hi,
I have recently been looking at a database and wondered if anyone can tell me what the advantages are supporting a unique collumn, which can essentially be seen as the primary key, with an identity seed integer primary key.
For example:
id [unique integer auto incremented primary key - not null],
ClientCode [unique index varchar - not null],
name [varchar null],
surname [varchar null]
isn't it just better to use ClientCode as the primary key straight of because when one references the above table, it can be done easier with the ClientCode since you dont have to do a lookup on the ClientCode everytime.
Regards
Mike
Hej There.We have a big problem. We have now for 4th years had a SQL Serverwithout problems. But sutnely some of the primary keys are deleted.The subdata to the primary keys are not deleted. This is a big problembecause This is a billing system. Recently there was over 300 primaykeys deleted. Good that we have backup but still... NOOOT goodCan anyone help me to solve this problem!!! PLEASEBest regardsDanni
View 1 Replies View Related
Hi Everybody,
Kindly let me know if there is a way of deleting data from primary table without deleting data from its corresponding foreign key table.
Thanks & Regards
Hello all,I'm using SS2K on W2k.I'v got a table say, humm, "Orders" with two fields in the PK:OrderDate and CustomerID. I would like to add an "ID" column whichwould be auto-increment (and would be the new PK). But, I would reallylike to have orders with the oldest OrderDate having the smallest IDnumber and, for a same OrderDate, I'd to have the smallest CustomerIDfirst. So my question is:How could I add an auto-increment column to a table and make it createits values in a particular order (sort by OrderDate then CustomerIDhere)?In the real situation, the table I want to modify has around 500krecords and the PK has 5 fields and I want to sort on three of them.Thanks for you helpYannick
View 7 Replies View RelatedHow do I make a Primary Key in a table automatically increment as a new row of data is entered? do i have to do it with a trigger?? if so what is the code behind it....what I have is a Applicant table, which holds the ApplicantID (<<<needs auto incremented), FirstName, LastName, Address, City, State, Zip, and PhoneNumber. I enter all the other information through visual web developer, and what I need to do when the hit submit on the form with the data i want to automatically set an id right there. any suggestions will help!
View 3 Replies View RelatedHi all,I have a table where I have my ProdPK set up as Primary key, turned on "Is Identity" and set the Identity increment to 1. But each time I add a new item, the number incremented by 2... I have couple of other tables and they are all fine, just this particular table increased twice as it should. I check the setting against other tables and everything seems to be the same. By the way, this is adding the data to the table inside MS SQL Server Management Studio manually. I haven't done anything in the ASP.NET page yet. Thank you very much,Kenny.
View 5 Replies View RelatedDear all,
I am using SQL express 2005 in visual studio 2008. I would like to use Form View to insert new record in the table. There is a column call "id". I think it is too stupid to let user enter a unique identifier instead of generating by the system.
I know how to generate a random integer number in a normal TextBox. However, when I edit the InsertItemTemplate, I cannot modified the value of that textbox. For example, i couldn't use "TextBox1.Text = temp;" here. How can I achieve to change this TextBox's value by the system that I would like to generate a random interger. Thanks a lot.
Regards,
Eric Chan
How do I make my Primary Key Auto Increment from Enterprise Manager?
Thanks
I discovered the cause:
in SQL Server Enterprise Manager, open up db tree, right click the table, go - 'design' and set 'Identity' to yes.
I can't for the life of me find out how to auto increment the primary key like you can in access. I want to use userIds that will auto increment as new users are added. Can you guys help me out at all?
As of now I used this code as an example. I'm using SQL server 2005
CREATE TABLE Customer
(SID integer PRIMARY KEY,
Last_Name varchar(30),
First_Name varchar(30));
I want a table to have an int auto primary key, that will fill in deleted rows.
EG
1
2
4
5
8
The next primary key should be 3 (NOT 9)
This table changes often, so just adding 1 to the last number used, will fast run out of numbers.
The table is accessed by many users, so it can not be manually generated.
I was just wondering on a very simple database table with lets say a primary key set to columb ID and another columb lets say products, can you make the primary key automaticly increment its self whenever a new entry has been put in?For instance say I have this table set up with ID Being the primary KEY, Columb 1 = ID( INT ), Columb 2 = Products ( VarChar(50) ), and have the fields ID = 1, and products = my product.....and if a user inserts a new record say from a gridview or some sort of data entry the second ID Feild will automaticly be 2 and the products gets updated per user input.......I'm very sorry but I'm having a hard time putting this into words for some reason..umm basicly user adds something into the products feild and the ID field automaticly increments one number higher from the last one?ThanksAdam.
View 4 Replies View RelatedOk - I have two tables that are relational. I have been inserted data into the tables because of testing. I also have been deleting data. My question is how do I reset the auto-incremented Primary key values.
For example:
Primary key of table one is bizID. Well there are only 3 record currently in the table. The bizIDs are 1-3. If I insert another record the bizID will be 88 because that was the next auto-incremented number. I obviously deleted the other records. I want to start the primary key value over from zero. How do I accomplish this? thnks
How to auto increment an alphanumeric Primary Key in SQL? :( Because I want to add something like this in the Primary Key, for example i'll add a new data with an alphanumeric value of ABC-0001, then I'll add another 1, and it auto increments to ABC-0002 and so on.. How can I do it? And if I'll add a new alpha character in the Primary Key field, for example DEF-0001, then I'll add another and it auto increments to 002, and so on, and it will go back to 0001 if i'll use another combination of alpha characters. for example, i'll add a new alpha character AAA, will it go back to 0001 or it will continue? T___T I hope u get my point.. I want my table to look like this if i have added the dataABC-0001ABC-0002DEF-0001DEF-0002AAA-0001then if il add a new 1, for example ABCit will auto increment to 0003 in the same field, it will look like this after addingABC-0001ABC-0002ABC-0003DEF-0001DEF-0002AAA-0001Will it be possible? :(
View 4 Replies View RelatedHello vmrocha,
Our records indicate that you have never posted to our site before. We hope you find the help you need.
If you need to make a post, we're always happy to help.
I'm still looking for a solution on msdn, but i've decided also to post my question here.
How can i reset my primary key field auto-increment back to 0 in runtime (or in designtime)?
The table I am using have a column called Key which is the primary key of the table and a auto number. This primary key is not a foreign key in any other table.
I need to write SQL to drop the current primary key and add a new one Say "RecordId"
as the new primary key and which should be a autonumber too.
any idea.
thanks in advance
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
View 5 Replies View Relatedi 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
View 1 Replies View RelatedWe have upgraded our SQL 2008 server to 2012 last month. i've noted since then that many tables that have auto increment primary key bigint field increases by 1 like it should, then for some reason it jumps up by 1000 or even 10000? i have seed adn auto increment set to 1 but doesnt effect it. Is there anything that could be causing the next value to jump that much?
View 18 Replies View RelatedHi. After inserting data (new row) by using DetailsView control, how to read auto incremented primary key (identity) of this new row from sql database to use it as parameter passed to stored procedure?
View 4 Replies View RelatedHi guys,I followed the ASP.net official tutorial to create a DAL & Business Logic Layer (http://www.asp.net/learn/dataaccess/tutorial02cs.aspx). I have a table with a int ID field. I wish to write a function to add a new entry into this table but have the ID field auto-increment.The ID field is set as the Identity Column and has a Identity Increment & Seed of "1". If I manually go to the table and insert a new record leaving the ID value null it automatically increments. But if I create a C# function to add a new entry I get an error saying that the ID field can't be Null. Is there any way to use the Update method as shown on line 14 below to add a new entry but with it automatically incrementing? I did create a function called InsertDevice that simply inserts the other fields using a SQL INSERT and it auto-increments fine, just wondering if there is a way to do it using the DataTable and the Update method? Thanks for any help!!! 1 public bool AddDevice(string make, string model)
2 {
3 //cannot have the same device entered twice!
4 if (Adapter.FillDeviceCountByMakeModel(make, model) == 1)
5 return false;
6
7 RepositoryDataSet.DevicesDataTable devices = new RepositoryDataSet.DevicesDataTable();
8 RepositoryDataSet.DevicesRow device = devices.NewDevicesRow();
9
10 device.make = make;
11 device.model = model;
12
13 devices.AddDevicesRow(device); << Error thrown Here!
14 int rows_affected = Adapter.Update(devices);
15
16 return rows_affected == 1;
17 }