what other method can you use to generate primary keys automatically. My boss disagrees with me using identity for the primary keys. He says it is not professional. I am working on SQL Server 2005 platform. Can anybody advice me?
View 3 RepliesI have a database in XML format , with 100+ tables, that I want to import into SQL server but the problem is that I don't have any of the original primary key information. I know that some of the tables had multiple primary keys.
Is there a method or a tool that is capable of determining the primary keys for me??
I don't want to have to figure it out by hand, especially if I have more of these databases in the future.
Hello group:I've done alot of reading on this subject somewhat and have found thatmany people have many different opinions on this subject. My questioncenters mainly around using a lookup table to enable users to select apre-defined list of values.I have developed a practice myself of avoiding AutoNumber type datafields for primary keys where the primary key will be related to achild table. Nevertheless, what do most users do with lookup tables?My thoughts are to create a small key value for each value in thelookup table. For example:I might have a Carriers table which shows a list of carriers that Imight ship an order by. One of the entries may be 'Air Freight -Overnight', or 'Air Freight - 2nd Day Air'. I've seen a few exampleswhere the primary key field for each entry like these would beautonumber, or at least, a numeric value. What I like to do is createmy own key, like for 'Air Freight - Overnight', I might use 'AFO' forthe key, and for 'Air Freight - 2nd Day Air', I might use 'AF2'. Anythoughts on this? Mine are that even tho the users may never see thisvalue - I, as the developer will see it and I tend to prefer a keyvalue based on real data that means something other than anauto-incremented number. In referencing the well-known Northwind.mdbdatabase, I noticed their Categories table used a number field value,like 1, 2, 3....etc, but their customers table used values like'ALFKI' to represent their key values.What are some other thoughts out there? I'm working with Accesscurrently, but this project is about to move to SQL Server.James
View 3 Replies View RelatedWe are facing the following issue, several machines/users that are executing very often a command similar to :
INSERT INTO TableName (FieldOne,FieldTwo) VALUES ('ValueOne','ValueTwo');
SELECT SCOPE_IDENTITY() AS Table_ID;
Where TableName has a primary key defined as identity(1,1).and that Table_ID is being used as reference in others tables
These queries are executed using different dababase users and among several diffrent apps..The Problem is that we are detecting lost block of "Table_ID's" as the other tables shows the InsertedID as a reference, but the TableName table lacks of this ID record. In other words, the INSERT seems to work, the SCOPE_Identity returns an InsertedID, and the other tables are populated using this number. However, when we query the TableName table the mentioned record does not exist. We are profiling the server and we're sure that there are no DELETE statement on the TableName table. This seems to be happening when the are either deadlocks or blocked processes. Whenever the deadlocks and locks disappear/solved, everything works as expected.why the Scope_Identity returns the Inserted ID if the INSERT action had failed.
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
How can i enter Default Values of " " to all the columns of type characterof all the tables (excluding system tables) and Default Values of 0of all columns of type numbers. Excluding all primary key columns.Thank you
View 1 Replies View RelatedHello again,
I'm going through my tables and rewriting them so that I can create relationship-based constraints and create foreign keys among my tables. I didn't have a problem with a few of the tables but I seem to have come across a slightly confusing hiccup.
Here's the query for my Classes table:
Code:
CREATE TABLE Classes
(
class_id
INT
IDENTITY
PRIMARY KEY
NOT NULL,
teacher_id
INT
NOT NULL,
class_title
VARCHAR(50)
NOT NULL,
class_grade
SMALLINT
NOT NULL
DEFAULT 6,
class_tardies
SMALLINT
NOT NULL
DEFAULT 0,
class_absences
SMALLINT
NOT NULL
DEFAULT 0,
CONSTRAINT Teacher_instructs_ClassFKIndex1 FOREIGN KEY (teacher_id)
REFERENCES Users (user_id)
)
This statement runs without problems and I Create the relationship with my Users table just fine, having renamed it to teacher_id. I have a 1:n relationship between users and tables AND an n:m relationship because a user can be a student or a teacher, the difference is one field, user_type, which denotes what type of user a person is. In any case, the relationship that's 1:n from users to classes is that of the teacher instructing the class. The problem exists when I run my query for the intermediary table between the class and the gradebook:
Code:
CREATE TABLE Classes_have_Grades
(
class_id
INT
PRIMARY KEY
NOT NULL,
teacher_id
INT
NOT NULL,
grade_id
INT
NOT NULL,
CONSTRAINT Grades_for_ClassesFKIndex1 FOREIGN KEY (grade_id)
REFERENCES Grades (grade_id),
CONSTRAINT Classes_have_gradesFKIndex2 FOREIGN KEY (class_id, teacher_id)
REFERENCES Classes (class_id, teacher_id)
)
Query Analyzer spits out: Quote: Originally Posted by Query Analyzer There are no primary or candidate keys in the referenced table 'Classes' that match the referencing column list in the foreign key 'Classes_have_gradesFKIndex2'. Now, I know in SQL Server 2000 you can only have one primary key. Does that mean I can have a multi-columned Primary key (which is in fact what I would like) or does that mean that just one field can be a primary key and that a table can have only the one primary key?
In addition, what is a "candidate" key? Will making the other fields "Candidate" keys solve my problem?
Thank you for your assistance.
what the best practice is for creating indexes on columns that are foreign keys to the primary keys of other tables. For example:
[Schools] [Students]
---------------- -----------------
| SchoolId PK|<-. | StudentId PK|
| SchoolName | '--| SchoolId |
---------------- | StudentName |
-----------------
The foreign key above is as:
ALTER TABLE [Students] WITH CHECK ADD CONSTRAINT [FK_Students_Schools]
FOREIGN KEY([SchoolId]) REFERENCES [Schools] ([SchoolId])
What kind of index would ensure best performance for INSERTs/UPDATEs, so that SQL Server can most efficiently check the FK constraints? Would it be simply:
CREATE INDEX IX_Students_SchlId ON Students (SchoolId)
Or
CREATE INDEX IX_Students_SchlId ON Students (SchoolId, StudentId)
In other words, what's best practice for adding an index which best supports a Foreign Key constraint?
Pls let me know How I generate script for All primary keys and foreign keys in a table. Thereafter that can be used to add primary keys and foreign keys in another databse with same structure.
Also how I script default and other constraints of a table?
Can somebody explain to me how to best do inserts where you have primary keys and foreign keys.l'm battling.
Is there an article on primary keys/Pk ?
CREATE TABLE [dbo].[tblProve](
[ID][varchar](50)NOT NULL,
[tempCountrys][varchar](100) NULL,
CONSTRAINT [PK_tblProve] PRIMARY KEY CLUSTERED
([ID] ASC) WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO
I have a table "dbo.tblProve" that have a Primery Key ID of type
varchar(10) and this primary key have a Default value or Binding like this:
([dbo].[fnc_ProveNewID]())
This function "dbo.fnc_ProveNewID()" finds the max(ID) in the same table and creates the next ID.
When I insert a record into the table dbo.tblProve the function creates the new ID automatically (this is the format of the ID '0000000001' or '000000010' etc. ). But when I insert a lot of records from a Select Query it displays this message below:
Msg 2627, Level 14, State 1, Line 2
Violation of PRIMARY KEY constraint 'PK_tblProve'. Cannot insert duplicate key in object 'dbo.tblProve'.
The statement has been terminated.
Is there any way to create a new ID into a table automatically without to be inserted by the user or client?.
i using a bound data grid which is using a stored proc. The stored proc needs the ClientID "if logged in" there is no form or control on the page outside of the loginstatus. I am wanting to pass the Membership.GetUser.ProviderUserKey.ToString() to the asp:parameter but I cant get it to work.So How do I pass a variable to a stored proc parameter using a bound data grid.I this its very strange that this cant be dont and there are a raft of reason why you wold want to do this with out the need to pass it to a form control.please helpjim
View 2 Replies View RelatedHi ,
I will need some examples in assigning and getting values using SQLServer 2005. For eg. How can I store the value that I retrieved in a variable and return that value ? How can I use a function inside a stored procedure ? Do we have any examples or some simple sample code just to take a look ?
For eg I have written the following function which I called from a stored procedure.
BEGIN
--Declare the return variable here
DECLARE @Rows NUMERIC(10)
DECLARE @RETURN_ENABLED VARCHAR(1)
-- Add the T-SQL statements to compute the return value here
SELECT @Rows = MAX(PROFILE_INDEX) FROM PROFILE_PERMISSION PP
INNER JOIN sys_menu_item ON PP.MENU_ITEM=sys_menu_item.menu_item
WHERE PP.PROFILE_INDEX in (select up.profile_index from user_profile up where up.user_id= @is_user) and
not exists (select up.profile_index from user_profile up where up.user_id= @is_user and up.profile_index=1) and
PP.APPLICATION_CODE = @is_appl AND
PP.MENU_NAME=@menu_name
Group By Profile_INdex
IF @Rows > 0
SELECT @RETURN_ENABLED = 'N'
ELSE
SELECT @RETURN_ENABLED = 'Y';
-- Return the result of the function
RETURN @RETURN_ENABLED;
END
Is it correct ? The variable @ROWS will be assigned with the values that the sql statement will return ?
From the stored procedure I'm calling the function inside a CTE.
;WITH GetHierarchy (item_text ,orden , read_order, item_parent , menu_item , enabled)
AS
(--Anchor.
select tb1.item_text, tb1.orden, tb1.read_order, tb1.item_parent , tb1.menu_item ,
dbo.f_sty_print_menu_per_role_per_app2(@menu_name , @is_user , @is_appl) as enabled
From sys_menu_item as tb1
where tb1.MENU_ITEM not in ('m_window','m_help','m_toolbar') and tb1.item_parent not in ('m_toolbar','m_window','m_help')
And tb1.item_parent= @menu_name
--Members
UNION ALL
select tb2.item_text, tb2.orden, tb2.read_order, tb2.item_parent , tb2.menu_item ,
dbo.f_sty_print_menu_per_role_per_app2(@menu_name , @is_user , @is_appl) as enabled
from sys_menu_item as tb2 , GetHierarchy
where tb2.MENU_ITEM not in ('m_window','m_help','m_toolbar') and tb2.item_parent not in ('m_toolbar','m_window','m_help')
And tb2.item_parent = GetHierarchy.menu_item and tb2.menu_name = @menu_name
)
select Space(5*(orden)) + item_text as menui, orden, read_order, item_parent , menu_item ,enabled
From GetHierarchy
Am I doing it correctly ?
I would appreciated any help you could give me.
Thank you
I have variables and values stored in a table in this format
process_id | t_variable | t_value
-----------------------------------------------------
1 | Remote_Log_Server | AUSCPSQL01
...
many such rows
how to assign values to variables in SSIS?
basically i'm looking for SQL equivalent of the following query i currently use to assign values to multiple variables (in a single query)
SELECT
@varRemoteLogServer=MAX(CASE WHEN [t_variable] = 'Remote_Log_Server' THEN [t_value] END)
,@varVariable2=MAX(CASE WHEN [t_variable] = 'variable2_name' THEN [t_value] END)
FROM Ref_Table
WHERE process_id=1
"Violation of PRIMARY KEY of restriction 'PK_Approve_Overtime'. The overlapping key cannot be inserted in object 'Dbo.Approve_Overtime'. The statement was ended."
can soemone explain to me why i have this kind of error?
i have this two tables. approve_overtime table has a primary key id_no and application_input table with a primary key of id_no!
all the values from of application_input will be stored also in approve_overtime.
sometimes the datas can be stored.sometimes it cannot and produces an error!
what do u think?
hmmm pls help!
Using SQL Svr 7.0. It appears that primary keys are created as nonclustered
unique indexes. Is there a configuration setting I can use to make them be
created as clustered unique indexes?
If a table has a column defined as Int, Identity(1,1) which is to be used as the primary key, should that index be defined as clustered or non-clustered? In Enterprise manager when you create a PK on a table it defaults to being a clustered index. I am sure the answer depends on the other index requirements and columns in the table but I'd like to see what other ppl think about this.
Thanks!
I have read that SQL Server tables can't have more than one primary key. I know in Access two keys are allowed. Why can't there be two primary keys in a single table in SQL Server 7.
Thanks
Hi everyone,
Does someone knows how can I drop a primary key (that I don't know the name) from a table in one sql statement.
Thanks,
Fady
HI ,
I accidently removed the primary keys from my table by mistake. Is there anyway ,That i can get the PK's back to what is used to be. Need Help pls...... When I try "resetting" the PK I kep getting this error:
'table_name' table
- Unable to create index 'PK_tablename'.
ODBC error: [Microsoft][ODBC SQL Server Driver][SQL Server]CREATE UNIQUE INDEX terminated because a duplicate key was found for index ID 1. Most significant primary key is '1'.
[Microsoft][ODBC SQL Server Driver][SQL Server]Could not create constraint. See previous errors.
[Microsoft][ODBC SQL Server Driver][SQL Server]Warning: The table 'tDetail' has been created but its maximum row size (12521) exceeds the maximum number of bytes per row (8060). INSERT or UPDATE of a row in this table will fail if the resulting row length exceeds 8060 bytes.
[Microsoft][ODBC SQL Server Driver][SQL Server]The statement has been terminated.
In access you can have two fields that are primary keys with one or the other repeating as long as the combination is not repeated.
i.e.
key1 key2
200410 12345
200410 12346
200410 12588
etc for all 200410 there can not be a repeat of any value of key 2
is there a way to have this dual key in MSSQL :confused:
Hi
How can 2 columns be clubbed together to form a primary key , i mean I have 2 columns job & Batch , need to club them together to form the primary key
How is it done I mean in the design , how to define that both the columns togethter form a primary key ,
Cause when I go to the table , it allows me to create a PK through the EM only for one column
Please help
Hi there,
is there any way I can use INSERT so if I try to copy duplicate primary key data, it automatically skips the task and moves on to the next data?
I have declared a table with a single column to be a Primary key. If I write 2 records, the first comprsing "A" and the second "a" then I get an exception about violating the uniqueness of the key. Is there a way that I can define the key to be case sensitive.
Many thanks
I have two tables with similar primary keys, table a and table b, and I want to find out all the key values that are disimilar between the tables. Can this be done with a select? if so what would it be.
View 5 Replies View RelatedI 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?
Hi all,
I need some help regarding a conversion in a Script Task.
I am reading my variable values from a database with a sql task, the table has two columns, variable and variableValue.
Looping through the recordset and setting the different variables works well, with two links:
http://blogs.conchango.com/jamiethomson/archive/2005/02/09/SSIS_3A00_-Writing-to-a-variable-from-a-script-task.aspx
http://sqlblog.com/blogs/andy_leonard/archive/2007/10/14/ssis-design-pattern-read-a-dataset-from-variable-in-a-script-task.aspx
setting the variable value only works well if the package variable is defined as string, because the db field is a varchar, trying to assign an integer for example brings up an error.
Therefor I tried something like CType:
Dts.Variables("MyVar").Value = CType(MyRecordsetField,String), where the target datatype should be depending on the variable datatype instead of being assigned as a constant.
Could someone give me a hint to handle this?
Thanks in advice!
Cheers
Markus
I am not entirly sure what a forigen key is, is it a unique ID which is the same as the primary key? If adding a foreign key to a table that already has data, will it update each row with a unique ID or will it only create a unique ID on newly inserted records (for the foreign key)? If the foreign key is the same as the primary key then why do we need to even add a foreign key at all?For example a table like: Table Name : Customers--CustomerID uniqueidentity (primary Key)--FirstName nchar Table Name : Orders --OrderID int--CustomerID int Obviuously CustomerID are going to be the same in both tables, so why would you need to add a foreign key on 'CustomerID' to the 'Order' table, can't SQL match the customerID in each table any way? Cheers
View 3 Replies View RelatedHiI have a database and I been inserting some dummy data into it but now I want to upload it to my website but I want to delete all the dummy data and start the PK back at 1. I truancted all the data but it still keeps counting from the last one.So how do I reset it?
View 6 Replies View RelatedHi,
I have a question on pk?
I have a db which has tables which do not have pk?I want to create Pk on each one of them - infact,I want to alter the table , add one more field and make it the pk .
My question is - do I will have to go to each table,alter it and then create the pk on it or do someone have any script or better way to do it?
Any help is appreciated.
Hi,
Just a continuation to my earlier queries on replication.
I have a db which I want to replicate - it do not have pk?
I do not want to create pk on existing columns - so I thought of creating one more column in all the tables and make them pk .
Any one has any idea if this will work fine or may give any problem which I should be prepare for.
Any thought appreciated -
pvd
I have a 3rd party app which had a primary key with about 5 fields. The last field of this was a trantype. This app had a posting process which uses this in it's sql. Ran rather slow. We added an individual index to this field and cut processing down 90%. It almost seemded like sl server was ignoring this index. Is this because it was the last field in the primary key index?
View 1 Replies View RelatedHi All,
I`m using BCP to import ASCII data text into a table that already has many records. BCP failed because of `Duplicate primary key`.
Now, is there any way using BCP to know precisely which record whose primary key caused that `violation of inserting duplicate key`.
I already used the option -O to output error to a `error.log`, but it doesn`t help much, because that error log contains the same error message mentioned above without telling me exactly which record so that I can pull that `duplicate record` out of my import data file.
TIA and you have a great day.
David Nguyen.