Updating Data In Foreign Key Relationships
Aug 1, 2006
Hey guys this is a SQL Server 2005, .net 2.0 question.
I got 3 tables: Job, Times, Employee. The times table is related to Job and Employee by foreign keys. The Times table is pretty much a table where the employee's time logs are kept for a specific job. Since there was a M:M relationship between Job - Employee, I decided to create a Times table in between, and the primary key of this table should actually be the PK of Job and the PK Employee, but I couldn't figure out how to make a PK consisting of two fields.
Anyhow, my main question is: How to assign an Employee to a specific job in .net? In other words, what's the best way of retrieving the Job_id and Emp_id and sticking them in the Times table? I was doing a form with a drop down for Emp_id and Job_id, but I don't know how to do the inserts... I'm confused and would appreciate any help.
THANKS!
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Feb 21, 2005
How do I move data from one server and append to the same table structure on a second server and preserve the foreign key relationships. In other words TableB.TableA_ID references TableA.ID. The IDENTITY ID numbers themselves will change but they must continue to match up on the destination server the way they did on the source server.
I can do this using procedural programming but that is usually not the way to go.
(btw, this is a cleaned up version of a question I tacked on to another thread)
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May 10, 2007
I've always created database tables with one Primary Key that increments by one for each new record. I'm working on a database that was built by someone else now that has a lot of defined foreign key relationships (under Tables > specific table > Keys). How helpful is it to define these Keys? I assume it helps make the database more efficient but is it necessary if you're working with small databases?
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Apr 12, 2008
I working a tutorial where I will learn a lot of new stuff, LINQ being one of them. As a part of this tutorial, there are four tables and foreign keys. My db skills were limited to simple tables and i've nevr done anything where I related tables before. I'm a bit confused about foreign keys and how to set them up. I think I'm setting up right, but I have a doubt. I have a couple of screen caps to show you what where my doubt comes from at:
http://www.noelakins.com/keys.htmlWhat is causing my confusion is that the connecting lines between the Albums and Events table diagrams in my setup seems to point back to the Photos table, and the Photos table seems to point to the Tags table. From the tutorial, the connecting lines seem to be pointing the other direction. Am I setting up the key right, or do I have them backwards? I'm setting out to learn a lot of stuff in this tutorial, so when I mess it up, i would like to know that it isn't because the foreign keys are wrong.EDIT:After doing some googling and some reading and watching, I'm a little less confused about how to set up foreign keys, at least how to do it in VWD. My problem now seems to be understanding the relationships. In the tutorial example, the Tags table has a FK on the PhotoID field, which matches the primary key (PhotoID) in the Photos table. Now, does this mean that the Tags table is the parent table and the Photos table the child? If this is true, then the other two tables must be child tables of the Photos table. At least that how I think this should work. The issue that I'm having with this is trying to understand how a cascade delete would work. Is the foreign key relationship a one way or both way relationship? For example, if I have made a foreign key on the AlbumID field of the Photos table, where the primary key table is Albums, PK is AlbumID and the foreign key table is Photos, then, if I do a cascade delete of a particular photo, does it delete the album too? That wouldn't make sense. Foreign keys and cascade deletes must be one way, right? Thanks
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Feb 5, 2007
Hi,
I'm using SQL Server 2005 Management Studio. I've created several Foreign Key Relationships using Database Diagrams. Now I'm trying to edit the constraints on the relationships, but when I right click on the relationship, the only option available is "Delete Relationships from Database". But I am not able to edit the relationship. Does anyone know how to do this?
Thanks for the help.
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Mar 3, 2008
Hi,
I have 2 tables Publication and Advertisment_Codes. I want to update the publication_code in both tables where country_id=1 and publication_code='A'. However, it gives me an error because of foreign key relationship. I tried first updating in Advertisment_Codes and then in Publication table but it didn't work. I tried the other way round but also it didn't work.
How can I update the publication code?
Thanks
CREATE TABLE [dbo].[Advertisment_Codes](
[Advertising_Code] [nvarchar](20) NOT NULL,
[Country_id] [int] NOT NULL CONSTRAINT [DF_Advertisment_Codes_Country_id] DEFAULT ((0)),
[Publication_code] [nvarchar](20) NULL,
[Advert_type] [nchar](1) NULL,
[Date_Entered] [datetime] NULL,
[User_Id_Ent] [int] NULL CONSTRAINT [DF_Advertisment_Codes_User_Id_Ent] DEFAULT ((0)),
[Date_Updated] [datetime] NULL,
[User_Id_Upd] [int] NULL CONSTRAINT [DF_Advertisment_Codes_User_Id_Upd] DEFAULT ((0)),
[Default_Code] [bit] NULL CONSTRAINT [DF_Advertisment_Codes_Default_Code] DEFAULT ((0)),
[Active] [bit] NULL CONSTRAINT [DF_Advertisment_Codes_Active] DEFAULT ((0)),
CONSTRAINT [PK_Advertisment_Codes_1] PRIMARY KEY CLUSTERED
(
[Advertising_Code] ASC,
[Country_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Advertisment_Codes] WITH CHECK ADD CONSTRAINT [FK_Advertisment_Codes_Countries] FOREIGN KEY([Country_id])
REFERENCES [dbo].[Countries] ([Country_id])
GO
ALTER TABLE [dbo].[Advertisment_Codes] CHECK CONSTRAINT [FK_Advertisment_Codes_Countries]
GO
ALTER TABLE [dbo].[Advertisment_Codes] WITH CHECK ADD CONSTRAINT [FK_Advertisment_Codes_Publications] FOREIGN KEY([Country_id], [Publication_code])
REFERENCES [dbo].[Publications] ([Country_id], [Publication_code])
GO
ALTER TABLE [dbo].[Advertisment_Codes] CHECK CONSTRAINT [FK_Advertisment_Codes_Publications]
CREATE TABLE [dbo].[Publications](
[Country_id] [int] NOT NULL,
[Publication_code] [nvarchar](20) NOT NULL,
[Publication_name] [nvarchar](50) NOT NULL,
[Media_type] [int] NOT NULL CONSTRAINT [DF_Puclications_Media_type] DEFAULT ((0)),
[Date_Entered] [datetime] NULL,
[User_Id_Ent] [int] NULL CONSTRAINT [DF_Publications_User_Id_Ent] DEFAULT ((0)),
[Date_Updated] [datetime] NULL,
[User_Id_Upd] [int] NULL CONSTRAINT [DF_Publications_User_Id_Upd] DEFAULT ((0)),
CONSTRAINT [PK_Puclications] PRIMARY KEY CLUSTERED
(
[Country_id] ASC,
[Publication_code] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Publications] WITH CHECK ADD CONSTRAINT [FK_Publications_Countries] FOREIGN KEY([Country_id])
REFERENCES [dbo].[Countries] ([Country_id])
GO
ALTER TABLE [dbo].[Publications] CHECK CONSTRAINT [FK_Publications_Countries]
Whisky-my beloved dog who died suddenly on the 29/06/06-I miss u so much.
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Nov 5, 2007
Guys,
I have 600 tables in my database, out of which 40 tables are look up value tables. I want generate truncate scripts which truncates all the tables in order of Parent child relationship excluding lookup tables. Is there any way to do this apart from figuring out Parent Child relationship and then writing the truncate statements for each of the table.
For example
EmployeeDetail table references Employee table
DepartmentDetail table references Department table
Department table references Employee table
My truncate script should be
TRUNCATE TABLE DEPARTMENTDETAIL
TRUNCATE TABLE EMPLOYEEDETAIL
TRUNCATE TABLE DEPARTMENT
TRUNCATE TABLE EMPLOYEE
IS there any automated way to figure out parent and child tables and generate truncate script for the same.
Thanks
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May 15, 2008
I cannot find a good way to view existing Foreigh Key Relationships in SQL Server Management Studio Express. In the Object Explorer, if you click on a table to expand it, you can see a tree view of EVERYTHING about the table (Columns, Keys, Contraints, Triggers, Indexes, Statistics), but NOTHING about Foreign Key Relationships!!
The only way I have found is that you have to open the table in Design mode, then right click, and choose Relationships, and only then can you see what FK Relationships are defined.
You should be able to see the FK Rletaionships in the tree view of the Object Explorer window!
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Jul 18, 2006
Here is the alter statement that I am trying to use to create a relationship between 2 tables. This does not seem to work on mobile. What am I doing wrong?
ALTER TABLE [SubCategory] CONSTRAINT [FK_SubCategory_Category] FOREIGN KEY([CategoryID])
REFERENCES [Category] ([CategoryID])
ON UPDATE CASCADE
ON DELETE CASCADE
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Jul 6, 2007
Hi,
I received the error below upon saving when I was trying to create a foreign key in a table using relationships in "table designer" of sql server 2005 management studio. This process has been successful for other tables. What might be the problem?
Thanks
Code Snippet
- Unable to create relationship 'FK_SAMPLE_GRID'.
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_SAMPLE_GRID". The conflict occurred in database "acquire", table "dbo.GRID", column 'GRIDNAME'.
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Aug 4, 2015
I have taken on a contract to improve reporting for an old HR database that was developed using FoxPro (Visual FoxPro, I think) with the data stored in SQL Server 2000. There are no foreign keys in SQL Server 2000 so the relationships are maintained inside FoxPro.Is there a way of extracting the relationships from the FoxPro code and generate foreign keys in SQL Server, so that I can do proper design?
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Apr 11, 2006
Hello 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.
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Dec 13, 2005
I am brand new to SQL Server 2000 and have encountered an issue. I created a DB with 5 or so tables all of which contain different client information. All tables are related via the Client_ID primary key I set in my main table, and foreign key in all the subsequent tables. Im using a Microsoft Access Project form as the front end.
Im having trouble figuring out how to populate the subsequent tables with the Client_ID after a enter the data in the Main table where the primary key resides.
Do I create a trigger or a stored procedure...am i even in the ballpark?
thanks in advance.
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Sep 27, 2006
Hi,
I have a datatable with the following values:
ID
CompanyID
CompanyName.
Here ID is the foreign key. I was wondering if there was a way to update tables with foreign keys. Searching for stuff gave me something like update cascade. Can somebody please elaborate on that?
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May 21, 2008
I am in the process of building a fact table in a staging area. The data in the host system has numerous composite keys, so I have replaced all the composite keys in the dimensions with surrogate keys (integer) which are generated using an identity at load time. When I load the staging (fact) table, I have set the default value of all the foreign keys to 0. What I must do now is update all the foreign key values with the surrogate key values from the dimensions. I'm using an update command and the original gid values from the source system in the where clause...i.e.
UPDATE X
SET x.key_1 = y.key_1
FROM TableA X WITH (NOLOCK)
INNER JOIN TableB Y WITH (NOLOCK)
ON x.org_id = y.org_id
AND x.bus_id = y.bus_id
AND x.prov_gid = y.prov_gid
AND x.log_gid = y.loc_gid;
This seems to work fine for most tables. However, I am now trying to update a table that has over 10 million rows and approximately 30 foreign keys. The script runs for hours. I ususally stop it after about 8 hours when it still hasn't completed. Since the keys are dynamic and they could possibly change during each load process, I can't add them during the load process.
Is there a better way to update these keys. I need to regenerate the fact tables every night and taking this much time to reload a fact table is just not practicle. I've indexed the alternate keys on all the dimensions and have also indexed the gids on the target fact table. Am I doing something wrong? Have I over indexed the target table? Please help! Thanks Jerry
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Nov 10, 2006
Hi
I am trying to update tables "Table A" & " TableB" with a new value for a particular column1. Now "TableA" contains a foreign key "FK1" defined on it and is referencing another table "Table B" containing the similar column "Column1"
Because of this constraint I was not able to update TableA and TableB. My question is
1) If i wanted to go ahead with this update, what are the possible ways?
2) If only solution is to drop the constraint. Then How do i know the definition for this particular Foreign key, i mean it may refer some columns in Table B. I wanted to know the complete definition of it so that i can rebuild the constraint after the update. Right now i can see only the constraint name when i use sp_help TableA. But how do i know the complete reference made by this foreign key.
Early reply is much appreciated
Thanks!
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Jul 22, 2007
Hi,
I have a dimension called 'Caller Type' with the following attributes:
CallerTypeKey ---- surrogate key
CallerTypeID
CallerTypeDesc
CreatedByKey ---- foreign surrogate key from User Dimension
I used Script Task to get the last used key and increment it so i can use it for new records in my dimension. however, my dimension is linked to a User Dimension and I need the surrogate key of that once I insert the new record to CallerType Dimension.
How would I do that?
cherriesh
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Aug 25, 2004
Hello!
I have a "current" table which users update on a daily basis, it holds forecast data. This table is designed to only hold 7 days of data and is therfore always rolling over by date.
What I want to do is have a procedure that copies this "Current" table to a "History" table every day so the historical information is stored. The copy is simple, but how do I check for and over ride values that are already in the "history" table with the newest values from the "current" table because the "current" values have the possibility of changing a few times while the forecast is updated. I can define a primary key but am not sure how to check for and update the necessary values?
Any help??
Many thanks!
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Feb 7, 2007
Hi all,
In my project i will have the data in a collection of objects, I need to update series of tables with foreign key relations
Right now my code looks like this
foreach(object obj in Objects){
int accountId=Account.Insert(obj.accountOpenDate,obj.accountName);//this will update the accounts table and returns account id which is a Identity column in Acccounts table
int DebtId=Debt.Insert(accountd,obj.debtamount,obj.debtbalance); this will update the Debts table and returns DebtId
///series of tables like above but all the relevant data comes from obj and in the Insert Methods i am using stored procedures to Insert the data into table
}
The no of objects varies from 1000 to 1 milliion,, with this approach its taking more time to update all the data. Please let me know if any alternative procedure to handle this kind of scenario.
Thanks
Regards
Prasad.
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Sep 21, 2006
I am very new to SQL Server 2005. I have created a package to load data from a flat delimited file to a database table. The initial load has worked. However, in the future, I will have flat files used to update the table. Some of the records will need to be inserted and some will need to update existing rows. I am trying to do this from SSIS. However, I am very lost as to how to do this.
Any suggestions?
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Jun 4, 2007
Hello Everyone,
I'm new here. Could anyone explain to me about alternative way to backup the databases excluding the Backup Data process. I find a way by export and import data from DTS. But somehow it doen't copy the relationships and the keys. Could anyone clarify this. Thanks
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Nov 17, 2006
Hi,
I am trying to setup Trans Replication with updating subscriber on sql2000. One column on few tables got data with single quote (').
How do I handle in this case? Did any one come across such case?
Can I Change default QUOTED IDENTIFIER from ' (single quote) to something else (@@@) on SQL2000?
If yes, how to do?
Thanks
mka
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May 26, 2008
Hi,
How do I delete data which is a Foreign Key in another table?
For example;
string query = "DELETE * from user_details WHERE user_ID = '" +userID.Text+ "';
The user_ID is the Primary Key in the user_details table and also a Foreign Key in other tables.
Thank you. (:
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Feb 17, 2006
How do I go about inserting records on a table that has a PK/FK relationship with another table?? I get a foreign key error everytime I try :)
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Jul 23, 2005
This is a rather abstract question about data design, but I ask it herebecause a) the database is SQL Server, and b) you're such a learnedbunch!Let's assume the classic relation of Customers and Orders, where anOrder may reference a single Customer. If I was designing such arelation from scratch, I would create the Customer table with anIdentity column and call it CustomerID. The Order table would containa column called CustomerID, a foreign key to the Customer table.So far, so unexceptional. However, in my current project I have towork with legacy data that comes from a number of old Access systemswhere the data was not normalised. I wish to normalise it.The main table in this new system contains reports on parts. Eachreport may reference a single part. However, the old data which I haveto import allowed the user to type in the part number. This has led todirty data (for example, '40-7889-9098' appears, as does '40-7889-9098') so I will clean this data up. In the application, the partnumber will be selected from a drop down list, though the administratorwill have access to a builder to add, amend or delete part numbers.So, my report table needs to store a reference to a part. When Iimport the data into my SQL Report table, I will initially bring acrossthe part number. I will then populate the Part Numbers table with alldiscrete, distinct part numbers from the Report table. My question isshould I then create a PartNumberID column in both tables, and "backpopulate" the Report table with the PartNumberID which corresponds withthe matching PartNumber - e.g.UPDATERSETR.fldPartNumberID = PN.fldPartNumberIDFROMtblReports RINNER JOIN tblPartNumbers RNON R.fldPartNumber = RN.fldPartNumberI could then drop the fldPartNumber from the tblReports table.My question is - should I bother? Or can I just leave the actualPartNumber in the Reports table, and leave the tblPartNumbers tablewith a single column which is both Primary key and Foreign key?Sorry if this is poorly expressed - I had a tough weekend!Edward--The reading group's reading group:http://www.bookgroup.org.uk
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Oct 5, 2007
I have 4 tables I am pulling data from. Table A and B can be joined and Table C and D can be joined via foreign keys but A and/or B can not be Joined to C and/or D via foreign Key.
My statement basically looks like this to start
SELECT s.HTENANT, s.HPROP, s.HUNIT, s.SHEADNAME3B, s.DTOT7I
FROM H8summ S join tenant t on s.htenant = t.hmyperson
And returns this :
29226 128 20577 Almukhtar, Khadijah M 4242.00
26574 128 17980 Archie, Mary 20218.00
The last number is the key it is the income.
In another table we have an income limit table setup that would have the low, medium and high settings for the range.
For instance it may have 11400 as the elimit attribute and say 22000 as the vlimit attribute.
Then in the fourth table we the description that can be linked back to the income limit table via the hinclimit attribute. In this case the desc attribute would be ELI for elimit and VLI for vlimit.
So I want to take the income compare it to the income limit table and then return the description
The output would look like this :
29226 128 20577 Almukhtar, Khadijah M 4242.00 eli
26574 128 17980 Archie, Mary 20218.00 vli
I just not sure how to reference the income limit table without the foreign key in the from statement. When I just add it it returns 6 rows for each person (number of rows on the income limit table)
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Nov 17, 2013
Our SQL 2008 R2 relational database has tables with foreign key relationships for part numbers. We receive production data from a separate program and we need to import the CSV data into our database application.
The problem is our separate program creates a CSV file with the actual part number "362S162-33". In our database we have a separate parts table (example: 362S162-33 has identity "15").
We need to import data into a production table that has a "part number" (FK) column.
How can we, when importing, cross-reference the "parts table" to convert the part number to the identity number. We have thousands of parts, so we need this change of part number column to the FK identity automatically on import.
Production Table:
idComponent (PK), [1000]
ComponentName, [Assembly108]
idPartNumber (FK), [15]
ComponentLength, [230.5]
UserMessage, [Assembly is 230.5 inches using 362S162-33]
Qty; [1]
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Oct 3, 2007
I've imported data from an Excel spreadsheet to a table that has fields to match the destination table I'm trying to populate. The destination table has an Insert trigger with several checks on certain fields to make sure they have corresponding records in other tables.
If I do a statement like
"INSERT INTO destinationTable
(
ItemId,
Product,
SuperID,
etc etc
)
SELECT * FROM oldtable"
it runs for a while then gives me error messages from the trigger and rolls back the Insert.
The trigger has code such as
"IF (SELECT COUNT(*) FROM inserted WHERE ((inserted.Product Is Not Null))) != (SELECT COUNT(*) FROM tblInProduct, inserted WHERE (tblInProduct.Product = inserted.Product))
BEGIN
(Error message code goes here)
END"
So, do I need to do an INNER JOIN to each of the related files?
When I try that, I get this error:
"Msg 121, Level 15, State 1, Line 2
The select list for the INSERT statement contains more items than the insert list. The number of SELECT values must match the number of INSERT columns."
Is SQL counting the foreign key fields as separate fields, or what?
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Oct 31, 2015
Is there anyway to get the order in which data to be import on to tables when they have primary and Foreign Key relations?
For ex:We have around 170 tables and when tries to insert data it will throw error stating table25 data should be inserted first when we insert data in table 25 it say 70 like that.
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Nov 11, 2015
Am working on sql database table shifting to new database tables. Am getting the following error while truncating the tables:-
Cannot truncate table 'orderItem' because it is being referenced by a FOREIGN KEY constraint.How can i remove all the items in the table if i found this error.
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Apr 22, 2015
I have to load data into destination table, it has foreign key relation to two different tables called person table and organization table . sample data to be loaded is like
person_id organization_id
1 Null
2 NULL
Null 1
null null
person table and organization table doesn't have null values in them, when I try to load this data none of them are laoded, I know either person_id or organization id having null value is failing foreign key constraint. But I want to transfer all the rows except the ones having both nulls. how this can be achieved ?
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Apr 20, 2015
Should we have foreign key relationship between two slowly changing dimensions?
Most of the cases we talked about are about how to build an SLC, any example of trying to have two SLCs with FK relationship in a snow flake schema?
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Nov 14, 2006
Hi,
I have a new problem when I import data from an xml source file in two destination tables. The two tables are linked by a foreign key... for example :
table MOTHER (MOTHER_ID, MOTHER_NAME)
table CHILD (CHILD_ID, MOTHER_ID, MOTHER_NAME)
After a lot of transformations data are inserted into MOTHER table and I want to insert other fields of the data flow in CHILD table. To do this, I need the MOTHER_ID field that is auto incremented in MOTHER table.
My problem is to chain the insertion in CHILD table after the insertion in MOTHER table to be sure that the relative row in MOTHER table is really inserted. I haven't find any solution to chain another transformation task after my flow destination "Insert into MOTHER table".
The only solution I have found is to create a new flow control to insert data in CHILD table, using a lookup transformation task to bind with MOTHER table... But with this solution all my flow control transforms are made two times...
Is there a solution to chain two insertions with a foreign key constraint in a data flow?
Thanks
Regards,
Arnaud Gervais.
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