Multiple Foreign Keys On Same Field, Based On Other Field

Jul 23, 2005

I have a table called BidItem which has another table called
BidAddendum related to it by foreign key. I have another table called
BidFolder which is related to both BidItem and BidAddendum, based on a
column called RefId and one called Type, i.e. type 1 is a relationship
to BidItem and type 2 is a relationship to BidAddendum.

Is there any way to specify a foreign key that will allow for the
different types indicating which table the relationship should exist
on? Or do I have to have two separate tables with identical columns
(and remove the type column) ?? I would prefer not to have multiple
identical tables.

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Multiple Records Tied To Foreign Key Field?

Jun 6, 2008

I'm a total newb to SQL so I apologize if I butcher the description of what I'm looking to do :) Hopefully the example makes more sense. Is it possible for a single record in 1 table to contain relationships to several records in a different table?

What I've got so far is 2 tables - Hardware and Software, with ID Specifying primary keys HardwareID and SoftwareID respectively. the hardware records are for computer details and the software obviously are for programs. What I need to be able to do is pull up a hardware record and be able to see what software is installed on it, and vice versa pull up a software record to see which computers it's installed on. The problem I'm running into is that a computer can have multiple programs installed on it and a program can be installed on multiple computers, so I don't know how to create that relationship to account for that.

What I'd like to see is in the Hardware table a column for SoftwareID that has a foreign key relationship to the SoftwareID field in the Software Table, and vice versa....My question though is is that possible to do and have potentially multiple separate records it links to from that same column field? I might have a computer with say Windows XP Pro, Office 2003 Standard, Adobe Acrobat 8 and a proprietary rate calculator program that i need each to be displayed with their details when I open that computer's record. Or on the software side if I need to see which computers a license is already installed on then I want to make sure I can pull up the full list of computers.

And finally if what I'd like to do isn't possible as I described it...any recommendations for a better way?

Thanks all for the help!

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SQL - Foreign Key With References Of Multiple Tables With Same Primary Key Field

Apr 9, 2007

I want to create a table withmember id(primary key for Students,faculty and staff [Tables])and now i want to create issues[Tables] with foreign key as member idbut in references i could not able to pass on reference as orcondition for students, faculty and staff.Thank You,Chirag

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May 31, 2006

I have developed an ASP.NET form with 12 different fields that will allow end users the cability to query 3 tables that are relational to one another.

I was curious what is the best way to perform this in a Stored Procedure?

Can I use a UNION -- Not sure if this is the best choice

or account for evey kind of WHERE clause based off IF statements on the data that is passed through the parameters?

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Jul 20, 2005

I know there has to be a way to do this, but I've gone brain dead. Thescenario..a varchar field in a table contains a date range (i.e. June 1,2004 - June 15, 2004 or September 1, 2004 - September 30, 2004 or...). Theusers have decided thats a bad way to do this (!) so they want to split thatfield into two new fields. Everything before the space/dash ( -) goes intoa 'FromDate' field, everything after the dash/space goes into the 'ToDate'field. I've played around with STRING commands, but haven't stumbled on ityet. Any help at all would be appreciated! DTS?

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Nov 18, 2007

Hellow Folks.
Here is the Original Data in my single SQL 2005 Table:
Department:                                            Sells:
1                                                              Meat
1                                                              Rice
1                                                              Orange
2                                                              Orange
2                                                              Apple
3                                                             Pears
The Data I would like read separated by Semi-colon:
Department:                                            Sells:
1                                                             Meat;Rice;Orange
2                                                             Orange;Apple
3                                                             Pears
I would like to read my data via SP or VStudio 2005 Page . Any help will be appreciated. Thanks..
 
 

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Multiple Foreign Keys

Jun 25, 2004

What are the possible issues I could run in to having multiple foreign keys in a table. Here is why I ask. I have a db (sql server) that has a participant table, a forum table, and a forum reply table. Every record in the forum reply table is associated with the forum table via a PK-FK relationship w/cascading updates/deletes. The participants who post in these tables are not tied back to the participant table via a PK-FK relationship w/cascading updates/deletes. Should they be?

The problem I ran in to is that one particpant was deleted from the participant table but a post with their partid still existed in the forum or forum reply tables.

My feeling is that anytime a participant is deleted, everything that pertains to them should go too, right? If I am right, what do I have to be careful of if I do that?

Let me know! Thanks!!

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Multiple Foreign Keys

Nov 20, 2004

I am constructing a db in sql server 2000 that will score cross-country running meets. I have an individual results table that needs to only contain participants that are entered as participants but are specific to a certain race as well. Can I have this table be linked back to TWO other tables via the PK-FK relationship and what issues might I have doing that?

Thanks!

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Multiple Foreign Keys

Dec 30, 2004

I am having trouble creating multiple foreign keys on a table so that I can set up cascading update and cascading delete from two different primary tables. I am using the diagram to do this but when I try to save the diagram I get the following error.



ODBC error: [Microsoft][ODBC SQL Server Driver][SQL Server]ALTER TABLE statement conflicted with COLUMN FOREIGN KEY constraint 'FK_IndResults_RaceData'. The conflict occurred in database 'VIRA', table 'RaceData', column 'RaceID'.



What would cause this to happen? Is it possible that I have records in the foreign table that do not transfer back to the primary table?

Thanks!

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Sep 30, 2015

I need formulating a view through which I can create a an output like below image -

Monthly Table

NUM STATUS ACTIVITYCODE

HAX603 Completed 0x45845a
HAX317 Completed 0x112z44
HAX465 Completed 0x1155x4
HAX523 Completed 0x124c69

Season Table

NUM STARTMONTH STARTDAY ENDMONTH EMDDAY

HAX603 JULY 1 OCTOBER 31
HAX317 DECEMBER 1 DECEMBER 31
HAX317 MARCH 1 MARCH 31
HAX317 July 1 July 28

[Code] ...

Final Output 

NUM STATUS ACTIVITYCODE <SEASONS>

HAX603 Completed 0x45845a 1 JULY - 31 OCTOBER, 1 DECEMBER - 31 DECEMBER
HAX317 Completed 0x112z44 1 DECEMBER - 31 DECEMBER, 1 MARCH - 31 MARCH, 1 July - 30 July
HAX465 Completed 0x1155x4 1 MARCH - 31 MARCH, 1 July - 28 July, 1 August - 30 August
HAX523 Completed 0x124c69 1 November - 30 November

I have written a query to join the values of multiple field, but lacking in as how will I formulate a view which will check for the duplicate values of Num fields and merge there values in a single field like season.

select num, (CAST(startday AS VARCHAR(3)) + ' ' +  startmonth + ' - ' + CAST(endday AS VARCHAR(3)) + ' ' +  endmonth)AS Season from seasons;

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Jul 23, 2005

Hi All,I'm trying to solve this for a few days now and I just can't figure itout...I have three tables set up, I'll simplify them for this question:Table 1: HOTELSColumns: HOTEL_ID, HOTEL_NAMEExmple row: 123 || 'Hotel X'Table 2: SERVICESColumns: SERVICE_ID, SERVICE_NAMEExample rows:1 || 'Breakfast in bed'2 || 'King size bed'Table 3: LINK_HOTELS_SERVICESColumns: FK_HOTEL_ID, FK_SERVICE_ID, SERVICE_VALUEExample rows:123 || 1 || 1123 || 2 || 1In table 3 I link different services to different hotels. In the same tableI set the "value" for the service.The first example row of table 3 means something like: Hotel X offersBreakfast in bed. In this case 1 stands for TRUEThe second example row of table 3 means: Hotel X offers King size beds(again: 1 stands for TRUE).What I'm struggling with is selecting the hotel ID's which offer multipleservices. To stay in the example: how can I select all hotels whereSERVICE_ID = 1 AND SERVICE_ID = 1. I can't seem to figure out how to doit...I hope anyone can help... Thanks a lot in advance!!!Robert

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Jul 23, 2005

Hey,I am having some confusion about how to formulate this particularquery.I have 2 tables. Table A has 4 columns say a1,a2,a3,a4 with thecolumns a1,a2,a4 forming the primary key. Table B again has 3 columnswith b1,b2,b3,b4 and like before, b1,b2 and b4 form the primary key.All columns are of the same datatype in both tables. Now I want to getrows from table A which are not present in table B. Whats the best wayof doing this?Thanks--Posted using the http://www.dbforumz.com interface, at author's requestArticles individually checked for conformance to usenet standardsTopic URL: http://www.dbforumz.com/General-Dis...pict235166.htmlVisit Topic URL to contact author (reg. req'd). Report abuse: http://www.dbforumz.com/eform.php?p=815725

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Apr 4, 2008

Newbie question. Can someone show me an SQL statement that sorts the results of a query by a field in a different table?

CREATE TABLE `Table1`
(
`table1_id` INTEGER AUTO_INCREMENT ,
`table1_name` VARCHAR(255),
PRIMARY KEY (`table1_id`)
)

CREATE TABLE `Table2`
(
`table2_id` INTEGER AUTO_INCREMENT ,
`table2_name` VARCHAR(255),
`table2_table1` INTEGER,
PRIMARY KEY (`table2_id`)
)

ALTER TABLE `Table2` ADD FOREIGN KEY (`table2_table1`) REFERENCES `Table1`(`table1_id`);

What I'd like is something like:

SELECT * FROM Table2 ORDER BY "Table1(table2_table1).tabel1_name",table2_name

It's the section in double quotes that I can't figure out how to compose.

As an example, if Table 1 has
1, A
2, B
3, C

and Table 2 has
1, a, 2
2, b, 1
3, c, 2

then I'd like the sort to return
2, b, 1
1, a, 2
3, c, 2


TIA,

Stephen

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Jul 26, 2007

is there a way to cascade update to foreign keys where both fields (PK & FK) are located in two different database?

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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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Jul 16, 2014

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?

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Apr 17, 2007

Here's a portion of the current statement.

UPDATE EngagementAuditAreas

SET numDeterminationLevelTypeId = parent.numDeterminationLevelTypeId,

numInherentRiskID = parent.numInherentRiskID,

numControlRiskID = parent.numControlRiskID,

numCombinedRiskID = parent.numCombinedRiskID,

numApproachTypeId = parent.numApproachTypeId,

bInherentRiskIsAffirmed = 0,

bControlRiskIsAffirmed = 0,

bCombinedRiskIsAffirmed = 0,

bApproachTypeIsAffirmed = 0,

bCommentsIsAffirmed = 0

FROM EngagementAuditAreas WITH(NOLOCK) ...

And what I need is to conditionalize the values of the "IsAffirmed" fields by looking at their corresponding "num" fields. Something like this (which doesn't work).

UPDATE EngagementAuditAreas

SET numDeterminationLevelTypeId = parent.numDeterminationLevelTypeId,

numInherentRiskID = parent.numInherentRiskID,

numControlRiskID = parent.numControlRiskID,

numCombinedRiskID = parent.numCombinedRiskID,

numApproachTypeId = parent.numApproachTypeId,

bInherentRiskIsAffirmed = (numInherentRiskID IS NULL),

bControlRiskIsAffirmed = (numControlRiskID IS NULL),

bCombinedRiskIsAffirmed = (numCombinedRiskID IS NULL),

bApproachTypeIsAffirmed = (numApproachTypeID IS NULL),

bCommentsIsAffirmed = (parent.txtComments IS NULL)

FROM EngagementAuditAreas WITH(NOLOCK)

Thanks.

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Jul 20, 2005

There are two tables, parent and child table.Foreign key field of the child table is not a required field. If thedata is submitted w/o a value into the foreign key field, what shouldI make it as a default value? Should it be "null"?

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May 17, 2007

Hello,



I have two tables (one-to-many relation) related thru a common key. I have setup the Relation using the Database Designer. The Form is populated using Drag-and-drop which automatically adds the BindingSource, TableAdapter, and Binding Navigator. The Relation works great in the change mode, and life is good.



In the Add mode the field setup with the Foreign Key is not automatically populated as it is in Change mode. The field can be updated manually, but that defeats the purpose of setting up the Relation.



Any ideas how to fix this?



I know this is difficult to visualize without seeing it.



Thank you for any ideas,

Tom

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Apr 10, 2015

How can i find the primary field name and primary table name of a given foreign key.

For example

Table A:
IDa
Column1
Column2
Column3

Table B:
IDb
column1
column2
column3 <---- this is foreign key to table A's IDa

What i want to do is i pass input of tableB, column3 and i get name of Primary tableA and field name IDa. How is it possible to do in tsql ?

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Oct 12, 2012

I ran into an interesting situation.  I'm working on contract and was looking at creating an ERD for an existing database when I ran into a problem.  I found FK's that are referencing columns that do not have a unique constraint or a unique index. 

I don't know the history of the database but was there a time in SQL Server history where this would have been possible?  I scripted out the tables and created it in a test database.  When I run the script to create the FK I get the following message. 

I double checked the original tables and this FK does exist in table1 and there is no unique anything in the referenced table, table2.  Currently the database is running on SQL Server 2008 Ent.

ALTER TABLE [dbo].[table1] WITH CHECK ADD CONSTRAINT [FK_table1] FOREIGN KEY([Col1])
REFERENCES [dbo].[table2] ([col2])

There are no primary or candidate keys in the referenced table 'dbo.table2' that match the referencing column list in the foreign key 'FK_table1'.

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Feb 12, 2008

Using SQL Server Express 2005, I have two databases.  AppDB - The main application database.GeoDB - A somewhat static ZIP code / states / other geographic stuff databaseI need to have some foreign key columns in tables in AppDB reference columns in the GeoDB database tables.  Eventually other application database besides AppDB will be doing the same thing in our infrastructure. After googling and reading for days, here is what I
think I know:You cannot create foreign keys that reference tables in another database in SQL Server.You
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2005 supports multiple schemas within the same database.  Maybe I should logically separate my databases this way?  Seems like it would be a tough solution to manage since I already have some databases live in production that will eventually use this 'static' GeoDB.  Also, seems like it
wouldn't be as portable as keeping the GeoDB info in its own database,
but maybe I'm being too software engineer-ish here - afraid of low
cohesion, high coupling.I will greatly appreciate any advice I can get, or any more options I am missing.  Thanks,Adam Nofsingerucnmedia.com

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Aug 25, 2015

I'm new to SQL and I'm trying to write a statement to satisfy the following:

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May 4, 2006

Good morning...

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Actually i find just "datetime" format but give me the format 21/01/2000 01:01:20.

How to do for having date and time in two different field.

Sorry for my english....

Cordially

A newbie

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Nov 22, 2007

Hello!I have a table A with fields id,startdate and other fields. id and startdateare in the primary key.In the table B I want to introduce a Foreign key to field id of table A.Is this possible? If yes, which kind of key I have to build in table A?Thx in advance,Fritz

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Oct 10, 2005

Hey all.

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So, if field A is more then 2 characters, return that row.

Thanks
Caden

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Apr 18, 2008

Hi All,

For one of my reports, I need a expression smthing like this.


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Thanks

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May 29, 2008



I have a report. I want to display title according to the following combination of two parameter values.









Line of Business
Product Type
Report Title

Total
Line, Loan
13 Month Home Equity Portfolio - Total

Cbank
Line, Loan
13 Month Regional Bank Portfolio - Total

DTC
Line, Loan
13 Month Direct to Consumer Portfolio - Total

Edirect
Line, Loan
13 Month Equity Direct Portfolio - Total

InstLend
Line, Loan
13 Month Institutional Lending Portfolio - Total

Total
Line
13 Month Home Equity Portfolio - Lines

Cbank
Line
13 Month Regional Bank Portfolio - Lines

etc

Line of Business and product type are two parameters.
Product type is a muliple parameter. i.e you can select Line, Loand or Line and Loan.

can any one tell me how to write a proceedure to get this result(i.e report title)

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Mar 30, 2007

I am trying to create a report using Reporting Services.

My problem right now is that the way the table is constructed, I am trying to pull 3 seperate values i.e. One is the number of Hours, One is the type of work, and the 3rd is the Grade, out of one column and place them in 3 seperate columns in the report.

I can currently get one value but how to get the information I need to be able to use in my reports.

So far what I've been working with SQL Reporting Services 2005 I love it and have made several reports, but this one has got me stumped.

Any help would be appreciated.



Thanks.



I might not have made my problem quite clear enough. My table has one column labeled value. The value in that table is linked through an ID field to another table where the ID's are broken down to one ID =Number of Hours, One ID = Grade and One ID= type of work.

What I'm trying to do is when using these ID's and seperate the value related to those ID's into 3 seperate columns in a query for using in Reporting Services to create the report

As you can see, I'm attempting to change the name of the same column 3 times to reflect the correct information and then link them all to the person, where one person might have several entries in the other fields.

As you can see I can change the names individually in queries and pull the information seperately, it's when roll them altogether is where I'm running into my problem

Thanks for the suggestions that were made, I apoligize for not making the problem clearer.

Here is a copy of what I'm attempting to accomplish. I didn't have it with me last night when posting.



--Pulls the Service Opportunity

SELECT cs.value AS "Service Opportunity"

FROM Cstudent cs

INNER JOIN cattribute ca ON ca.attributeid = cs.attributeid

WHERE ca.name = 'Service Opportunity'



--Pulls the Number of Hours

SELECT cs.value AS 'Number of Hours'

FROM Cstudent cs

INNER JOIN cattribute ca ON ca.attributeid =cs.attributeid

WHERE ca.name ='Num of Hours'



--Pulls the Person Grade Level

SELECT cs.value AS 'Grade'

FROM Cstudent cs

INNER JOIN cattribute ca ON ca.attributeid =cs.attributeid

WHERE ca.name ='Grade'



--Pulls the Person Number, First and Last Name and Grade Level

SELECT s.personnumber, s.lastname, s.firstname, cs.value as "Grade"

FROM student s

INNER JOIN cperson cs ON cs.personid = s.personid

INNER JOIN cattribute ca ON ca.attributeid = cs.attributeid

WHERE cs.value =(SELECT cs.value AS 'Grade'

WHERE ca.attributeid = cs.attributeid AND ca.name='Grade')

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Dec 28, 2006

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@ClientID Int,
@PmtAmt Money
IF @PmtAmt >= tblSettings.TopAmt THEN
Update tblClients
SET
ClientStatus='High'
WHERE ClientID=@ClientID
ELSE
Update tblClients
SET
ClientStatus='Medium'
WHERE ClientID=@ClientID
ENDIF
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May 20, 2008

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Table1- the primary key table has the following columns
ContentID - int identity field
DateAdded- datetime
Table2 - The foreign key table, has the following relevant fields
FK - int foreign key
version - int
When an initial record is added there is a record added to each table.  The ContentID in Table1 will match the FK field in Table2.  Then a user will be able to "edit" the record in Table2, but instead of writing over the record that is already there, a new record will be added to Table2.  I would like to calculate the version field where each time a record is added for the particular ContentID/FK it adds 1 to the last version that was added to that particular ContentID/FK. 
 Does that make sense.  I am trying to implement some type of revision tracking for my CMS that I am building and this is the only way I can come up with because my client is worried that somebody will go in and make incorrect changes to their site and  they want to be able to roll it back to a previous version. 
I would appreciate any ideas.
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laura

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May 29, 2008

Hi I hop i make sense with this, i have a page where you can update a products price based on the year, so for instance some products will still have prices set in 2007, while some may have prices which will be set in 2008, what i am trying to do is if the price has been set in 2008 it shows this value. The fields in the table which control the values are Rate(controls 2007), and Rate2007Period2. What i am trying to do is if Rate2007Period2 is null or 0, then display the 2007 rate, and if Rate2007Period2 is greater than 0 then display that value. Here is the view which displays the rates;
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Nov 9, 2005

Here's a question for the SQL gurus out there:
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8060
8060,4450
8060,4123,3245
Now I need to structure a query to return these values from this single field as three fields CODE1, CODE2, CODE3, with NULL as appropriate for example
CODE1=8060, CODE2=4450, CODE3=NULL.
I have been using CASE along with CHARINDEX and PATINDEX but it it becoming extremely messy. Can anyone think of a "neater" way to return three fields from this one field?
Any help very greatly appreciated.
Thanks, Simon.

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