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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Jul 23, 2005
I have a table called BidItem which has another table calledBidAddendum related to it by foreign key. I have another table calledBidFolder which is related to both BidItem and BidAddendum, based on acolumn called RefId and one called Type, i.e. type 1 is a relationshipto BidItem and type 2 is a relationship to BidAddendum.Is there any way to specify a foreign key that will allow for thedifferent types indicating which table the relationship should existon? Or do I have to have two separate tables with identical columns(and remove the type column) ?? I would prefer not to have multipleidentical tables.
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Aug 29, 2006
I am needing to take data from one data set that consists of a list of parts and their stock information. Then I am needing to show any transactions that the individual parts may have had during the time that user defined through the filters.
This requires me to have two data sets since I can't do a join between the stocking information and the transactions due to the fact that it is very possible that every part won't have a transaction for each month of each year. Doing a left join still filters down the data too much so thus the need for two data sets.
I have these parameters:
Vendor, Year, Month, Type of request
Vendor and Type of Request is handled through StockInfoDataset. I then need to update the table showing 0 or transaction amount from TransactionDataset filtered by the ItemNumber and WarehouseCode that is in StockInfoDataset. Since it seems List and Table only allow one dataset in them, I am at a loss as to how I would go about doing this.
Explaining this is quite difficult in a forum post, but hopefully someone would be able to shine some light on possibly avenues to follow here....thank you in advance.
Josh
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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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Oct 27, 2007
Table 1
stock
stock_id
cat_id
stock_name
is_fund
Table 2
Fund_contents
fund_id
stock_id
I need to find out all the stock_id's from the stock table that are associated with 2 different fund_id's in the second table and the stock_id's in the first table have to have is_fund = 0 from the stock table
any ideas?
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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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Feb 7, 2007
Someone please help!. I am trying to create a view in SQL Server 2000 to use for a report but I am having problems with concatenating multiple values into one field. In my example below I am trying to list all records in my queried table in columnA then concatenate a list of all other records that share the same value in column B of the queried table into another field. If there are no other matches for a row in columnA then I would leave the corresponding field in columnB blank. Thanks in advance.
TABLE
ColumnAColumnB
1.......A
2.......B
3.......C
4.......A
5.......A
6.......B
7.......C
8.......D
9.......C
10......E
EXPECTED OUTPUT
ColumnA ColumnB
1.......4,5
2.......6
3.......7
4.......1,5
5.......1, 4
6.......2
7.......3
8.......
9.......3,7
10......
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May 30, 2008
Quick question. What I'm trying to do is concatenate a field for multiple records (hope that is worded in an understandable manner). Here's an example:
ID.....Code
5......33
5......23
ID.....Code...Result
5......33.....33 23
5......23.....33 23
I need the code to get the Result field. I know the code if you were to find the sum, min, max, etc...
(SELECT SUM(CODE)
FROM Table
WHERE ID = Table.ID) AS Result
But I don't know how to write it so it will combine strings.
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Jul 23, 2005
Dear all,I need to update one field in a table for a given record and visit number.Example below is how the table looks -SID VISIT DLCO101 0 12101 1 16102 0 18102 2 10103 1 12103 2 14Here is how I would like it to look. The changes are the starred items.SID VISIT DLCO101 0 14*101 1 16102 0 18102 2 16*103 1 12*103 2 14I know it is an UPDATE statement, but I am not sure how to use it when Ineed to update more than one record.Thanks for the help in advance.Jeff
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May 4, 2006
Is there a way to create one field from multiple records using sql.For exampleTable 1John 18Peter 18David 18Now I want an sql query that when executed will return a field thatlooks like thisQuery1John Peter DavidSo basically it will return one record with all the name in one field
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Apr 22, 2006
I'm new to MS SQL and VB. I have a table with one field JOB_NAME containing 20 records. Out of that field I want to retrieve 6 of the 20 records into a pulldown menu. They are all unique text names like so:
Anna Smith
John Doe
etc. I did not see IDs listed for any of the names in the table when I looked.
There is no common denominator to the names that can be filtered in the SELECT statement, and the 6 that I want will need to be pulled out individually.
Is there a way to do this with a SELECT statement? I have not found much information about how to extract unique records out of a single field. Here's the statement I'm using which pulls all of them:
strSQL = "SELECT DISTINCT JOB_NAME AS Names FROM [WORKER_NAMES] WHERE JOB_NAME<>' ' ORDER BY JOB_NAME ASC"
This gives me the total list but I only want to bring back 6 of the 20 for the pulldown.
Is there a way to modify this statement to pull only the records that I want?
Thanks for any help you can give.
AJ
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Feb 15, 2012
I have a table JOBCODE which contains a list of codes.
I want to insert these values into table VIEWS as a list separated by spaces.
E.G.
Table Jobcodes looks like this
code
1
2
3
4
5
6
And I want table Views to look like this:
field1
1 2 3 4 5 6
How do I go about this?
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Oct 5, 2015
I have a requirement where I have the following separate tables:
Table A:
FldA FldB
34
35
43
53
54
55
64
74
75
Table B:
FldC FldD
1Break Begin
2Break End
3Out
4In
5Dept
Desired Result:
FldA FldD
3 In;Dept
4 Out
5 Out;In;Dept
6 In
7 In;Dept
I have played around with the newly discovered 'for xml path' but I can't quite seem to get the sql syntax right.
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Mar 20, 2014
writing the query for the following, I need to collapse the continuity. If the termdate for an ID is one day less than the effdate of the next id (for the same ID) i need to collapse the records. See below example .....how should i write the query which will give me the desired output. i.e., get min(effdate) and max(termdate) if termdate is one day less than the effdate of next record.
ID effdate termdate
556868 1999-01-01 1999-06-30
556868 1999-07-01 1999-10-31
556869 2002-10-01 2004-01-31
556872 1999-02-01 2000-08-31
556872 2000-11-01 2004-01-31
556872 2004-02-01 2004-02-29
output should be ......
ID effdate termdate
556868 1999-01-01 1999-10-31
556869 2002-10-01 2004-01-31
556872 1999-02-01 2000-08-31
556872 2000-11-01 2004-02-29
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Sep 13, 2006
Ok, I'm really new at this, but I am looking for a way to automatically insert new records into tables. I have one primary table with a primary key id that is automatically generated on insert and 3 other tables that have foreign keys pointing to the primary key. Is there a way to automatically create new records in the foreign tables that will have the new id? Would this be a job for a trigger, stored procedure? I admit I haven't studied up on those yet--I am learning things as I need them. Thanks.
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Feb 12, 2008
I have a Brokers table and Trans (transactions) table. When I insert new transactions, I run a stored procedure or trigger to update the Brokers table since a transaction may have a new Broker. Is there an simpler way to do this than my query below?
INSERT INTO Brokers (Brokers.broker_id)
SELECT X.broker_id
FROM (SELECT DISTINCT broker_id FROM Trans) As X
WHERE NOT EXISTS (SELECT Brokers.broker_id FROM Brokers WHERE Brokers.broker_id = X.broker_id)
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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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Mar 14, 2008
My SQL is very basic. How do I create a query that will accept a parameter, an integer, and based on the integer, locate all the matches in a db?
SELECT COUNT(*) AS Expr1, tblArticle.ArticleIDFROM tblArticle INNER JOIN tblArticleCategory ON tblArticle.ArticleCatID = tblArticleCategory.ACategoryIDGROUP BY tblArticle.ArticleID
This isn't setting up the query to request a parameter.What am I doing wrong here? I"m trying to get the total number of articles for a particular category ID.
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May 21, 2008
i'm using sql express, management studio express and a visual web developer starter kit.
i have 4 tables: items; categories; categorization; old_items
the old_items table has both the item id and category fields in it, the new db has them separated: items.id; categories.id; categorization.itemId, categorizaton.parentCategoryId, both of which are foreign keys.
i need to get the old_item.id and old_item.category values into the new categorization table but it keeps choking on the foreign keys and i can't get past it. as far as i've been able to figure out so far, i need to turn off the foreign keys to do the insert but i'm not sure and i haven't been able to find any sql query examples that demonstrate it or explain it well enough for my n00b self.
i've read http://msdn.microsoft.com/en-us/library/10cetyt6.aspx, "How to: Disable Foreign Key Constraints with INSERT and UPDATE Statements" but i don't get how that affects it, it seems like one of the other options would actually disable them.
can anyone help? i've been trying all the permutations of queries i can think of and not getting it.
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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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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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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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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Jan 30, 2004
Hi,
I am trying to figure out if this is possible in Oracle or Mysql
Lets say I have 3 tables such that C could have either A or B as its parent.
A
{ id, name}
B
{id, name}
C
{other_id, comment}
Now other_id could be either A.id or B.id. What I want to be able to do is to define a foreign key constraint of the type:
CONSTRAINT FK_C FOREIGN KEY (other_id) REFERENCES A(id) ON DELETE CASCADE,
CONSTRAINT FK_C FOREIGN KEY (other_id) REFERENCES B(id) ON DELETE CASCADE
such that deleting A.id automatically deletes C.other_id where A.id = C.otherid and same for B.id
Ofcourse i am not able to do this. Is there any way that this can be done in Oracle and Mysql?
Thanks a lot,
Priyanka
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May 9, 2008
Starting with an example will make explaining this much easier.
I have two (or more) tables defined as follows.
Code SnippetTable1 Table2
Id [uniqueidentifier] Id [uniqueidentifier]
[...] [...]
Now, I would like to create a table Table3 that has its own primary key and references Table1 OR Table2.
Code Snippet
Table2
Id [uniqueidentifier]
ForeignId [uniqueidentifier, references Table1 or Table2]
This would enable me to insert any value into ForeignId that is present as the Id field in Table1 or Table2. Is this possible?
Best regards,
Till
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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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Sep 23, 2006
I have a situation where for a given customer, their invoices need to be sequentially numbered, without gaps.
Customer A Invoice 1,2,3,4 ...
A-1
A-2
A-3
A-4
Customer B:
B-1
B-2
etc.
The issue is 2 people creating an invoice for the same customer at the same time. Currently I don't assign the Invoice number until the user hits 'Save'. At that time I query for max(invoiceno) against the customer key and simply add 1. it's the last operation prior to saving against the backend.
If 2 users hit Save at the exact time, I'm getting the same (duplicated) Invoice Number.
What suggestions/techniques do you have to resolve this? Would "locking" of the customer record and storing the last highest invoice there play a part?
Thanks,
Peter
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Feb 21, 2015
CREATE TABLE IssueLog (
ItemNo int NOT NULL IDENTITY PRIMARY KEY
REFERENCES IssueProgress (ItemNo)
ON UPDATE CASCADE
ON DELETE CASCADE,
REFERENCES Approvals(ItemNo)
ON UPDATE CASCADE
ON DELETE SET NULL,
Msg 142, Level 15, State 2, Line 0
Incorrect syntax for definition of the 'TABLE' constraint.
I'd like to update or delete the IssueProgress plus update and setting null to the Approvals tables at the same time whenever the ItemNo of the parent table namely IssueLog is updated or deleted.
How can I achieve this?
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Feb 28, 2008
Hi,
I've been working as web dev for quite sometime now but there are still few things that i would like to clarify. Hope you guys can shed lights.
I currently have several tables and all this tables are having some 1 to many relationships. I know that how i insert value into my tables are very inefficient. I do it in this manner..
-> Insert a value in TableA
-> Query the latest ID that i have inserted in Table A then
-> Insert this value in TableB. And so on and so forth.
I believe there is an efficient way to to do this but i'm not sure how? Could anyone shed me a light on this matter?
Your reply would be highly appreciated. TIA.
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Oct 26, 2007
Hi guys,
I have created 3 tables namely Static, Dynamic and Demo...
Static has colums FormID(uniqueidentifier, PrimaryKey) and FormName(Nvarchar(50)).
Dynamic has colums formID(uniqueidentifier,PrimaryKey) and FormName(Nvarchar(50)).
Demo has 4 colums namely ValueID(uniqueidentifier, Primary Key), formID(uniqueidentifier, foreign key), Name(nvarchar(50)), Value(nvarchar(50).
Now the formID coloum in Demo table i have set as foreign key to both the dynamic table as well as static table on the formID colum in both table.
Now first i insert a row in the dynamic table then take the uniqueidentifier which is generated automatically and try
to insert in the Demo table in formID colum as that colum is FK to dynamic and static but when i try to insert a row it show that its violating the FOREIGN KEY CONSTRAINT
the exact error is
Msg 547, Level 16, State 0, Line 1
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Demo_Dynamic1". The conflict occurred in database "huzefaJTest", table "dbo.Dynamic", column 'formid'.
The statement has been terminated.
please if anyone know do reply.....
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