Relational Database
Apr 22, 2006
Hi
I'm using
VB.NET,ADO.NET in ASP.NET .
Microsoft .Net framework 1.0
Windows 2000
Visual Studio IDE
and SQLServer.
I have to create to tables as
Table1 contains ID,Name
Table2 contains ID,Marks,Foreign Key ie Primary key of the table Table1.
Give me an information how to create these two tables in SQLServer (I know how to create a table but i don't know how to create a table which includes Foreign Key.)
Then using Dataset i want to display the records as Name,Marks which are stored in two tables.
I have studied that in ADO Join query and record set object is used but it gives a problems and it is not good when we want to transfer the data between two applications or pages but dataset solves all those problems.
Give me an information about it.
Kindly help me
Thanks in advance
Regards.
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Aug 4, 2005
Hi all,
I am trying to create a diagram for our database, during the creating, I create some of the relationships which were not there(basically our original database is not relational database, that's why I am doing it)
So sometimes I have to chage data type in order to create a relationship for the coloumns in different tables. i.e. change char(16) to varchar(7) (I checked the field that make sure all the data in this field is <= 7 characters)
But when I saved the diagram, there is an error message that state:
Errors were encountered during the save process. Some of your database objects are not saved on your diagram.
'agent' table saved successfully
'VisitUSA' table
- Unable to create relationship 'FK_VisitUSA_agent'.
ODBC error: [Microsoft][ODBC SQL Server Driver][SQL Server]ALTER TABLE statement conflicted with COLUMN FOREIGN KEY constraint 'FK_VisitUSA_agent'. The conflict occurred in database 'CMC', table 'agent', column 'AgentCode'.
What does that mean? is it caused by some of the agentcode data in VisitUSA table which is not in agent table?
Thanks!
Betty
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Apr 26, 2007
If I have a table that contains default values or a constant values do I have to relate it to my other tables that might need them. Thanks in advance.
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JSC0624
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Feb 16, 2006
Hi,I have a very simple question.In what cases are relational databases necessary?Are they really necessary in cases where only asingle type of query is to be performed based on one uniquefield or can we just put all fields together in a single databaseand just access them through that unique field?
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Jun 27, 2007
Hi guys,
What is a "Relational Database"?
Thanks,
Aldo.
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Dec 27, 2005
What is the best approach for storing hierarchical
data in a database? For example, if I need to store a tree menu system,
how would I do that allowing for the most normalization within the
database, using the least number of queries/resources when pulling the
data out, and using the least amount of overhead both in storage and
retrival?
-Chris
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Oct 15, 2005
Dear friendsI am conducting a survey on Relational Database usage and would likeyour help. The study is part of my MBA Dissertation.Could you kindly spare 5 minutes to take part in this survey?http://FreeOnlineSurveys.com/rendersurvey.asp?id=120816ThanksRajeev
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May 2, 2007
I have a database has the following linklist structure. A, B, B1, B2 and B3 are records.
A is a group and the others are group members
***************************************
A.PointertoB
B.ForwardPointertoB1
B1.ForwardPointertoB2
B2.ForwardPointertoB3
B3.end
***************************************
I want to convert them to relational database structure so I need to find following pointers
B.PointertoA
B1.PointertoA
B2.PointertoA
Can I use sql to find the pointers? Thanks in advance.
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Apr 25, 2007
Can this be done in ASP.Net, as it stands my database views in my ASP.Net application are just standard
Unlike the view in MS Access which shows the collapsable linked data below the data (from a different table)
Many thanks
Rich
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May 22, 2008
I need to create a dimension with a hierchy derived from 3 other dimenions where one of the dimensions contains a recursive hierarchy.
eg:
In my RDBMS I have; a table "Entities" which contextualises geographic locations and (typical columns include and id and a description with values for: ID1=United Kingdon, ID2=France, ID3=Norway, ID4=Finland, ID5=Europe, ID6=Scandinavia, etc.), another table "Entity_Type" which contextualises the values held in "Entities" (Typical olumns; ID1=Continent, ID2=Country) and a table, "Geo_Code" which codifies the values from both "Entities" and "Entity_type". They act more or less like 2 dimensions ("Entities", Entity_Type) and a fact table ("GEO_Code").
The third table has a recursive hierarchy in that it references it's own ID again in column "Entity Reference".
The first table is Entities, the second is Entity_Type and the third is the one that references both.
id
description
01
England
02
Norway
03
Europe
04
Scandinavia
id
description
01
Continent
02
Country
id
entity
Entity_Type
entity Reference
01
03
01
NULL
02
04
01
NULL
03
02
02
02
04
01
02
01
From the last table "GEO_CODE" we can determine the following:
01. Europe is a continent
02. Scandinavia is a continent
03. Norway is a Country that is in Scandinavia (Entity Reference recursive referencing ID 02 of the same table where the Entity is 04).
04. England is a Country that is Europe (Entity Reference recursive referencing ID 01 of the same table where the Entity is 03).
How do I create a new dimension using Visual Studio in Analysis Services where the Hierarchy is reflected?
So far, I have managed to depict 2 Hierarchies: where a dimenion depicts Entity (Countinent/Country) as level 1 and the value of the corresponding entity (Europe, ENgland, Norway, Scandinavia) in level 2 but how do I get to the last bit where the Entity Reference references the location of the Country or Continent???
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Apr 10, 2008
Sharepoint is a pretty darn dynamic service and that got me thinking of how databases are created.
Just wondering out loud, surely someone has thought of creating databases in such a manner, but I don't know if it's a thought that has been struck down.
It would look something like this:
Single Table
ID uniqueidentifier PK
ParentID uniqueidentifier FK to ID
Name nvarchar(MAX)
Value nvarchar(MAX)
In this manner, you would create your database "columns" as needed in the data-layer.
If that is too strict, (every datatype would be encoded to base64), you could create a value option for basically every data type. EG. nvarchar(max), nvarbinary(max).... and add another field that describes the data-type to be used for that "column"
ID uniqueidentifier PK
ParentID uniqueidentifier FK to ID
Name nvarchar(MAX)
DataType nvarchar(50) //constrained to allowable datatypes
MaxLen nvarchar(31) //ahh, what the hey, let's add this for sniggles.
ValueNvarchar nvarchar(MAX) nullable
ValueNvarbin nvarbinary(MAX) nullable
....
Now, to allow the "values" for those "columns", you may be able to still use the single-table approach, but it may be better to have an extra table for that (probably even a different partition and drive).
Things to consider, indexing.....
In development, the data-layer would handle the creation/reading of table columns.
The business-layer, which could be many for different parts of a company, would make it's requests to the DL. It may need a username, and the DL would either just create it, or suggest an already existing username column. The path to that username may not be where a particular biz element wants it, so they will ask the DL create another under a diff path.
The business-layer is probably the most important reason for wanting a single dynamic table.
In the end, the relation structure could be like:
Human //dir, no value, no parent (root)
FirstName //value - text
LastName //value - text
Parent1 //value - Me Id
Sibling1 //value - Me Id
SiblingN //value - Me Id
School //dir, no val
ParentId //value - Id (perhaps category would be Building)
Name //value - text
The sibling N would be an example of how a table may need to be dynamic. A positive of the single-table approach is no limitation on number of "columns". Another is the ease to move a hierarchical structure if needed. School may want to be University instead of just "school" and be placed as a child of "school".
Looking for any thoughts on the subject,
Nathan
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Jun 12, 2006
Hi, all here,
As people say, Microsoft was the first major database vendor to include data mining features in a relational database. What dose this exactly mean? Thanks a lot for any guidance.
With best regards,
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Dec 25, 2007
hello,
I am beginner for asp.net and sql server. I used Sql server manegement studio full version and I exported my aspnetdb which was created by VS2005 to my host sql server. I have a question:
relational tables are not relational no longer. I noticed that when I created database diagram. what is wrong by exporting?
thanks for your helps...
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Oct 3, 2007
I have a membership database and a profile database with a userid column in both. The foreign key is in the profile database where i want a persons profile details to go like location,occupation and what not. How do I make it so when a new user registers a userId is created in the profile database that matched the userid in the membership database so i can query out profile details based on a registered members userid?
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Jun 21, 2005
Hi all! I am working on a piece of SQL at the moment and I'm getting a little confused. I have 3 tables: Items, Attributes and a table linking them. I have 5 attributes and an item can have any of the 5 attributes. So my linking table holds the ItemID and the AttributeID and there can be 1-5 entries for each Item. A user can search for items based on Attributes; so they can tick 5 checkboxes that represent the 5 Attributes. So I need to build a query based on their choices. At the moment I'm using:Select * FROM ItemsINNER JOIN linking on Link_ItemID = Item_IDWHERE Link_AttributeID IN (10, 13, 17)But this brings out the Item that have either AttributeID of 10 or 13 or 17 whereas I need it to pull out ONLY items that have a AttributeID of 10 AND 13 AND 17.Can anyone help with this query? Sorry if this is badly worded. The solutions is prolly something really simple I have overlooked... :SI've also tried:Select * FROM ItemsINNER JOIN linking on Link_ItemID = Item_IDWHERE Link_AttributeID = 10 AND AttributeID = 13 etcBut obviously that won't work! :s
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Jun 18, 2001
what is the difference in making relational databases in SQL vs. Access? Do you need to make them if you will be using ColdFusion? What do the other fields in minor tables need to be in order to connect them to a major table when it will all be based on a number that is in the major table? i'm kind of confused on this issue...Thanks!
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Nov 10, 2004
I have a database with 3 tables in a many to many relationship.
EmployeeGamingLicense
EmployeeDocuments
EmployeeRenewals
I created the third table to hold the employeerenewal dates, I did this because I cant have repeating vaules in the primary table. I am just making sure that my course of action is the correct one. The purpose of the Employeerenewals is to give the users an indication that a certain renewal has been processed, because in the past there was several hundred that were not processed. The problem was that the users had no way of knowing this. What I was thinking was having the primary table calculate a renewal date based off the finalsuit and show the results in the Employeerenewals with a yes of no drop down. Now the yes or no drop down box will be give the users their red flag if the renewals have been processed or not.
Does that make sense??
Thanks guys :)
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Sep 4, 2006
Hi
I am developing a website current and i have a database that seems to be growing very rapidly..
I would like to ask if anyone knows of any good tutorials/examples on relational databases?
Also does anyone know of any good database design tutorials/examples?
If it helps i am using Microsoft Visual Web Developer
Thanks
If you think you know it all?! You know nothing!
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Jun 15, 2007
My question:
How to have an unknown number of authors returned for a list of books, with the multiple authors being returned on the SAME row as each book
My table structure:
Table A - Books
-------------------
BookID | BookName
-------------------
1 | Book One
Table B -
RelatingTable
-------------------
BookID | AuthorID
-------------------
1 | 60
1 | 61
Table C - Authors
-------------------
AuthorID | AuthorName
-------------------
60 | Bob
61 | Joe
My query:
SELECT * FROM Books, RelatingTable, Authors AS a
INNER JOIN Books AS b ON b.BookID = r.BookID
INNER JOIN RelatedTable AS r ON r.AuthorID = a.AuthorID
Output I am getting:
-------------------------------------------------------------------------
b.BookID | b.BookName | r.BookID | r.AuthorID | a.AuthorID | a.AuthorName
---------|------------|----------|------------|------------|-------------
1 | Book One | 1 | 60 | 60 | Bob
1 | Book One | 1 | 61 | 61 | Joe
-------------------------------------------------------------------------
Desired output:
-----------------------------------------------------------------------------------------------------------------------------------------------------
b.BookID | b.BookName | r.BookID[0] | r.AuthorID[0] | a.AuthorID[0] | a.AuthorName[0] | r.BookID[1] | r.AuthorID[1] | a.AuthorID[1] | a.AuthorName[1]
---------|------------|-------------|---------------|---------------|-----------------|-------------|---------------|---------------|----------------
1 | Book One | 1 | 60 | 60 | Bob | 1 | 61 | 61 | Joe
-----------------------------------------------------------------------------------------------------------------------------------------------------
The desired output does not have to be like an array - I only assume thats what it would need to be
If you can post anything to help me get in the right direction I would really appreciate it
Thanks for your time!
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Jul 20, 2005
Hi,This question has been bothering me for some time. A lot of peopleseem to "think" XML is the king of data problems, and I've heard thatnext version of SQL Server is going to have a strong XML flavor,meantime, I seem to get the impression that a large number ofhard-core relational model gurus do not seem to be that impressed withXML (technical value of this extra layer seems to be limited whilebusiness value might be substantial for instance, more software work,more disk space requirement etc. etc.). What's your take on this?Generality or specifics, all welcome. One specific question is, howcan XML supplement relational model?Thanks.
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Aug 1, 2006
I have a few questions for you guys. I have a client
application that can be offline or online. While offline, records can be added and need to be later synced to production.
I will use rda to pull the table down, and this is working fine. Now what if I
have multiple tables where I want a foreign key relationship?
With rda I can only pull down one table at a time from
everything I've read. Now say create a constraint after pulling the two or more tables down. While in offline mode I create a new record on two seperate tables with foreign key/primary key relationship.
When I do the push to the server will it automatically
update the foreign key reference (locally) to the right one on the production
server? Or will I get a duplicate primary key error? On the production server the primary key will be different because of the identity. This is very important because I will have multiple clients.
Thanks in advance
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Sep 22, 2007
Hi, not sure if this is the right forum for this question.
I am creating relational tables for the first time in sql server express. I will have an orderItems table and an orders table. the MenuItems table is the problem. It is a catalogue of books. There will be about ten columns. all are unique to each book. i.e isbn number, title, author, publisher etc. but ten columns seems to be quite cumbersome. it may be easier to break the table down into two tables (i.e. primary details and secondary details perhaps) However to populate the table in the first place it would be easier to have it as one table instead of opening and closing 2 tables Adding the odd book to the two tables in the future would not be a problem. so the question is can i create a table and then brak it into two relational tables afterwards. If so how do i do this. this is my foirst go at relational tables and i am still trying to get a handle on visualising them. If my logic is up the wall please let me know....
Nick
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Nov 14, 2005
I am just now starting the switch from .NET 1.1 to .NET 2.0. I really like the new way of using the SQLDataSource and setting up Views declaratively as opposed to doing it all in code, which brings me to my question.In some of my applications I have a single Stored Procedure return multiple result sets to a single DataSet where I have a DataRelation set up. Then I can have nested DataGrids that use the GetChildRows() method to filter the results to display the hierarchical data. I would like to do something similar with the SQLDataSource and GridViews but haven't found a way to get multiple result sets.One thought I had was to create a Strongly Typed Dataset and then use the ObjectDataSource object, but I still didn't see a way to get child rows out of the datasource. I've seen an example that uses a <FilterParameter> to get nested data, but there is an extra trip made to the server for each parent item as it just put an extra parameter in the WHERE clause of the query.
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Sep 28, 2005
I am building a data warehousing solution without using analysis services or OLAP or OLTP....
Dont ask why ... but I have to....
Ok so which table structure would be better ?
dimention 1|dimention 2|dimention 3|matrix 1|matrix 2|matrix 3|matrix 4....
or
dimention 1|dimention 2|dimention 3|matrix name|matrix value
I prefer the second one....
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Apr 2, 2008
Hello everyone
When converting From Relational data into XML which
method ie RAW, AUTO, PATH, EXPLICIT is mostly used and why please
Regards
Rob
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Apr 24, 2007
This is a bit of a trivial question, since I know how to actually create the code in SQL. Hope this is the right section to post it in too, since it sort of concerns design I guess..
My problem is how to I represent the following SQL query in relational algebra:
SELECT *
FROM Staff;
Since I'm using SELECT, I assume I use selection to represent it, so would it be as "ó(Staff)" [using the sigma symbol, in case it doesn't show]? But as I'm not specifying a predicate since I wish to select all fields in Staff, would it be simply represented as "Staff"?
I appreciate any help... it's been baffling me for a while
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Dec 12, 2007
Hotel(hotelno, hotelname ,city)
Room(roomNo, hotelNo,type,price)
i need the reltional algebra to list the price and type of rooms in the hilton hotel
thanx
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Jul 20, 2005
Hi Please help for this simple problemDTS Transfer or any other method?I have Customer_Order Table and customer_Order_Details Table.For OrderID = 1, I have 3 rows of Order Details.I want to transferCustomer_Order Table for OrderID 1 in DTS, the system should transferOrder Table as well as Order details table Rows for ORderID =1.How to customize in DT or is there any way to get this data to transferfrom source DB to Dest DB?KAMAL KUMAR V--Posted via http://dbforums.com
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Apr 7, 2008
I understand the basics for doing an insert. Their seems to be many ways of achieving the same thing in .net. I have used the tableadpaters and sqlcommand functionality to achieve this. My one question is how foregin keys should be created in associated tables. EG so if i create a new record entry in one table and the primary key for that entry is a foreign key in another table, do I need to call 2 table adapters, or run 2 sqlcommands(taking the primary key from the first traction and use this in the next transaction)?
Any help or direction for some good tutorials on this would be much appreciated.
Thanks
Mark
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Jul 3, 2013
Is there a good, common way to migrate data from relational tables into hierarchical json?
I am asking this because, basically, I prefer not to write a lot of procedural code.
I am currently working with MS SQL Server db and I’ll soon need to do the same with My SQL db. I use java and java db connectivity for access. It would be great if any of these two db’s can somehow assemble the data server-side.
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Mar 4, 2008
Hello friends .....What is the answer for this question in frame of SQL 2005 Management Studio or SQL Server 2000 ?
What are the properties of the Relational tables?
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Sep 21, 2006
I am trying to get predictions and insert them into a DB table.
Following is the code I am using , but I am getting an error saying
'
An error occurred while preparing the query
,
Pl. help.
begin
declare @v_query varchar(5000);
declare @full_query varchar(5000);
declare @v_dbquery varchar (200);
set @v_dbquery = char(39)+'SELECT
[ProspectAlternateKey],
[FirstName],
[LastName],
[MaritalStatus],
[Gender],
[YearlyIncome],
[TotalChildren],
[NumberChildrenAtHome],
[HouseOwnerFlag],
[NumberCarsOwned]
FROM
[dbo].[ProspectiveBuyer]'+char(39);
set @v_query = 'SELECT
[TM_Cluster].[Bike Buyer],
t.[ProspectAlternateKey],
PredictProbability([TM_Cluster].[Bike Buyer])
From
[TM_Cluster]
PREDICTION JOIN
OPENQUERY([Adventure Works DW],@v_dbquery) AS t
ON
[TM_Cluster].[Marital Status] = t.[MaritalStatus] AND
[TM_Cluster].[Gender] = t.[Gender] AND
[TM_Cluster].[Yearly Income] = t.[YearlyIncome] AND
[TM_Cluster].[Total Children] = t.[TotalChildren] AND
[TM_Cluster].[Number Children At Home] = t.[NumberChildrenAtHome] AND
[TM_Cluster].[House Owner Flag] = t.[HouseOwnerFlag] AND
[TM_Cluster].[Number Cars Owned] = t.[NumberCarsOwned]'
-- print @v_query
set @full_query = 'select * from openquery (DMserver,'+char(39)+ @v_query +char(39)+')' ;
print @full_query;
EXEC (@full_query);
end
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Nov 21, 2006
I've not found much guidance so far about the pros and cons of mining OLAP cubes vs their underlying fact and dimension tables. Can anyone offer advice in this area, or point me to more info about this?
Thanks,
Kevin
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