Database Design Question. I Am Close ;)
Oct 27, 2005
Lets say I am selling parts for cars, trucks, suvs, vans, etc.
I want a user to search for
a part by selecting a vehicle type, then a vehicle make, and then a vehicle model.
So
Vehicle Makes have to be related to Vehicle Types (I.E: Land Rover doesn’t make a car) and vehicle models need to be related to vehicle make (I.E Toyato doesn’t make a mustang Ford does).
So I am okay with those relationships individually but what is confusing me is how to ensure that a Mustang doesn’t show up as a Ford Car.
Lets say I have:
vehicle_typevehicle_type_cdvehicle_type_desc
vehicle_makevehicle_make_cdvehicle_make_descvehicle_modelvehicle_model_cdvehicle_model_descThen I might have an intersect between vehicle_type and vehicle_make because certain makes don’t have certain types of vehicles.
BMW doesn’t have a truck, Lexus doesn’t have a truck, so when a user selects truck as a make lexus nad BMW shouldn’t show up in the drop down.Vehicle_type_makeVehicle_type_make_keyVehicle_type_cdVehicle_make_cd I might have the same relationship between make and model:
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May 14, 2008
When I'm designing a merge join in BIDs, in particular a large one with say a couple hundred columns on the left part of the join (and only 1-2 columns on the right side), it takes 2-3 minutes to close and I notice it pegs the CPU on the computer during that time. I'm developing on a quad dual core 64 bit machine with 32 Gb of RAM.
What makes this problematic is if you have a several merge joins in the pipe, and you do something like add a column. Then you have to re-open every merge join to include that column, waiting 2-3 minutes for it to close. So adding a column to a pipe with 10 merger joins will take 20-30 minutes, most of which is just waiting for edit boxes to close. I've tried the options of "work offline" and setting the ValidateExternalData to false in the merge join property but those don't help. Anyone encounter this problem?
Thanks,
Lee
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Feb 13, 2008
Hi,
My question is if I close the sqlreader i am using. will that close the connection it uses or the connection will still remain open?
Syed
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Jun 4, 2007
Dear all
I created this trigger on a table that i think failed while execution. I tried to modify it and run it again but it seems that i cant do that. If i try and delete the database i also cant - saying that it is still in use. But i am not using it and ther are no other users connected to it. I think the trigger has probably hit a loop and that is holding the link.
To close that i know that a solution would be to restart the SQL server instance but that would be a bit hard since the SQL server where my test database resides is a production server and has few other databases that are important and few users use them.
Is there any way through a SQL statement that there can be forced a delete? Or force close all the connections? Or force close all the processes without actually restarting the SQL server instance.
I have tried all options that were offered on some other forums like forcing it to a single user but even that operation can not be performed saying that the database is still in use.
Thank you so much for all your help and time.
Sincerely
Dan
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Apr 13, 2008
Just to verify that this was an issue, I downloaded web developer 2008 and I do not experience this same problem.
BUT when I go to add a dataset in vs2005 for an asp website - all my db files come up in the dialogue box but everyone that click (every db file) I get "This file is in use. Please enter a new name or close the file that's open in another program."
But, like I said, I downloaded 2008 and it does not occur. Plus I KNOW that the db's are not being used. Can someone give me a remedy to this?
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Jul 14, 2015
In SQL Server Management Studio, it is possible to do the following:
a) In Object Explorer, connect to a particular SQL Server Database Engine, let's call it X.
b) Use that connection to generate many SQL queries, connected to X, in the right-hand pane.
c) In Object Explorer, connect to a particular SQL Server Database Engine, let's call it Y.
d) Use that connection to generate many SQL queries, connected to Y, in the right-hand pane.
e) Close the connection to X, which was created in step (a), from within Object Explorer.
In the right-hand pane, I am now left with a bunch of queries connected to X, and a similar bunch of queries connected to Y. Any quick way to shut all the queries connected to X, but none of the queries connected to Y?
This question can assume real practical importance if server X is a Live Production Server, and server Y is a Test Server, and my next job of the day is to run a change script against server Y....
I have looked for an option in Management Studio to "Close all queries connected to Server X", but haven't found one.
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May 13, 2015
I have a scenario like below
Product1
Product2 Product3
Product4 Product5
Product1 1
1 0 0
1
Product2 1
1 0 0
1
Product3 0
0 1 1
0
Product4 0
0 1 1
0
Product5 1
1 0 0
1
How to design tables in SQL Server for the above.
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Feb 13, 2002
Ok, I'm doing a football database for fixtures and stuff. The problem I am having is that in a fixture, there is both a home, and an away team. The tables as a result are something like this:
-------
Fixture
-------
fix_id
fix_date
fix_played
----
Team
----
tem_id
tem_name
-----------
TeamFixture
-----------
fix_id
tem_id
homeorawayteam
goals
It's not exactly like that, but you get the point. The question is, can I do a fixture query which results in one record per fixture, showing both teams details. The first in a hometeam field and the second in an away team field.
Fixture contains the details about the fixture like date and fixture id and has it been played
Team contains team info like team id, name, associated graphic
TeamFixture is the table which links the fixture to it's home and away team.
TeamFixture exists to prevent a many to many type relationship.
Make sense? Sorry if this turns out to be really easy, just can't get my head around it at the mo!
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Aug 13, 2007
Hi All,
I would like to restore database using RESTORE DATABASE ... REPLACE command.
If database exists already and has any open connections this command will fail.
I would like to close all existing connections to specific database before running RESTORE DATABASE ... REPLACE command.
I can do closing from Management Studio using checkbox "Close Existing Connection" when deleting database. Actually I need to do the same but from script.
Please advice me how to do it.
Thanks in advance,
Roman
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Oct 20, 2007
Hi, I am new to ASP.NET and Visual Web Developer 2005 Express, which I run on Windows Vista. I am currently going through some of the tutorial videos on http://www.asp.net/learn/videos/ . I encountered an error in Lesson 04 and I would have ignored it but it keeps haunting me and now I cannot proceed with the lesson 09 all because of the same error. I would really appreciate it if somebody could help me resolve this because it.
General error text
The database filename can not contain the following 3 characters: [ (open square brace), ] (close square brace) and ' (single quote)
Lesson 4 circumstances
Web.Configis modified to contain the following code just before the closing </system.web> tag:<anonymousIdentification enabled="true"/><profile enabled="true"> <properties> <add name="MyNewProperty" allowAnonymous="true"/> </properties></profile>
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Oct 29, 2015
I actually work in an organisation and we have to find a solution about the data consistancy in the database. our partners use to send details to the organisation and inserted directly in the database, so we want to create a new database as a buffer database to insert informations from the partners then make an update to the main database. is there a better solution instead of that?
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Feb 24, 2006
Hello everyone,I have a webcontrol that uses database-structures alot, it uses the system tables in SQL to read column information from tables. To ease the load of the SQL server I have a property that stores this information in a cache and everything works fine.I am doing some research to find if there are anyway to get information from the SQL server that the structure from a table has changed.I want to know if a column or table has changed any values, like datatype, name, properties, etc.Any suggestions out there ?!
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Jul 23, 2005
I have a system that basically stores a database within a database (I'msure lots have you have done this before in some form or another).At the end of the day, I'm storing the actual data generically in acolumn of type nvarchar(4000), but I want to add support for unlimitedtext. I want to do this in a smart fashion. Right now I am leaningtowards putting 2 nullable Value fields:ValueLong ntext nullableValueShort nvarchar(4000) nullableand dynamically storing the info in one or the other depending on thesize. ASP.NET does this exact very thing in it's Session State model;look at the ASPStateTempSessions table. This table has both aSessionItemShort of type varbinary (7000) and a SessionItemLong of typeImage.My question is, is it better to user varbinary (7000) and Image? I'mthinking maybe I should go down this path, simply because ASP.NET does,but I don't really know why. Does anyone know what would be the benifitof using varbinary and Image datatypes? If it's just to allow saving ofbinary data, then I don't really need that right now (and I don't thinkASP.NET does either). Are there any other reasons?thanks,dave
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Aug 16, 2007
Hi All,Can u please suggest me some books for relational database design ordatabase modelling(Knowledgeable yet simple) i.e. from which we couldlearn database relationships(one to many,many to oneetc.....),building ER diagrams,proper usage of ER diagrams in ourdatabase(Primary key foreign key relations),designing smallmodules,relating tables and everything that relates about databasedesign....Coz I think database design is the crucial part of databaseand we must know the design part very first before starting up withdatabases.....Thanks and very grateful to all of you....Vikas
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Sep 27, 2007
Hi All,
I am designing database where few of the master tables will reside in different database or in case different server. Scenario is
Server "A" with Database "A" may host the "Accounts" table.
Server "B" with Database "B" may host the "Product" table.
I am designing database "Project" which will hosted in Server "A".
My application requires this master tables [readonly access] as data inserted in my application refers this tables. Also there are reports to be generated which refer this tables.
How do i design my database and sql queries?
I am thinking of approach of having equivalent tables created in my database and writing service which keep tables in my database in sync. This will ensure good perfomance during transaction and reports as they will need to refer this table locally as opposed to different database or different server.
Any thoughts on above approach?? or any better/standard way for such scenarios ?
Thanks in Advance. Your inputs will be of great help.
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Apr 12, 2007
Hello:
My client has a db with the following structure:
Online US Searchable Map of the 50 US States. Users search criteria is the following: Query records by selecting state, county, then record. Each County table has 10-20 tables. All databases combined = 500MB and TLogs = 100MB.
How would you re-design a relational DB where users could query data by state-county-record. Currenty the DB's are created by the County of each state which creates hundreds of DB's in SQLServer with no realtionship to each US state. What would be the best design to ensure good performance, data integrity and maintenance? Would you create 1 DB with all 50 states, create 4 DB's and divide by region(N,S,E,W), 50 DB's of each state or leave it as is with each county it's on DB? Any suggestions would be appreciated.
thx
rob
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Oct 20, 2006
Hello, I am designing my first database with 5 tables for a demo project and am not sure if it works. an example below.2 of the many things I want visitors to the site to do is find a company by the industry sector they belong to,..andwhat sort of service or products they can supply. For instance a Employment agency maybe under professional services Table 1 Customer Customer_ID = primary key,,,, Sector_ID = Foreign keyComapany Name, Address, Phone, Postcode etcTabel 2 Industry SectorsSector_ID = primary key,,,,Customer_ID= foreign key banking, Education,Prof Services, etc Table 3 Trading ActivityTrading_ID = primary key,,,,Sector_ID = Foreign key, Products_ID= FkEmployment Agent, School, Lawyer etcTable 4 ProductsProducts_ID = primary key,,,,Trading_ID = foreign keySupply frozen foods, transport services, sports goods, etc Table 5 Account Account_ID = primary key,,,,Customer_ID = foreign keyAccount Name, Credit Limit, Payment Terms, Open date, Account contact etc One big point of confusion is, can I have the Customer_ID from the principal Customers tablein every table as a foreign key or must the tables be chained together one after the other as such. Advice appreciatedThanks
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Apr 10, 2007
Hi,
I need a hand with designing a database.
I am collecting results from a survey which has the following questions:
Call ref? How did you place your support call? Were you satisfied with the amount of time you had to wait until getting acknowledgement of the support call placed? 1 = very satisfied and 10 = very unsatisfied. How happy were you with the customer service you received upon placing the support call? 1 = very unhappy and 10 = very happy.How satisfied were you with the amount of time you had to wait until you heard from an engineer? 1 = very satisfied and 10 = very unsatisfied. How satisfied were you with the time taken to get your problem/query resolved? 1 = very satisfied and 10 = very unsatisfied Did you feel the engineer had enough knowledge to deal with your call? 1 = very good and 10 = not very good Overall how satisfied were you with the support call placed? 1 = very satisfied and 10 = very unsatisfiedIs there anything we can do to improve the quality of the support and service you received?
I want to store this in a database. Obviously I want to use best practice for design, normalisation etc. The stumbling block I am coming accross is the fact that each question has a number and each question has a score from 1 to 10 and storing this in the database. Any help appreciated!
Thanks
Andrew
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Apr 26, 2007
I am creating database tables for company testimonials. Database columns: name, position, companyname, comment, service we provided.
My question is that for each company - may have a multitude of different services from us, and different people with different positions in the same company may make comments.
What is best practice for putting this db structure together?
Thanks
Andrew
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Oct 29, 2007
Can anyone tell me how can i design database architecture for the Table Category & Product...so that i can make N-level entity relation....I have database in SQL SERVER 2000.
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Jan 30, 2008
I guess I am confused about something and need some help. I am looking at a database schema for about 20 tables in a database. I noticed that the firstcolumn in each table Is some type of Id. For example StudentId,TestId etc.Where the Id is a unique numeric sequential value.
So I have some questions?1- Do these Id's act as what are called indexes for the table?(Unique indexes)2- If the answer to 1 is correct, then how do I create these unique indexes? Is it as simple as declaring the Id column as the primary key and that this value will be generated automatically upon insert? 3- Is it necessary to have an Id column for every table, or may I only do it for a few of them?4. In relation to Question2, what do I need to do, so that the Id column will automatically be created when someone inserts a value into the database table with an ID column.
For example here are two sample tables
StudentsInfo
StudentId<PK> Name Age 1 Mark 33 2 Jill 23 3 Mary 25
PersonalInfo
Name<FK> SocialSecurity Address MajorMark 324-444-3342 15 Elm ArtJill 888-888-8998 21 North ScienceMary 876-777-2344 18 Byle Music
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Apr 17, 2008
Hi,I am planning to create a technical forum for our college. could any one give me an idea of how to design the database for the forum. what table and columns i should have?
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Nov 3, 2004
I have got a design issue.I have got 4 tables,having relationships.Now,user will edit records and save them,but I want to save the values which were exixsting before they were edited and saved.Implying,if a record is edited 50 times,then the values of each edit needs to be saved.How best ,can I achieve this.
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Oct 20, 2005
Hi !!We are designing a system where we ask people for their interests and store in into the database and send customize email. Following are the questions:1) Should we use Identity column as Primary Key and CustomerID column? OR we should create Custom CustomerID and use it as Primary Key? (I have read few articles about Identity column as Primary or not Primary, but need little advice what to accept)2) We have a Tables called : Interest & Customer_InterestCustomer Table:CustomerID, Customer Name, Address, Email, Signup DateInterest Table:InterestID, InterestNameCustomer_Interest: (Need suggestion for How to design this)Should Table be design like:Option1: CustomerID, InterestIDOption2: CustomerID, Interest1, Interest2, Interest3, Interest4i.e.Lets Say: Customer table has CustomerA, CustomerB, CustomerCInterest table has Interest I1, I2, I3, I4Lets Say CustomerA Signedup for Interest I1, I2, I3 and CustomerB signed up I1, I4As per Option1:Customer_Interest Table witll haveCustomerA, I1CustomerA, I2CustomerA, I3CustomerB, I1CustomerB, I4ORAs per Option2Customer_Interest (Where Interest Column is bit column..... 1 = Signed up, 0 = Not Signed upCustomerA, 1, 1, 1, 0CustomerB, 1, 0, 0, 1Which way we should design? 3) If we select Option2, and if we are displaying data in ASP.NET Page, will there be any issue if we use 3 tier architecture?Thanks !!!
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Nov 10, 2005
I am designing an inventory database in which I need some help, I have the following entities:ItemsNotebookWireless CardADSL Modemetc...ModelsAcer centrino 1.6Acer centrino 1.733COM 4x125 hours Wi-fi access50 hours Wi-fi accessetc... PackagesPackage A:Acer centrino 1.63COM 4x125 hours Wi-fi accessPackage B:Acer centrino 1.733COM 4x150 hours Wi-fi accessI made a table for the items having the following fields: Item_ID, Item_Nameand another for the Models having: Model_ID, Model_Name, Item_Type(Foreign Key to Items table)up to this point is this correct?About the packages table, I don't know if it is correct to have a field for each model (one for notebook, other for modem, and other for wireless card) like this it would be like having 3 foreign keys to the same table but nothing distinguishes themI don't know how to relate the packages and the models table.Any recommendations for a proper design for those entities?
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Dec 20, 2005
I am creating a knowledge base. I want the user to be able to choose a category such as Hardware, Software, Etc. then I want them to be able to choose what type of software such as word, excel, ets.
It will then display in a gridview problems, solutions, submitted by, last updated, and review date.
The gridview will allow users to update solutions and I would also like the ability for technicians to be able to add new Problems/solutions.
What would be the best way to handle this?
Any tips are appreciated.
Rick
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May 2, 2000
I have requirement to create table of 100 columns. Should i create 100 columns in one table or i should create three coulmn table with column id, column desc, column value with 1 row in 100 column table = 100 row in 3 column table. Which will be faster & efficient in performance, io & size.
Thanks
Manoj
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Dec 13, 2000
The database will provide content management for an Intranet site.
On the site we have a number of articles which are categorised. Each categories can also have sub-categories.
The relationships would seem to be
Category---->Sub-Category----->Article
A category has one or mant sub-categories. A sub-category has one or many articles.
However some categories have articles but are no sub-categories.
Should I create a further relationship between Category and Article to cater for this instance or should their be a dummy category record in this instance?
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Sep 30, 2002
Hi everbody!!!
i first would like to congratulate this forum for the new member!!! ME ;)
Then i have this question, i´m going to design a database in SQL server and i would like to have some basic hint how to build it up.
It´s a calender for a ASP.Net site i´m building and for the moment it´s just 4 things to have in mind
-users
-dates
-todo´s
-birthdays
If something is unclaer then PLEASE ask me!!
Thanx in advance icaaq
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Dec 24, 2002
Hi all:
I am designing a sql server database to keep track of patient history and data about various diseases. Is there a book or any kind of resource that I can refer? Any help is appreciated.
Thanks,
ndba
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Feb 9, 2001
I had a consultant design a database for me and every table contains a GUID. Most tables already contain a field that is unique. Is this necessary? In my view, the queries are no more efficient and it just takes up more space.
Thanks
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Sep 30, 2004
trying to work on a new project, i need some ideas to setup this design model.
sql 2000 database and asp.
This is call center environment where agent bid on shift (schedules) base on most disireable to least, and it process base on seniority.
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Jan 14, 2005
Hi I was wondering if you could help me. I am currently trying to design a database. This database 4 tables, Main_Cat, Sub_Cat,SubSub_Cat and Prod_parent. How ever, not every sub_cat has a subsub_cat. And waas just wondering how I would link this.
Thanks
Ashley
I have attached an image of what I have so far, if any one could help it would be greatly appreciated
Thanks
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