Hi,
Can anyone recommend books in Spanish for Database Design and
Normalisation?
¿Puede alguien recomendar libros en español para Diseño de Base de
datos y Normalización?
Thanks,
Michael Holberton
Hospedaje Los Jardines & Sacred Valley Mountain Bike Tours
Cusco Database Development and Cycling Services
http://www.machawasi.com/
http://machawasi.blogspot.com/
http://databaseservices.blogspot.com
Hello,
I am relatively new to database design but think I understand most of the basics but would appreciate some clarification on a few points. I have just been lumbered with what I believe an extremely inefficient and badly designed database and would like to improve in the most logical way.
-Is it always preferable to fully normalise a database?
For example, if the table held people, it could contain the house, town, country, continent that this person belonged to. At the moment the database I'm dealing with has all of these things contained in the 'people' table, and stored as text, not as a foriegn key linked to another table, which is obviously not an ideal approach and not normalised at all. In a fully normalised database, all these attributes should have their own table I.e., one for house, town etc.
Now to run a query to find out all the people who lived in Europe, I would have to join all these tables together I.e. person to house, house to town, town to country, country to continent. This seems logical but perhaps a bit long winded. If this was a common query, would I solve this situation by creating a 'view' in the database? I've also read about stored queries, but from it seems the consensus now is that these are to be avoided as it mixes business logic with database management creating a brittle system that is difficult to evolve. Wouldn't a 'view' pose a similar problem though? I could write everything in the application, but wouldn't this slow queries down?
I really appriciate the effort you guys put into answering all the questions posted here, thanks! My other questions are in different posts so that answers are only related to one subject.
Hi All,
As an accomplished web devver of many years using ASP and ASP.NET in conjunction with Access and SQL Server, I am a bit pedantic on the rules of good data structures.
Specifically the two main rules of data redundancy and normalisation.
The latter dictates at the lowest level that a data table should NOT contain a field that can be gleaned from one or a combination of others.
I have a problem with this now, I am building a betting system which will take the odds given, plus the stake placed and calculate the winnings or losses accordingly.
There is an added complication in that not all profit is calculated the same way, as a horse can also be 'placed' which does the same calculation as for profit, but then quarters it, so one single select statement won't do.
I could calculate this at data entry stage on a per entry basis and simply store in a Profit/Loss field and keep the value for each bet, however I know this is not the correct thing to do!
My other alternative [and the correct method] is to do this calculation at data request time, but that would involve the use of a cursor or loop in the SP.
I am aware of the huge resources a cursor can consume and I am not sure which is worse, using a cursor or ignoring the normalisation procedures.
So the question is this, what would you do here?
Since I may not be the same SQL Server expert as I am a programmer, is there an alternative way of reading all the bets and doing these calcs on SQL server and bang them back to ASP as a self contained recordset with all the profit/losses calculated for each bet?
Each bet as a unique EntryID and there is a field called Result which stores 'Win, Place or Loss' accordingly.
Thanks in advance of any help/opinions.
:)
Does anyone know of a good book or white papers that compare the relativestrengths, capabilities and features of databases like SQL*Server, Oracle,Informix, MySQL etc? Thanks.
View 1 Replies View RelatedHi, Im installing a software which use SQL Server 2000 in english, but currently I have in all computers another program that use a ODBC for SQL 2000 in Spanish.If I install the components for the client of SQL in English then the another application got an error ODBC somehting related with the driver.
So there are any way to have a client for use SQL in spanish and english at the same time.So I mean I got two server one in spanish one in english, and just one computer client with twwo applications.
regards
and thank you
Hi,I have a database and want to store data in Spanish and English. Toaccompish this:1. Do i need to create separate tables for both the languages likeitems_en and items_sp?2. If I opt for the UTF16 charset what single collation setting can Iuse?Thanks and RegardsJackal Hunt
View 1 Replies View Related
I want to have some static text in spanish on my report.. and what is the best way to do it.. any link or help will be appreciated..
Regards,
Karen
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.
I have a developer that would like to store a column of data in Spanish and another column of data in French. What collation should I set for each column?
View 3 Replies View RelatedHello,
I need to install 2187 hotfix to a sql server 2000 spanish version, but in the download section of the hotfix spanish is the only language that is not available, Anybody knows why?
Thanks in advance
Jordi.
dear friends, I installed Sql ServerExpres SP2 spanish vertion in Vista home basic, I Cant Attach a data base, it reports me the error cant access to Model data base, error 916, and when I try to Create a new data Base it Reports me, Permition denied to create a data base in master, error 262
I am trying to download English Vertion, but When I download it olways try to download me the sqlexpres32_ESN.EXE which have these problems.
if any can help me,
Regards in advance Santiago
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!
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?
View 6 Replies View RelatedHello 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 ?!
View 3 Replies View RelatedI 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
View 7 Replies View RelatedHi 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
View 3 Replies View RelatedHi 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.
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
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
View 1 Replies View RelatedHi,
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
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
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.
View 2 Replies View RelatedI 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
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?
View 4 Replies View RelatedI 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.
View 3 Replies View RelatedHi !!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 !!!
View 18 Replies View RelatedI 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?
View 6 Replies View RelatedI 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
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
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?
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
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
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