Database De-normalization, Is It Worth It?
Feb 14, 2008Is it worth it for performance purposes to create additional fields in table so that when a database query is made two tables don't need to be joined?
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Database Normalization
Jan 31, 2006Hi,I am using MS-SQL server to store my database.My problem is that I have around 150+ database files in DBF format.Each database file consists of fields ranging from 2 to 33 in number.Also, there are some fields which have just one entry and rest areNULL.This database will be accessed by a printing software.Please advice as to how I should proceed to normalize this database.Regards,Shwetabh
View 2 Replies View RelatedDatabase Table Normalization
Dec 8, 2005Hi all,
This is actually a pretty stupid question, but somehow I need an answer from you experts.
We are currently building a web application using ASP.NET, and it simply manages contact information, like outlook. Contact information include first name, last name, birthday, etc. It also tracks address, phone number, and email. Here come the problem.
We allow only one address, 4 phone numbers and an email for each contact. When we building the database table, should we create 6 fields to contain all the information or should we create address, phone, and email table and then create the relationship between them.
Will the first method speed up the performance? Or the second method is the proper way?
I need some pros and cons on each
Thanks so much for your opinion
Sam
Database Normalization Question.
Sep 29, 2006Hi,
I'm designing a database to represent items in a restaurant menu. An item has the following information associated with it.
Item-
Name, Price, Catagory, Ingredients(many), and Options(many)
Ingredients-
Name, and Price
Catagory-
Name
Options-
Name and Price.
This is how I have it set up so far.
-------------------------------------
Table Item
-ItemID as Primary Key
-Name
-Price
-------------------------------------
Table Ingredients
-IngID as Primary Key
-Name
-ItemID as relationship to Table Item
-------------------------------------
Table Catagory
-CatID as Primary key
-Name
-Item ID as relationship to Table Item
-------------------------------------
Table Options
-OptionID as Primary key
-Name
-ItemID as relationship to Table Item
-Price
I would like to know if i'm normalizing correctly. Much Thanks.
Dan
SQL 2012 :: Normalization Database Tables
Jan 15, 2015I have decided to use Wufoo online forms so collect evaluation data from my clients. Each form will have different type of data.
For example
Form 1 might have:
Client id, name, user id, comments
Form 2 might have:
Client id, name, user id, address, comments, telephone number
Form 3 might have:
Client id, name, user id, comments, date of birth, email address
Each form can have over 20+ data types which can be all different to other forms.My question is: What is the best way to store all the data into sql server without creating new columns of new data types everytime a new form is created in wufoo.
Database Normalization/Design Question
Jul 23, 2005Normalization Question - Please bear with me, hopefully things will beclear at the end of the question.Given a treaty table containg treaties; Treaty1, Treaty2 etc and abenefit table; Benefit1, Benefit2 etc. A treaty can only have certainbenefits:-For example Treaty 1 can process Benefit1 and Benefit2.To maintain this relationship a new table TreatyBenefit has beencreated: -Treaty1Benefit1Treaty1Benefit2A further table called policy has been added. A treaty can have manypoliciesTreaty1Policy1Treaty1 Policy2A Policy can contain 1 or more benefitsPolicy1 Benefit1Policy1 Benefit2 etc.Giving structure as follows:-T - TB - B|PGiven the above, should there be a constraint between policy andTreatyBenefit or Policy and Benefit to enforce referential integrity.If so which constraint, if not what form of constraint / checkingshould I be using, to ensure that a Policy will contain the correctbenefits.ThanksAdrian
View 7 Replies View RelatedIs MCDBA Worth It?
Sep 23, 2005Is MCDBA worth of the time and money one has to put into to acheive it?
I am talking in terms of getting a job.
Do you think after getting MCDBA you have gained sustantial knowledge about the subject?
I havent appeared for any of the MS exams as yet
but would like to start with 70 228 and 70 229.
I like reading BOL, but i guess for certfn exams you have to have a diff approach...
Is It Worth Upgrading To SQL2000
Feb 2, 2001I currently have several databases running under SQL 7. My Shop is migrating to Windows 2000. I was wondering, does SQL 7 run as good under Win 2000 like it does under Win NT? Since we are migrating should I upgrade to SQL 2000 or should I stay with SQL 7?
Thanks.
Need To Get Just Last 2 Years Worth Of Data
Jun 23, 2008SELECT * FROM TEST NOLOCK
WHERE FY_CD = DATEPART(YEAR, GETDATE())
This gives me last years - but they want last years 2007 and 2008
Any suggestions
SQL 2000 Parallelism - Is It Worth It?
Jul 23, 2005Hi,I have a sql 2000 server with 8 processors, server settings are asdefault. I read on Technet that it is good practise to remove thehighest no. processors from being used for parallelism, correspondingto the no. of NICs in the server. One of our 3rd party developers hasrecommended only allowing one processor to be used as there is aperformance hit by the server working out which processor to use. Doesanyone have a definitive answer to this? I suspect he's wrong but I'dlike some hard evidence if possible, thanks.Kev.
View 3 Replies View RelatedBest Method Or Is It Even Worth The Effort?
Jun 21, 2007Hi,
I have a question regarding a project I am working on and I'm not sure what the best way to do it may be, I am new to SSIS and would like to gain some exposure using it, but don't know if this project is overkill or even possible using SSIS.
*** PROBLEM ****
Basically I have a large number of flat files each file contains different columns and data. What I want to do is import all of the data from the flat files into corresponding tables in SQL Server. The tables in SQL server are already defined with data structure to match each file. The first 10 characters of the flat file are also the same name as the SQL table. So it seems easy enough to just import flat file to table one by one, but I cannot figure out how to match the flat file structure to each table without setting up a task for each table (there are roughly 50-60 tables). Another reason I want to do it with SSIS is these flat files have to be imported on a weekly basis.
**********************
Is it in my best interest to just create a stored procedure that basically loops through the files and imports the data? Or do you think using SSIS is the best solution? I have looked at SSIS a bit and thought maybe I could use the bulkinsert task, but it appears it cannot dynamically change due to column specs. I figured out how to loop through the flat files using the foreach task, but I could only get it to import into one SQL table. I also started looking at the dataflow task and thought about creating a script task, but I'm not sure if that would work before I spend a lot of time trying to figure that out.
Any suggestions or thoughts are appreciated.
Thank you
Is Lineage More Trouble Than It's Worth?
Oct 24, 2006Very often during dev. I add processes that don't change the metadata of a data item (for example a new sort) yet the linieage id is changed. This causes lots of headaches down the pipe. If metadata of a data item is not changed in the pipe, why is the lineage id changed?
If lineage is not smart enough to figure out when some metadata was actually changed, should it be made smart enough? Or optional?
Ken
Keeping 5 Days Worth Of Backups
May 13, 2008Hey all,
I'm trying to set up a backup schedule in SQL 2005 that will keep 5 .bak files within the folder I specify. I can get it to keep one backup only even though I specify that it is to keep 5 days worth of backups. Each backup happens at 12:00 am. I think the problem I may be having is I don't know how to get the maintenance plan to name the file mmddyyyy.bak or whatever it may need to determine that the file is 5 days old. Currently I am specifying a name of gmsqlbackup.bak. Any idea's that may help me out?
Getting The Past 24 Hours Worth Of Data?
Aug 16, 2007I have a need to query my data and return only the last 24 hours (versus last day) worth of data.
My date and time fields are called:
calc_date = the date
Calc_time= the time
RealTime = Calc_date+Calc_time as realtime
I know if I use getdate()-1 that will get me the last day, but I need the last 24 hours. Any ideas on how would I do this?
Which Sort Of Data (from Application Architecture) Point Of View It's Worth To Put In XML Datatype (MS SQL 2005)?
Mar 20, 2008Which sort of data (from application architecture) point of view it's worth to put in XML datatype (MS SQL 2005)?
View 2 Replies View RelatedNormalization
Aug 17, 2004Hi all,
I am still confuse in normalization. (1st, 2nd, 3rd, and more.)
Any body have a detail idea abt that ???
Pls explain with example.
Thxs.
Regards,
Shailesh Patel
Normalization
Nov 6, 2000Is it possible to normalize a database using SQL statement? I have a huge duplicated records on a certain fields and need to do some normalization on it. For example, the raw data below
Field_A Field_B Field_C Field_D Field_E
1 0001 00/05/11 14.00 Start
1 0001 00/05/11 15.00
1 0001 00/05/11 16.00 End
1 0002 00/05/11 16.10 Start
1 0002 00/05/11 17.50
1 0002 00/05/11 17.10 End
should be normalized to
Field_A Field_B Field_C Duration(End-Start)
1 0001 00/05/11 16.00-14.00=2.00
1 0002 00/05/11 17.10-16.10=2.00
How can I do it using a SQL Query?
Andy
Help With Normalization
Jan 15, 2008Hi all,
Does anyone know of a good resource or tutorial that teaches you the basics of the 3 normal forms?
Muchos Gracias
Please Look @ My Normalization
Mar 6, 2008I'm working on a normalization for one of my classes and I've been sick and I feel lost now, could one of you please look at my database statements and tell me if/what is wrong with it?
FIRE_REPORT(FireID,Alarms,Address,FiremanID,FiremanName,FiremanPhone,FiremanHomeStation,StationAddress,StationPhone,TruckID,License,TruckHomeStation)
I came up with..
TruckID->License,TruckHome
FireID->Alarms,Address
FiremanID->FiremanName,FiremanPhone,FiremanHomeStaion,StationAddress,StationPhone
Which lead to...
FIRE(FireID,Alarms,Address)
FIREMAN(FiremanID,FiremanName,FiremanPhone,FiremanHomeStation,StationAddress,StationPhone)
TRUCK(TruckID,License,TruckHome)
Referencial Integriety Statements
FireID in FIRE_Report must exist in FireID in FIRE
FiremanID in FIRE_Report must exist in Fireman
TruckID in FIRE_REPORT must exist in TruckID in TRUCK
Please, someone tell me if this is right or not. -cheers
Tables Normalization..:(
Apr 14, 2005Hi everyone..
Well i have my tables ready to build the database on to the sql server... My probs is normalization of the tables being used in the database....
Is there any best possible way / [short-cut.. very weird to ask this :) ] using the sql server...?
Advice Normalization
Jun 13, 2005I have a web app which is used to do normal insert/update of employee info. Connected to each employee that is entered is some data that is imported from an outside source for each employee. The question I have is currently my database is very normalized and importing data from this outside source will be quite a pain because of this. Is it bad practice to denormalize a specific table if no user will every insert/update it beside DTS?
View 11 Replies View RelatedTools For Normalization...
Sep 22, 2001What's my question is ? Whether there are any tools available for normalization produced by Database vendors or any third party. If yes, Can u kindly give me clear documentation.
Thanks,
venkat.
venkat_26178@yahoo.com
Whether There Are Any Tools For Normalization..
Sep 22, 2001whether there are any tools for Normalization? If yes, Can u please send some documentation or some reference where I can get them.
-venkat
venkat_26178@yahoo.com
Am I Takin This Normalization Too Far?
Feb 25, 2004Does this show "poor" design? It has been suggested to me to do a "Logical Model" of my data base and that will make it easier to "normalize" the tables. I tried this and come up with the following but I don't know if I am stretching it too thin. One rule of the 2NF is to ensure all tables have a primary key, and as you can see, my tbProjectTeam has a primary key, but that is made up of the entire row. Same goes for the tbDepartmentActivities.
tbEstimatedProjects
Reference (PK) | Name | City | Postal |...
-----------------------------------------------------------
1 | Some Project | Niagra Falls | N8E7J5 | ....
tbAwardedProjects
Project (PK) | Reference
-------------------------
1001 | 1
tbProjectTeam
Project (PK)| Login (PK) | Activity (PK)
-----------------------------------------
1001 | jsmith | Detailer
tbEmployees
Login (PK) | First | Last |......
----------------------------------
jsmith | Jim | Smith |.....
tbDepartmentListing
Login | DeptCode
---------------------
jsmith | ENG
tbDepartments
Code | Department
------------------------
ENG | Engineering
tblDepartmentActivities
Code (PK) | Activity (PK)
----------------------
ENG | Engineering
ENG | Detailer
Am I taking this too far or is the above structure something to be expected by a "good" normalized table structure?
Mike B
Normalization Connundrum
Jul 20, 2005I've come up with this issue in several apps now. There are things that, fromone perspective, are all handled the same, so it would be desirable that theyall be handled in the same table with some field as a type specification.From other perspective of foreign key relationships, however, they aredifferent things and can't be stored in the same table.For example, I have a scheme for indicating mappings between dimension recordsat one time period to new dimension records at another time period. I coulduse one set of tables for all mappings since they all work exactly the sameway, but then I can't set up DRI between the mapping tables and the dimensiontables. If I just make separate mapping tables for each dimension table, thenI'm creating 4 new tables per dimension table, all identical with respect towhat fields they contain, what kinds of unique constraints they have, and whatrelationships they have to each other with the sole distinction that they eachmap to the integer-type key of a different dimension table. I would not lookforward to doing maintenance on this schema!Is there any strategy for having the cake and eating it, too?
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Feb 13, 2008I have 3 code tables :
create table cd_fiq_a
( fiq_id int not null primary key, fiq_name varchar(50) not null)
create table cd_sal_b
( sal_id int not null primary key, sal_name varchar(50) not null)
create table cd_rak_c
( rak_id int not null primary key, rak_name varchar(50) not null)
insert into cd_fiq_a values (1, 'Fiq1')
insert into cd_fiq_a values (2, 'Fiq2')
insert into cd_sal_b values (1, 'Sal1')
insert into cd_sal_b values (2, 'Sal2')
insert into cd_sal_b values (3, 'Sal3')
insert into cd_sal_b values (4, 'Sal4')
insert into cd_sal_b values (5, 'Sal5')
insert into cd_rak_c values (1, 'Rak1')
insert into cd_rak_c values (2, 'Rak2')
insert into cd_rak_c values (3, 'Rak3')
insert into cd_rak_c values (4, 'Rak4')
Now there is a relationship between cd_fiq_a, cd_sal_b and cd_rak_c. For a given Faq there can be one or more records of Sal. For a given Fiq and a given Sal there can be one or more records of Rak.
I am thinking that i can do it one table or two tables:
One Table Solution
----------------------------
create table relation_d
( relation_id int not null primary key,
fiq_id int not null foreign key REFERENCES cd_fiq_a (fiq_id),
sal_id int not null foreign key REFERENCES cd_sal_b (sal_id),
rak_id int not null foreign key REFERENCES cd_rak_c (rak_id),
sort_order int not null )
Two Table Solution
---------------------------
create table relation_header_d
( relation_header_id int not null primary key,
fiq_id int not null foreign key REFERENCES cd_fiq_a (fiq_id),
sal_id int not null foreign key REFERENCES cd_sal_b (sal_id) )
create table relation_detail_e
( relation_detail_id int not null primary key,
relation_header_id int not null foreign key REFERENCES relation_header_d (relation_header_id),
rak_id int not null foreign key REFERENCES cd_rak_c (rak_id),
sort_order int not null )
Which solution is more normalized and will result in better execution of Sql? Or is there any other solution which is more better?
Thanks
Amount Of Normalization
Jun 8, 2007Hello all,
My question concerns the amount of normalization i require for my specific needs. I realize this is a difficult question without knowing alot more about my database. I am hoping with some information I could get advice from those more experienced than I.
- My database consists of 9 tables with the maximim number of columns being 11 which is the contacts table.
- the largest data type is nvarchar 125.
- number of rows in the largest table will eventually grow to hundreds of thousands.
- users access the database online
This is large to me but I expect that to some of you this not.
My application would be easier to setup if the contacts table were to include address info.
So my question is, for a database of this size could I create a contacts table similar to the customer table in the Microsoft Northwind sample data base with the address included, or should I model something more like the contact table in the Microsoft Adventureworks db with the address and State/province split to separate tables.
Any help you could provide with this scetchy info would be greatly appreciated.
Normalization Questions
Oct 18, 2006Hai everybody recently i came across this article and i have tried to answer all the follwoing questions. But i am not sure its correct or not..so you peoples can comment on the follwoing questions.
2)
Employee (ssn, Name, Salary, Address, ListOfSkills)
Yes,
No. Ans: No. as list of skills would be repeated.
3)
Department (Did, Dname, ssn)
Yes,
No. Ans: No. ssn and did should be moved to a seperate table.
4)
Vehicle (LicensePlate, Brand,
Model, PurchasePrice, Year, OwnerSSN, OwnerName
Yes,
No Ans: No.
5)
Employee (ssn, Name, Salary, did) (obs.:
employee can only belong to one department)
Yes,
No. Ans: Yes.
6)
Customer (Cust_Id, Name, Salesperson, Region) where Salesperson
determines Region.
Yes,
No. Ans: No.Salesperson and region should be moved to a seperate table.
7)
Component (ItemNo, ComponentNo, ItemName, Quantity) where ItemNo
-> ItemName
Yes,
No. Ans: No.As itemname is a subset of itemno and not a subset of both itemno and componentno.
A Debate About Data Normalization
May 28, 2008Hi All
Please guide me in the following situation. I am new in programming
I have a master table tblCompany with fields: Company Name, Address, Phone number
Second table is tblUsers with Company Name, User Name , Password
Third table is tblDealing with field Company Name , Dealer Name, Dealer Address
According to the normalization rules I shoud put a column named Company_Id in tblCompany(master table)
and use it in other two tables instead of CompanyName colum to reduce the data retundancy.
But my question is accessing data from master detail tables with join quries will take more processing time(taking the company name against the company ID). On the other hand memory wise its same to store the company ID(like 0012786) and company name (like somecompany Ltd). So should I go for normalization or simply store the Company name in each table.
Thanks
SQL Query Help - - Table Normalization
Jul 20, 2005helloI've a denormalized table PRODUCTS with following fields:ProductNo ,OrderNo ,SerialNo ,OrderDate ,PromiseDate ,ManufacturerID ,......DistributorID ,DealerID ,......ReceiptDate ,......I have to denormalize this table, so I created 3 tables:Table Name : ProductOrdersFields:+ProducrOrderID,ProductNo ,OrderNo ,SerialNo ,OrderDate ,PromiseDate ,ManufacturerID ,-------------------------------Table Name: ProductsOrdersDetailsFields:+ProductsOrdersDetailsID,ProductOrdersID,DistributorID ,DealerID......-----------------------Table Name: ProductsOrdersReceiptsFields:+ProductsOrdersReceiptsID,ProductsOrdersDetailsID,ReceiptDate ,......----------------------------DistributorID and DealerID appear in Details table because aparticular order number for a specific product number can come fromdifferent distributor and dealer.What I need is a query to populate these normalized tables from theoriginal denormalized Products table.Can any one please help?Thanks
View 1 Replies View RelatedData Normalization - Best Approach?
Feb 23, 2006Hi!
I wonder what would be the best (at to be honest - how to do it at all) to perform data normalization with SSIS. The scenario is as follows:
I got plain table with several columns in it.Some of columns can be copied straight into destination tableSome columns (String) should be lookup in another table to get IDOn success just replace string with IDOn fail - create new record in lookup table and return newly created ID
Thanks for any ideas and maybe short samples
Anrijs Vitolins
Normalization,Mappings, Relationships Of Table
May 30, 2008:eek: =>First ,2nd ,3rd normalization
=>Data Integrity
=>Mappings-
1 1:1 mappings
2 1:2 mappings
3 Many :MAny mappings
=>Establish relationship
1.Simple
2.Complex
3. Multiple
Defination of these all or details with subjects also
pls reply me soon
it is urgent for me
thanks in advance
Normalization Question Regarding Column Combinations
Jul 23, 2005We need to store land title information about properties in variousAustralian states, but each state maintains it's own land titleregistry and use different columns (well actually differentcombinations of the same columns). For example:Victoria store:TorrensUnitTorrensVolumeTorrensFolioQueensland store:TorrensCountyTorrensLotTorrensPlanTorrensParishTorrensUnitTorrensVolumeTorrensTitleRefThere are 11 different columns and they are used in 8 differentcombinations depending on the state.Since we need to store information about land in different states I seetwo possible solutions:1. A sparse table containing the 11 columns with a CHECK constraint toenforce the valid combinations.2. A table for each state containing only the columns relevant to thestate with a foreign key relationship to the table containing thecommon columns.I'm not sure if the data type and length is consistent between statesyet (waiting to find this out) but assuming that it is which of theseapproaches is going to be the most rigorous? I'm leaning towards (2)but I don't like the feel of a table per state.
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