Designing A Database Within A Database... Design Question Storing Data...
Jul 23, 2005
I have a system that basically stores a database within a database (I'm
sure 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 a
column of type nvarchar(4000), but I want to add support for unlimited
text. I want to do this in a smart fashion. Right now I am leaning
towards putting 2 nullable Value fields:
ValueLong ntext nullable
ValueShort nvarchar(4000) nullable
and dynamically storing the info in one or the other depending on the
size. ASP.NET does this exact very thing in it's Session State model;
look at the ASPStateTempSessions table. This table has both a
SessionItemShort of type varbinary (7000) and a SessionItemLong of type
Image.
My question is, is it better to user varbinary (7000) and Image? I'm
thinking 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 benifit
of using varbinary and Image datatypes? If it's just to allow saving of
binary data, then I don't really need that right now (and I don't think
ASP.NET does either). Are there any other reasons?
thanks,
dave
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Dec 29, 2006
Hello there,I just want to ask if storing data in dbase is much better than storing it in the file system? Because for one, i am currenlty developing my thesis which uploads a blob.doc file to a web server (currently i'm using the localhost of ASP.NET) then retrieves it from the local hostAlso i want to know if im right at this, the localhost of ASP.NET is the same as the one of a natural web server on the net? Because i'm just thinking of uploading and downloading the files from a web server. Although our thesis defense didn't require us to really upload it on the net, we were advised to use a localhost on our PC's. I'll be just using my local server Is it ok to just use a web server for storing files than a database?
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Feb 18, 2008
Hi All,
I am attempting to create a Visual C++ application based on displaying financial charts and am using SQL Express to store Stock information such as the Exchanges the stocks are traded on, the indicessectors they belong to and the Closing prices for as long as I can download data for. I am not proficient in C++ nor SQL and am using this project to learn both languages as well as making myself rich beyond my wildest dreams.
I have "designed" a database with the following tables:
tblDate_ 1 column clmDate (Primary Key, smalldatetime, NOT NULL)
tblStockExchange_ 4 column clmStockExchangeID (PK, int, NOT NULL)
clmParentID (int, null)
clmStockExchange (nvarchar(50), NOT NULL)
clmMarkets_ (FK, nchar(20), NOT NULL)
tblMarkets_ 1 column clmMarkets (PK, nchar(20), NOT NULL)
tblIndices_ 1 column clmIndices (PK, nchar(50), NOT NULL)
tblSectors_ 1 column clmSectors (PK, nchar(50), NOT NULL)
tblMarkets_Sectors 3 columns clmMarkets_SectorsID(PK, int, NOT NULL)
clmMarkets_ (FK, nchar(20), NOT NULL)
clmSectors_ (FK, nchar(50), NOT NULL)
tblSecurities_ 4 columns clmEPIC (PK, nchar(10), NOT NULL)
clmSecurity_Type (nchar(5), NOT NULL)
clmSecurty_Name (nchar(50), NOT NULL)
clmSectors_ (FK, nchar(50), NOT NULL)
tblSecurities_Indices 3 columns clmSecurities_IndicesID (PK, int, NOT NULL)
clmEPIC_ (FK, nchar(10), NOT NULL)
clmIndices_ (FK, nchar(50), NOT NULL)
tblSecurities_Date_OHLCV 8 columns clmOHLCVID (PK, int, NOT NULL)
clmEPIC_ (FK, nchar(10), NOT NULL)
clmDate_ (FK, smalldatetime, NOT NULL)
clmOpen (float, NOT NULL)
clmHigh (float, NOT NULL)
clmLow (float, NOT NULL)
clmClose (float, NOT NULL)
clmVolume (float, NOT NULL)
Why so many tables? perhaps you should put some more in...
This was the only way I could work out how to store one-to-one and one-to-many relationships required for:
- Many closing prices for many stocks
- Stocks belonging to many indices
- Stocks belonging to only one sector
- Stocks belonging to only one market (MainMarket or AIM for LSE)
- Stocks belonging to only one Exchange (I am aware of dual listed stocks but one thing at a time)
Why nchar's and not nvarchar's?
Because I didn't realise the benefits of nvarchar's until recently. How can I change this a loose the extra spaces in the cells.
Why do some tables have IDs and others don't?
I decided to put ID columns in for tables that didn't have obvious Primary Keys - if someone could explain the advantages if ID columns I would be grateful.
To the SQL Professional's eye there will be some obvious things wrong with this design and your criticism is welcome. The database I have is achieving what I would like it to do; I can plot charts using the data but I have ran into problems when trying to create a TreeView control which is what I would like to use as a navigational tool in my application.
It would seem that pulling hierarchal data from a relational database, to pass to the TreeView control, is a tricky task to say the least. I have found many articles online which discuss how to do this (using an Adjacency List Model or Nested Set Model) but they define a fairly simple example at the beginning (based on fruit or electrical goods) but don't appear to talk about gathering data from an existing relational database or changing an existing relational database so that it is more suited to storing hierarchal information. I have Joe Celko's - Tree and Hierachies in SQL for Smarties but sadly this fine material is a little beyond me!
I would like the hierarchy to look like this:
StockExchange
Market
Sector
Stock
Indices
Sector
Stock
I have written three queries to get the StockExchangeMarketSectorStock information individually from each table but am struggling with ways to put all the rows together, add left and right values (Nested Set Model) then run queries against this to get individual nodes to pass to the TreeView control. Therefore is there something I need to add to the original design?
Any help would be greatly appreciated.
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Mar 5, 2008
Can I know answer of this question ? in detail explanation.
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Oct 15, 2007
Hey all, I have a form in one page and when the user clicks the submit button it has to save the data into my SQL database which i have created.It doesnt show any error and it successfully redirects to another page but not saving the data .Could someone help please.Here is my code under submit button SqlDataSource txtDataSource = new SqlDataSource(); txtDataSource.ConnectionString = ConfigurationManager.ConnectionStrings["LocalSqlServer"].ToString(); txtDataSource.InsertCommandType = SqlDataSourceCommandType.Text; txtDataSource.InsertCommand = "INSERT INTO Hamburgdata(user_name, report_type, company_name , street_address, city, state, zip_code, tax_ID) VALUES (@user_name,@report_type,@company_name ,@street_address,@city,@state,@zip_code,@Tax_ID)"; txtDataSource.InsertParameters.Add("user_name", User.Identity.Name); txtDataSource.InsertParameters.Add("report_type", ReportType.Text); txtDataSource.InsertParameters.Add("company_name", CompanyName.Text); txtDataSource.InsertParameters.Add("street_address", StreetAddress.Text); txtDataSource.InsertParameters.Add("city", City.Text); txtDataSource.InsertParameters.Add("state", State.Text); txtDataSource.InsertParameters.Add("zip_code", ZipCode.Text); txtDataSource.InsertParameters.Add("tax_ID", TaxID.Text); int rowAffected = 0; try { rowAffected = txtDataSource.Insert(); } catch (Exception exp) { } finally { txtDataSource = null; } } ThanksVik
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Aug 2, 2007
I am working on a project, which involves displaying trends of certain aggregate values over time. For example, suppose we want to display how the number of active and inactive users changed over time.
One issue is how to store historical data. First of all, should I create a separate database for each historical snapshot or should I use one database for all snapshots? Second, our database size is a couple of gigabytes and replicating the entire database on a daily basis is not feasible. An alternative solution is to back up aggregate values, but how do I back up results of aggregate queries, where the user can specify a date range in the WHERE-clause? Another solution is to create fact tables from our relational schema and back those up.
Another issue is how to query historical data. Using multiple databases to store historical snapshots makes it harder to query.
As you can see there are several design alternatives and I would like to know how this sort of problem is generally solved in the industry. Does SQL Server provide any support for solving this problem?
Thanks.
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Aug 1, 2001
Is it possible for retriving data from a remote Sql server database and storing it in a local sqlserver database.
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Apr 5, 2004
Friends,
Who is responsible for the Design of Database? System Analyst, DBA, Databse Designer, Project Leader? Coz I am working as a System Analyst, but now desgining the Databse for the ERP package which I feel is another man's work. Confussed. Plz help me.
Anil
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Jan 7, 2007
Hi there ,1. i have a database and i want to encrypt my passwords before storing my records in a database plus i will later on would require to authenticate my user so again i have to encrypt the string provided by him to compare it with my encrypted password in database below is my code , i dont know how to do it , plz help 2. one thing more i am storing IP addresses of my users as a "varchar" is there a better method to do it , if yes plz help me try { SqlConnection myConnection = new SqlConnection(); myConnection.ConnectionString = ConfigurationManager.ConnectionStrings["projectConnectionString"].ConnectionString; SqlDataAdapter myAdapter = new SqlDataAdapter("SELECT *From User_Info", myConnection); SqlCommandBuilder builder = new SqlCommandBuilder(myAdapter); DataSet myDataset = new DataSet(); myAdapter.Fill(myDataset, "User_Info"); //Adding New Row in User_Info Table DataRow myRow = myDataset.Tables["User_Info"].NewRow(); myRow["user_name"] = this.user_name.Text; myRow["password"] = this.password.Text; // shoule be encrypted //not known till now how to do it myRow["name"] = this.name.Text; myRow["ip_address"] = this.ip_address.Text; myDataset.Tables["User_Info"].Rows.Add(myRow); myAdapter.Update(myDataset, "User_Info"); myConnection.Close(); myConnection.Dispose(); } catch (Exception ex) { this.error.Text = "Error ocurred in Creating User : " + ex.Message; }
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Jun 9, 2004
Hi all,
Does anyone know how I can design the database schema. I mean what tools can be used to the design the database and view the table relationships, etc. TIA.
Vik!
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Dec 5, 2005
One interviewer has asked me the following question:
What are the things that you consider while designing database?
I have told about integrity constraints, and normal forms.
but he has added 15 more concepts like
1. indexers
2. Table columns
3. Table rows
4. search facilities
6.......
Can any one give full Idea on this question?
Thanking you Ashok kumar.
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Nov 22, 2005
Hi,
My current project requires me to convert a mysql based software to a more generic one. I started by designing separate db class files and separated the lower level connection queries from the business logic. By doing this, I now have mssql.class, mysql.class, sqllite.class etc..
But am not sure how to handle sql functions in queries. For instance, one of my queries need the use of a date function to add minutes to a db field.
In mysql, I accomplish this using
dbfield+interval '$arg' minute between date1 and date1
But in mssql I cannot use this type of query. It seems I'll have to use date_add() function. How do I handle this situation?
My frontend scripting language is php
Thanks d'advance
Celia
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Feb 26, 2004
Case 1:
A company is involved into e-commerce..hosting multiple websites for different products.
CAse 2:
The above scenario could also be implemented with a single site having multiple products for sale.
For Case 2 one would go for a single database for all the products.
While for CAse 1 ,a separate Database is developed for each Site.
What I fill is CAse2 is a more appropriate choice even if we have multiple sites for different products.
This would help us in rapid development of any ecommerce site...
ANd better ERP management for the Company.
I would appreciate some expert guidelines for the above scenario
Thanx in Advance
Warm Regards
Girija
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May 27, 2006
Hi...
I am making a online job portal....for dat i need to make a gud database.
wud anybody be kind enuf to provide or tell me how to make a good database design...
thnx..
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Jul 20, 2005
Dear All,How to reach to the highest level of normalization for database designing?Guide Lines Needed.What will be the characteristics of a database of a completely normalized databae?Check List needed.ThanksSuryaPrakash Patel****************************************** This message was posted via http://www.sqlmonster.com** Report spam or abuse by clicking the following URL:* http://www.sqlmonster.com/Uwe/Abuse...118039e018ee088*****************************************
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Jul 20, 2005
Dear ReaderI am trying to design a database. How can I make best Judgement that Indexing (which I am trying to fix during Diagram Desingning process)is ok.I am able to identify the best candidate for the indexing.Below is the details I want to understand:AreaZIPCityCountyDistrictState/ProvinceCountryNow I want the data retrival optimization through Index. (you can suggest another idea, also)Entities Area,...., Country have independent tables.Example:Area_TableAreaID (PK)AreaThey have relationship- one to many- if you go from Country to Area.There is one more table:Location_Table (PK)LocationIDAreaIDZIPIDCityIDCountyIDDistrictIDState/ProvinceIDCountryID(Location_ID is further related to the Address of the contact.)GUI has a single form to enter these details.On a save command details in all the tables -Area to Country- (individually) being inserted.& simultaniously Location_Table is also being inserted with the details.Following is the situation of being queried these tables:(1) GUI user can select an Area than the related details of ZIP .., ..., ...upto Country etc. should be loaded automatically (id it is previously stored by the user entry in the database.)(2) Contacts have to be retrived on the basis of Area, ZIP, .....County. (Necessary Groupings are required )Example:If Contacts are queried Country Wise then the Display should beCountry1State1District1County1City1ZIP1Area1Area2ZIP2City2County2District2Country2Please Guide.SuryaPrakash****************************************** This message was posted via http://www.sqlmonster.com** Report spam or abuse by clicking the following URL:* http://www.sqlmonster.com/Uwe/Abuse...0255a1765491f15*****************************************
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Apr 4, 2008
Hey guys,
So I started an SQL CE database for use inside a mobile application. I used SSMS to create a .sdf file (because if I let Visual Studio do it, SSMS can't open it because it will be version 3.5).
The reason I wanted to use SSMS is because I wanted to be able to design the database in design view, and populate it with initial information for the application to use. That means adding tables and rows.
The problem is, SSMS doesn't seem to have a design view available when working with CE databases. It also doesn't seem to have a feature for adding rows into tables. It's essentially as useless as VS2008 for designing my mobile database. It only lets me add tables, and I can't even do that visually in design view. I have to use those cumbersome forms.
Is there any way to design a CE database in design view? And add rows of data into tables? It feels like I'm overlooking something.
Note: I dont need to subscribe or publish the database. The mobile application just needs to use the database as a repository.
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Mar 17, 2008
Hello guys, I am a hobbyist programmer and now that I have started asp.net, I was wondering about the correct way to enter data into a table. For example, i have a table called players with a field called status. What should I code the status as? "Active" or "Retired" or 1 and 0? I thought using 1 and 0 would be better as far as database size, but it is pretty difficult to understand how to modify the gridview. I come from PHP and everything is a lot more accesible there as far as modification of output. Thanks in advance!
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Oct 1, 2007
I've done some basic database design in the past, but am a relative newbie to design. I have recently come across a situation I'm not sure how to handle. Here's the situation...
Assume we've got a contacts table which holds information about our contacts. All contacts have the same basic information - name, address, telephone, etc. Each contact is of a certain type - let's just say a, b, and c, for ease. This contact type is stored in the contacts table. Now, on contacts of type b, I also have to store some additional data. What it is doesn't really matter. I found a way to set this up, but I'm not sure that I'm going about it the right way, and would love some advice on the proper way to do this. Basically, what I did is create my contacts table:
Contact_id, contactName, ContactAddress, ContactPhone, ContactType.
Created a contacttype table
ContactType, ContactTypeDescription, ContactAddInfo
What I've done is left contactaddInfo as a nullable field. When it has a value, that value is the name of a table which holds the additional information that I need for the contact... So when I'm running a query, I can tell if I need to reference another table by checking the value of ContactAddInfo.
I can't imagine that this is the best solution, but it was the first thing that popped into my head, and it's a really small database that's using it. However, I'm now being faced with the same situation in a much more important, larger database, and I'd love to know the 'right' way.
Thanks for any guidance you can provide!
Erin
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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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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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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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Jul 20, 2012
best way to store questionnaire data in a database.Since different questionnairs have different questions and formats i.e dropdown, radio, checkboxes etc building such a database model becomes highly complex.
I've read that if data schema is complex and higly variable it may be better to use an xml document and store that in a databse. However I dont quite understand how you store xml to a database. Do you simply store the entire structure in something like a nvarchar column or is there some other way to store xml to a database.
If you store the entire structure to the databse then how do you query the content to generate reports.
example xml:
Code:
<survey>
<meta>
<id>sample</id>
</meta>
<questions>
<question id="1" type="singlechoice" page="1">
[code]...
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Nov 25, 2003
Does anyone currently do this. I want to store an audit history for changes made in the database through our web application.
I would like some kind of history table structure. I would be interested to see if anyone else has done this and what your structure looks like.
ScAndal
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Jan 13, 2004
I have a bit of a dilema, that maybe someone can give a reccomendation on. I have a vb app that will calculate a duration that a process runs in hours:minutes:seconds. My question is should I store this in the database as a date/time field or calculate total seconds and store it as an integer field? I will be using this field for basic summing calculations in the future. Thanks for any help.
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Feb 24, 2004
Hello-
Im currently storing an account id in a sql table. Is there any column data type that would presere the numbers but make it appear as a series of letters and nmumbers when someone looks at the database table?
If not can someone give me a strategy
thx
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Dec 22, 2000
Hi,
can we keep a file like word file or html file in the sql server database?
if yes, then can we search any thing in these stored file?
regards
mihir
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Dec 15, 2004
How do you store an image in a database? I know this is not the preferred method for storing images but would like to know anyways…thanks.
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Sep 22, 2004
hello ... i have a project this semester and i had to study is storing images in a database ( using Microsoft Access ) is good or bad ? so any one could tell me the advantages and the disadvantages please ...
thanks
bye
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Oct 6, 2005
An odd question from me, I know, but this time, I assure you a twist.
I have a group that wants to store images in either a database or a file share, in order to make a certain website able to run on a load balanced web farm. These images are around 1KB each in size, and have a lifespan of exactly one use (think of graphs). I went a-googling, and found no shortage of articles that say "don't do it, but here's how you can do it", but I did not find any real hard statements as to why to not do it. Needless to say, this is hurting the case for not putting these images in the database. I have found an article that says images over 8KB will have worse performance, but I can not use that factoid here. For the moment, I have the developers leaning toward the fileshare, because they will be writing transaction logs all day, which will be more work than the fileshare needs to do....I think. The best I can do, is cut the text/image datatype overhead, and have them create the table as varbinary(2000), but even then, I don't like the look of the idea.
Anyone out there have good articles/whitepapers that detail the differences between writing single-use images to a fileshare vs. a SQL database? <baiting=blatant>Failing that, do any of the Microsoft development team have an opinion?</baiting>
Alternatively, what is the general opinion of keeping session state information in a database (because I bet that will be my next battle). I see .NET includes a session state server, but not being a programmer, I can not create an opbjective test.
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