Dtabase Design For Storing True/false Questions
Feb 12, 2007
Hai,
I am trying to design a database for storing trule/false questions.
I have no need to store any thing like chapters are topic. I want to just design a bare minimum tables for just storing questions and its responses.
So does the following tables and fields suffice to achieve that?.
Questions_table(id(autogenerated),course_id,Questi on(text type))
id field uniquely identify each question, course_id(ex:CRS235) is used to identify which course a particular question belongs to, and Question filed store actual question.
Response_table(id,response)
Response field is of int type, 1 for correct answer, 0 for wrong answer. I am not storing options for each question because every question has same options that is True/False.
So, will this work. Please advice and I would appreciate if any one can point me to a good resource on the web.
Thanks,
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Jul 31, 2015
I have a cube that has a Dimension set up with several values some of which are bools. While Browsing in Excel or SSMS, two new values, when used as a filter shows (All) (Blank) and (True) for selections instead of (All) (True) and (False).
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Oct 20, 2007
I have a stored procedure that has a boolean (bit) field passed to it (@emailcontract). If a user checks the check box on the webform I would like my where to return only the records where the email_contract column is true. If they don't check the check box I would like it to return records where email_contracts is true or false.
What would my where cluse look lile for this?
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May 13, 2007
All
Can I ask what data type i use for a true false response (Boolean) in my table?
Thanks
Gibbo
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Mar 20, 2008
Hi,
I need to check the existence of a row in a table.
So i am using an if condition
like
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[CheckNOAStages]
@NOAID int,
@StageCode nchar(20)
AS
BEGIN
SET NOCOUNT ON;
Declare @Count int
Select @Count =Count(NOAId) from NOAStages where NOAID=@NOAID and StageCode=@StageCode
if (@Count>0)
Begin
return 1
end
else
begin
return 0
end
END
The stored proc is executing but on the Data Access Layer
I have this
Boolean exists = Convert.ToBoolean (Execute.ExecuteReader(spCollection, dbSQL));
Some how I am always getting false . How can I fix this?
Thanks
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Oct 29, 2007
Hello
I am exporting an SQL Server table to a comma delimited text file. The values of Columns defined as Bit are exported as "True" or "False", but I would like that in the file appear 1 or 0 instead (with no surrounding double quotes). How can I acomplish that?
I tried using a Transformation and convert to single byte unsigned integer, but True values are exported as "255" and False values as "0". Why?
Thanks a lot.
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Aug 15, 2005
Hi there, I've tried googling this (and looking at the many questions on the forum :) but I've not managed to find a decent tutorial / guide that describes a method for using checkboxs to insert true/false flags in a MS SQL db. The db field i'm setting has type set to "bit", is this correct? And secondly (its been a long day!) I just cant figure out the code to assign the bit 1 or 0 / true or false. This is what I've got so far but it's not working........Function InsertProduct(ByVal prod_code As String, ByVal prod_name As String, ByVal prod_desc As String, ByVal prod_size As String, ByVal prod_price As String, ByVal prod_category As String, ByVal aspnet As Boolean) As Integer Dim connectionString As String = "server='server'; user id='sa'; password='msde'; Database='dbLD'" Dim sqlConnection As System.Data.SqlClient.SqlConnection = New System.Data.SqlClient.SqlConnection(connectionString) Dim queryString As String = "INSERT INTO [tbl_LdAllProduct] ([prod_code], [prod_name], [prod_desc], [prod_size], [prod_price], [prod_category],[aspnet]) VALUES (@prod_code, @prod_name, @prod_desc, @prod_size, @prod_price, @prod_category, @aspnet)" Dim sqlCommand As System.Data.SqlClient.SqlCommand = New System.Data.SqlClient.SqlCommand(queryString, sqlConnection) sqlCommand.Parameters.Add("@prod_code", System.Data.SqlDbType.VarChar).Value = prod_code sqlCommand.Parameters.Add("@prod_name", System.Data.SqlDbType.VarChar).Value = prod_name sqlCommand.Parameters.Add("@prod_desc", System.Data.SqlDbType.VarChar).Value = prod_desc sqlCommand.Parameters.Add("@prod_size", System.Data.SqlDbType.VarChar).Value = prod_size sqlCommand.Parameters.Add("@prod_price", System.Data.SqlDbType.VarChar).Value = prod_price sqlCommand.Parameters.Add("@prod_category", System.Data.SqlDbType.VarChar).Value = prod_category If chkAspnet.Checked = True Then sqlCommand.Parameters.Add("@aspnet","1") Else sqlCommand.Parameters.Add("@aspnet","0") End If Dim rowsAffected As Integer = 0 sqlConnection.Open Try rowsAffected = sqlCommand.ExecuteNonQuery Finally sqlConnection.Close End Try Return rowsAffected End Function Sub SubmitBtn_Click(sender As Object, e As EventArgs) If Page.IsValid then InsertProduct(txtCode.Text, txtName.Text, txtDesc.Text, ddSize.SelectedItem.value, ddPrice.SelectedItem.value, ddCategory.SelectedItem.value, aspnet.value) Response.Redirect("ListAllProducts.aspx") End If End SubAny help would be appreciated or links to tutorials.ThanksBen
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Jun 10, 2008
Sir
I want to Return 1 and 0 after update , delete , Insert statement
IF Records Effected Return 1 else return 0
Pls help me out .........Sir
Yaman
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Nov 19, 2007
I want to pass a single char to a query and use that to set two flags.
(
@ID int,
@AssessedID int,
@CompetencyID int,
@Status char,
@Creator int
)
AS
UPDATE P4_Assessment
SET P4_Cancelled_f = (@Status = ('C')),
P4_Competent_f = (@Status = ('P')),
P4_Date = getdate(),
P4_Creator = @Creator
WHERE P4_ID = @ID
I want to set the P4_Cancelled_f to true (if @Status = 'C') or false if it doesn't.
This sort of syntax is fine in C#, but fails in a query. I also tried using IN (@Status IN ('C'))
Is this sort of logic possible in TSQL or should I use two parameters and set them in my code as 1 or 0?
TIA
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Apr 5, 1999
I need a way to test if a convert function will work before I process it. if it fails, I want to intercept the error and return my own error to the front end
ex
if convert(int,@x) is true then do; else do
please email me if anyone has some advice
Mike
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Jul 3, 2014
Actually title should be returns true when should false.
I want to check a table to see if a record already exists, if it doesn't then insert it, else do nothing:
IF NOT EXISTS
(SELECT 1 FROM Table1 WHERE col1 = 'Test')
BEGIN
INSERT INTO Table1 (col1) VALUES ('Test')
END
The value 'Test' is already in the database yet, the code is saying it's not and trying to insert it, resulting in duplicate key errors.
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Jun 12, 2008
When I enter a a true or false value into a boolean field, what is the proper way to enter it? I'm using:
INSERT INTO tblTable (IsSomething)
VALUES (False)
I've heard that a better way is to use 1 and 0, or something.
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Jan 7, 2004
Hi everyone.
I've got a Select query that pulls out some data from my database. Two of the columns are both booleans (bit's of size 1) so they come back as TRUE and FALSE - which I thought was fine.
However, the users are wanting to see YES and NO since they find TRUE and FALSE confusing (yes I know how silly that sounds).
Is there any way I can do this?
My query is like this:
SELECT [stuff], [things] FROM [table1], [table2] WHERE [table1].[condition] = [table2].[condition]
Thanks
Andrew
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May 12, 2008
Hi,
I'm using SSIS to update the destination table.
Both servers are running identical SQL Server 2005 versions.
I want to copy data and replacing existing data WITHOUT dropping the destination table first.
The SSIS package works when:
1) DropObjectsFirst = TRUE
2) CopyData = TRUE
3) ExistingData = REPLACE
The SSIS package does not work when:
1) DropObjectsFirst = FALSE
2) CopyData = TRUE
3) ExistingData = REPLACE
The error I get is the "destination table already exists". Of course, it already exists. I just want to copy/update the destination table. So, why does SSIS insist on dropping the table first?
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May 14, 2015
It is my understanding that when having LinkedServers, the option "enable promotion of Distributed Transactions for RPC" should be set to TRUE, so we can rollback , if needed, remote transactions. At least, that's my understanding of that setting.
Having said that, the TRUE setting is affecting this particular TSQL code, inside an sproc, which I would prefer not to alter:
Insert into #TempTable
EXEC ServerB.MyDatabase.MyStoreProcedure
@param1= '',
@param2= ''
When set is set to TRUE (current setting) I get this error:
OLE DB provider "SQLNCLI11" for linked server "ServerB" returned message "The partner transaction manager has disabled its support for remote/network transactions.".
Msg 7391, Level 16, State 2, Line 28
The operation could not be performed because OLE DB provider "SQLNCLI11" for linked server "ServerB" was unable to begin a distributed transaction.
... when set to off, the error goes away.
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May 25, 2006
I am using Naive Bayes, Decision Trees, and Neural Net (SSAS 2005) to predict which of two states each record belongs to.
How can I enforce a different penalty for a false positive versus a false negative ? (I am assuming that in some sense the mining algorithms can then minimize the total penalty).
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Mar 16, 2006
I'm new to database design and i need som advice concerning the design of my tables.
What I want to accomplish is this:
A attendace tracking system that allows tracking of meeting attendance. The project manager is setting up a meeting and after the meeting was held he/she reports who in the project team was at the meeting. It should then be possible to track the meeting attendance of the different team members.
I have a table containing the data for the team members and i thought of adding an "attended meetings" field but the field is actually a number of fileds depending on how many meetings the person has attended so far. How do I accomplish the described functionality?
Can someone pleas give me some advice
Thanks
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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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May 17, 2008
Hey guys, this is my first post here. I just joined recently and I am loving the videos as they've really helped me step into ASP.NET and VB. Just some background, I used to be a CS major several years ago and programmed in Java and C, though I only went through 2 years before I moved majors. I didn't like the focus of my universities program, and decided to pursue other options. Ironically, I am now delving back into programming, but with a focus on web development, hence learning VB and ASP.NET. Anyways I am developing my first web application and I needed some help.Basically, what the program does is allow users to login to this web site and then store private information, which they can then access at a later time from any computer that is connected to the web. I have already setup user membership by following the video (lesson 8 of the ASP.NET series - Securing your Web site with Membership and Login Controls) from the Learnvisualstudio.net series. I can login to my site just fine, as well as creating a new user etc. The next step is designing the SQL database, and setting up the page that retrieves a users data, allowing them to view the private information they've stored, as well as to edit, create, and delete information.Unfortunately, while I can see the broad method of doing this, I am a bit lost in actually implementing it. The first stumbling block I am coming across is the SQL database itself. I have attached an image of how I have the database designed so far. Note that the aspnet_user table is the one that ASP.NET creates automatically when you enable membership controls and such.So basically, a user logs in, and they are greeted with a list of all of the "stickies" they have created. Each sticky has a title, as well as up to 4 fields, and you can enter the name of the field, as well as enter the actual data. It's foreign key ties back to the UserId that ASP.NET already created. The user can also organize their stickies into categories, hence that table. The Settings table will be where a users settings will be saved, such as which view mode they prefer etc. At this stage of development, that table is un-important and un-developed.So on to some of my questions. As it is designed now, there will be one table with every users stickies, as well as categories, and when a user logs in, the program will look at the category and stickies tables, and grab the ones that are associated to the users UserId. So one of my first questions is; is this a good design? I ask this from a security standpoint as well as a speed and efficiency standpoint. I want this site to be able to support at least 50,000 to 100,000 users, each with any number of "stickies" and "categories" With that size of a user base, would each user be looking at massive load times because the program would have to go through a very large table to grab only the ones that are linked with the users UserId? Say I have 50,000 users, and each user has 5 "stickies", that means that my user_stickies table would have 250,000 rows of data, and the program would be trying to find only 5 of those. Is this a really inefficient way of doing this? Should each user have their own category and stickies table? If so, how would I go about doing this? And in that case, instead of having a couple giant tables, my SQL DB would instead have a ton of tables, is this even any better?I have other questions, but I guess I'll start with this. What are your guys' thoughts? I am a newbie, so this may be a silly set of questions. I try to read up and research as much myself as I can, but sometimes you have so much information thrown at you at once its hard to grab out the specific answers you need.
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Dec 6, 2004
I’m trying to design a database that allows the users to give each individual client/company unlimited addresses and salutations. I can build the design that accommodates this, but I cannot figure out how to handle them knowing which salutation to use with a mailing they might do to the clients.
I have put the Company Name and Position (title) in the address table so that when doing a mailing the company name and title are associated with the company address being mailed too. But again, I’m not sure how they would choose a salutation if they have many choices.
Looking for any of your thoughts or suggestions.
Thank you,
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Jan 19, 2004
Hi,
I designed the database and there are two points I'm not sure that my design was correct:
1) In my search engine (in interface) i have an expression builder and user can save the expression he created. In this case don't chreate view in database, but I have a table named "Expressions" which saves expression name and expression. The reason I made it was: If I create view it doesn't make db to work faster because the select query in view runs every time when view was opened, but it makes my code more generic . But isn't it a design error?
2) I save 3 reserved fields in each table, and I don't know if I'll use them some day. The reason: adding a column to database is heavy operation. But isn't it a design error?
Thank you for advice
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Apr 24, 2007
I have a few questions here about designing a database:
1. What is normalisation and de-norminalisation?
2. A quote:
normalisation has a series of steps (or rules) called forms the more steps you take, the more normalised your tables are......If you use the first 3 steps you would say that the tables are in their Third normal form
What is all that about - whats forms got to do with tables or what is he trying to say in the above quote?
3. When would you decide to create a new table in a database - i.e. what rules does everyone follow to say "ok i better capture this data in a new table and create a relationship to another table"
Thanks in advance
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Jul 19, 2007
Hello,
I'm trying to use Visio 2003 Enterprise Architect version to do a basic dB table design. Can someone please help me out with the following questions:
1) how can I set a column to "auto-increment", with a seed value, and the increment amount?
2) once I've drag and dropped an Entity from the stencil onto the design surface and selected it, what is the difference between:
a) clicking on a column name, select Edit, select Check tab, and enter the check constraints, versus
b) clicking on "Check" under Categories, select Add (actually I'm not quite sure what to add here)
Thanks
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Jul 20, 2005
Hello gurus:Hopefully someone can shed some light on some questions I have. I amtasked to build an application that will schedule and track tasks. Ifirmly believe in not reinventing the wheel however also feel thatcustomizing is certainly not out of the question.I am looking to build something in ASP (or .NET) that can allow anindividual to work "disconnected" from the network while stillaccessing a database (MSDE?) that will sync with SQL 2000 oncere-connected. I have built multiple db apps that are strictly webbased and consider myself somewhat knowledgeable (read.. dangereous)SQL/ASP dude. I understand that for a stand-alone client app I mayhave to use .NET and load the framewsork on the client in order to runthe dynamic pages for database updates. Here are my questions:1) Is there a way for SQL server to "replicate" its tables into aschema/data recognized by MSDE (i.e. generate the "mother ship" tablesand schema first, then use SQL Server to automatically create (export)the client MSDE tables)2) are there tools to manage MSDE so one can see what the heck is inthere? I understand Enterprise manager will not work in this regard.3) Are there any resources (documents, tutorials etc..) for datareplication (i.e. dbsync from MSDE up to MSSQL and vice-versa)4) Am I wasting my time doing this from scratch because there isalready something out there that does all this that is moderatelypriced and customizable?Thanks for your attention and consideration.Eric B
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Dec 2, 1998
I have to move a database to a different server. Is it possible to move all users accounts also.
Could the sysusers or syslogins table to moved via bcp ????
another method ??
Thanks
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Mar 22, 2000
One of our clients controls data for about 150 companies. Each company has the same schema and is running SQL Server 7. The maintenence task is horrible. He would like to put all the data in one large database, but needs to control the access, so a user at one company selecting data in a table cannot have access to another company's data in the same table. I thought about using views for each company but that is 150 companies times 100 tables. With Oracle8i you can make virtual private databases. Can this be done in SQL Server 7? Thanks in advance
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Jun 14, 2001
Hi,
I want to know how to connect to informix from SQL server and how can I run queries for the tables in Informix from sql server.
Thanks
Arun
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Oct 26, 2007
By default, distribution database is set to simple recovery mode. Why ? Should this be changed to full ? how often should transaction logs be taken ? What is the recommendation ?
Thank you
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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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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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Jun 21, 2006
I have a table by the name of Info, in this table I have columns with the following names FirstName, LastName, PhoneNumber, CustomerID. In the columns I have the following data
FirstName = Beth
LastName = Riddle
PhoneNumber = 864-555-1212
CustomerID = 4
The problem is with the following statement in the .vb file. The statement keeps produceing a false value, when the desired value is Beth.
TextBox1.Text = SqlDataSource1.SelectCommand = "SELECT 'FirstName' From 'Info' Where(PhoneNumber = '864-555-1212')"
Please help
Thanks for the information
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Oct 12, 2006
when ever i drop a ole db source or destination control on data flow, upon clicking to edit it complains about -- defaultcodepage is set to false. When i check in the properties and set it to true; i get no error. What is it all about?
kushpaw
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Mar 6, 2008
greetings
i am use this query to select the primary field colums in a table
"select Column_Name as PrimaryKeycolumn
from INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE TABLE_NAME = 'tbl_Activity'
and Constraint_Name like 'PK_%'"
but i want to select the fields which have a nullable=false
for that i want know the information schema for null
thank u
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