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Good Day Ashfield
There are no Duplicates as i said.The Problem is that there was a Unique index on a certain Field.
Thank you i solved the Problem.
Vuyiswa Maseko,
Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.somee.com
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/
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Vuyiswa Maseko wrote: The Problem is that there was a Unique index on a certain Field
.. which means there were duplicate values for this field, otherwise your unique index would not have caused a failure
Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP
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Yes but not in a Row Level. Because the Defination of the Field allowed Duplicates in a Field Level.
Vuyiswa Maseko,
Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.somee.com
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/
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Vuyiswa Maseko wrote: Yes but not in a Row Level
I kind of expected you would look at the fields that form the unique indices, not look for duplicate rows (although obviously they would also cause the problem).
Anyway, all solved now 
Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP
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Thanks i never thought there would be an index there, i just inherited the System. thanks
Vuyiswa Maseko,
Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.somee.com
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/
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Hi all,
I am doing Data Migration using ORACLE and Vb.net 2005. Im transferring Values from one database to another.
Currently,getting values from Source DB and those values are filled in a Dataset,using For loop,the values are inserted into the Destination DB.
The above mentioned method is working fine for Less number of records(500 approx.)
For more than one lakh records,it is not a gud solution. It is taking more than an hour...
How to do BULK INSERTION using ORACLE and VB.NET.
Pls any one help me...
Thanks in advance
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Hi all, i know maybe its is really easy but I've been working on it for ages ! (
Name Diploma year
A 1991
A 1986
A 1981
B 2001
B 1996
B 1992
C 1990
C
C
D 2006
D
D
i have a 3-4 tables and join them, then it returns lots of people have diplomas from different
school, but i need to show the last graduated school for everyone. like that
A 1991
B 2001
C 1990
D 2006
.
.
.
.
.
thanks for now ...
Talha
thanks for everything i have...
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select max(diplomayear),[name]
from mytable
group by [name]
Hope this will help you.
I Love T-SQL
"Don't torture yourself,let the life to do it for you."
If my post helps you kindly save my time by voting my post.
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thank you, it works !
thanks for everything i have...
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No problem.
I Love T-SQL
"Don't torture yourself,let the life to do it for you."
If my post helps you kindly save my time by voting my post.
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Hi
I have a stored procedure with an input parameter varchar.
I am passing the parameters from UI to stored procedure by looping through the parameters and making them as string and passing to stored procedure. now i want to execute this where clause in select query.
the input parameter is like this
@value = 'statusid=2 or statusid=3 or statusid=4'
select * from table1 where @value
i dont know how query the dynamically generated where.
Kindly help. Thanks in advance
Naina
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Hello Naina,
You can use EXEC statement to execute your dynamic query inside your stored procedure....
Refer the exeample below...
CREATE PROCEDURE dbo.sproc_SampleProc
@strTableName VARCHAR(100),
@strColumnNames VARCHAR(255) --Can be comma seperated column names...
AS
BEGIN
SET NOCOUNT ON;
DECLARE @strDynamicQuery VARCHAR(500)
SET @strDynamicQuery = 'SELECT '+@strColumnName+' FROM '+@strTableName
EXEC (@strDynamicQuery)
END
GO
Enjoy Programming !!!
Robin
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CREATE PROCEDURE dbo.spSelectData
@whereConditions VARCHAR(max)
AS
BEGIN
declare @selectqeury as nvarchar(max)
set @selectqeury='SELECT * from mytable where '+ @whereConditions
exec (@selectqeury)
END
Hope this will help you.
I Love T-SQL
"Don't torture yourself,let the life to do it for you."
If my post helps you kindly save my time by voting my post.
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This is a very bad SQL programming technique. Read about the poor performance and dangers of SQL Injection. Since T-SQL can handle a long parameter list, use that instead.
CREATE PROCEDURE X (p01 INTEGER, p02 INTEGER, ..p99 INTEGER)
AS
BEGIN ..
SELECT ..
FROM ..
WHERE p IN (COALESCE (p01, 0), COALESCE (p02, 0), COALESCE (p99, 0)zzz0;
.. END;
There are better ways to write this in SQL-2008 and Standard, but the idea is to build a one-coolumn table from parameter and remove the NULLs. Also, by definitio, there is no such thing as a "status_id"; nan attribute can be an identifier or a status, but not both at once.
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You may have better luck just using a parameterized command rather than a stored procedure.
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Hi
I am using MS Access 2003 as database and also as front end. I want to open crystal reprot on MS Access form using coding in access. I want to open report when a buton on form is clicked.
I m searching for this but could not find the solution
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You're more than likely going to have to use VBA to accomplish this task.
I believe that you would be better served creating your reports by using Crystal Reports to hit the MS Access db than the way you seem to be approaching this problem. YMMV.
"My interest is in the future because I'm going to spend the rest of my life there." - Charles F. Kettering
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The mans a masochist, Access AND Crystal Reports, what a nightmare.
Never underestimate the power of human stupidity
RAH
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I have a product table with 100000 products and also I have a user table with 5000 records. and suppose a user can give us feedback about any combination of this products. So suppose he chooses to compare products 1,3,100,200,400,500 and so on. (he can send us another feedback about some other products)
So here is my question, I just want to know what an expert database designer would think about this situation where the number of products and users are big. One way to store this ratings are in a single string like: 1#5 3#4 100#5 .... x#y means that he gave y stars to product with id of x. I can load this vote_string in my php script for example and extract the details of it.
So the rating table would likely have this structure: id, user_id, vote_string
Another way is to store this feedback in this structure:
vote Table: id, user_id, date
vote_details Table: vote_id, product_id, vote ==> (vote_id,products_id) as primary key and vote_id is foreign key.
(or may these 2 tables can be compressed in a single table like id,user_id,product_id,vote [id,user_id,product_id] as primary key)
So i guess it's very easier to query in the second design but it consumes more space and time for each query, also in case of product deletion it's quite better to use the second design. What would you do?
Any kind of idea is appreciated.
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All you need is a single votes Table: user_id, date, product_id, vote
And never store something that isn't a string in a string!
Luc Pattyn [Forum Guidelines] [My Articles]
The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.
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I'd go with Luc's suggestion, it's spot on for what you need.
Would the string be able to handle the pathological case where a user rates every single product in the db?
Not likely but there are some strange people out there. 
Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis
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The first option is definitely NOT viable, you will never be able to query the product/vote value.
Your 2nd option is technically correct, if you need to manage the instance of a user/vote event then the 2 table structure saves you storing the userid and date multiple times and is therefore technically correct.
If you do not need to manage the vote event (when did user x vote) then you can use Luc's suggestion. Personally I would use your 2nd structure but them I'm a pedant where data is concerned having been bitten by lousy design in the past.
Never underestimate the power of human stupidity
RAH
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I don't mind a little pedant discussion, so here it goes.
For a simultaneous vote on N products the one-table approach takes N records of 4 fields each; the two-table approach takes N records of 3 fields each plus one record of 3 fields.
So the storage break-even would be where 4N=3N+3, hence N=3 (that is assuming IDs and dates have same cost). Therefore the 2-table approach would save space only for N>=3. How likely that is depends much on the correlation between products, and the kind of GUI used for voting.
Also selecting/searching/ordering the votes would take an extra join in the 2-table approach.
Having heard no real arguments in favor of 2-table (e.g. "we expect users to vote on an average of 5 products), I would call it over-normalized; to carry it somewhat further, one could come up with 3 tables, by listing all (product_id, vote) combinations in a third table. That would favor situations where some products always get high votes, and others always get low votes. However there are no facts to justify this approach.
Hence I'm with Einstein, who said something along the line "the simplest approach that covers it, is the right approach" or was it "you should simplify as much as possible, but no more". So I'll stick with the 1-table design.
Cheers.
Luc Pattyn [Forum Guidelines] [My Articles]
The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.
modified on Sunday, July 19, 2009 12:23 AM
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Luc Pattyn wrote: So the storage break-even would be where 4N=3N+3
I don't think the storage size/fields is relevant these days, I was focused more on the normalisation issue of storing redundant data.
I don't agree with the over normalised point although the additional join has it's issue. Trying to get the number of times a user has voted from the single table structure would be more difficult than with the 2 table approach. I know it was not requested but I can hear his manager (or marketing) asking for the information about 3 weeks after the thing goes live and while the solution is trivial it does highlight the issue.
Nope I'd go for the 2 table approach but acknowledge that neither structure is perfect, thats where the art comes in and while my design may not suit all it would suit me.
Never underestimate the power of human stupidity
RAH
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