Problem With Picking The Right Algorithm

Feb 8, 2007


I'm using SQL Server 2005. The problem I have is as follows. I have several production lines and as with everything parts in the line tend to break. I have data from all the breaks that occurred in the last 2 years. What I want to do is predict the next break and the production line it's going to happen on. I would also like to go to a future date and check what possible breaks might occur on that date. I've run quite a few models but none of them helps me with future events. I think I might be using the wrong algorithm or I€™m just not doing it right. If somebody can please suggest an algorithm and maybe help me with a web site that has a tutorial similar to my problem


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Picking Out Duplicate Records

Mar 19, 2008

Hi, I have a student results table with the layout shown below (four records with the fields separated by dashes). Sorry its so messy. Anyway, you can see that there are duplicates. I want to write an SQL statement that will pick out only the 'supplemental' records if duplicates occur. Any ideas on how to do this?

ID - StudentNo - Subject - Term - Yearofstudy - YearTaken - Grade
1195- 11111111- MA1E2- Annual - 1- 2006- 34
1205- 11111111- MA1E2- Supplemental- 1- 2006- 40 (S)
1194- 11111111- MA1E1- Annual -1- 2006- 35
1204- 11111111- MA1E1- Supplemental- 1- 2006- 40 (S)

Here is the SQL I'm using to get all the records from the studentresults table, for first years only:

FROM studentresults
WHERE studentresults.StudentNo = 11111111 AND studentresults.YearOfStudy = 1

How do I change this to pick out only the supplemental exam results?



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Picking A Representative Subset?

Feb 5, 2013

The problem is to find a subset of rows such that each value in each of two columns (animals and food brands in this example) appears in at least one row. The purpose is to produce a set of samples from a large table. The table has a animal_name column and an food_brand column; I want a set of samples that contains at least one of each animal_name and at least one of each food_brand, but no more than necessary.

CREATE TABLE Feeding_Options
animal_name VARCHAR (10) NOT NULL,
food_brand VARCHAR(15) NOT NULL);
INSERT INTO Feeding_Options
(6401715, 'rat', 'IAMS'),


To frame the problem better, her are the values in each column:

animals = {'rat', 'dog', 'cat', 'fish', 'fox'}
food = {'IAMS', 'Sci Diet', 'Purina', 'Alpo'}

In this data, (6401715, 'rat', 'IAMS') and (1058337, 'rat', 'IAMS') are interchangeable, as are some of the other rows. There can be more than one minimal solution whcihmight be the whole set.

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Picking Records Having Both Of Two Criteria

May 14, 2008


Slightly knotty and hard-to-articulate problem here, so please bear with me.

As part of a series of transactions, I have a table which contains data which looks like this:

AdBookingID adWeeks AdID clientId valueid
----------- ----------- ----------- ----------- -----------
97336 3 95127 248 1007
98220 1 94304 458 1007
98220 1 94304 458 7610
98386 1 88123 319 7604
98388 1 91484 319 7610
98390 1 91963 319 7610
98392 1 92468 319 7601
98392 1 92468 319 7608

The key to this problem is the "valueID". The first digit of the value is significant - the "1" and the "7" in the above mean the values are parts of different groups of search criteria.

What I need to do is to select from this list into a temp table all those bookings (identified by AdBookingID) which have valueIds of both types - i.e. an row in the table where the valueId starts with a 1 and a row in the table where the valueId starts with a 7 - in the above data sample the only AdBooking which qualifies is 98220.

I worked out a method of doing this going by the number of entries each item had in the table:

select count(distinct valueId)
as valueId, adWeeks, clientId, adID, AdBookingID
into #worktable
from #tmp
group by adWeeks, clientId, adID, AdBookingID
having count(distinct valueid) > 1

Which is largely accurate. But - and here's the killer - although each adBooking can only have one valueId starting with 1, it can have multiple entries starting with 7. These bookings are rare, but they do exist and are causing anomalies in the data returned which - if you recall - must only contain booking records for which there are valueId entries with both a 1 and a 7.

Can anyone suggest a way I can get just the data I need?

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Picking The Specific Data

May 16, 2007

I have in my table something like this
Col1 Col2
6 O
6 O
6 C
6 C
6 C
5 O
5 O

i want the value as 6 iff all the corresponding
records in col2 are C
similarly, since for 5 there are no C it should
not pick record 5

Please suggest me a query for this

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SQL Server Not Picking Up New NTLogin Name

Oct 11, 2007

Can anyone suggest an alternative to the following problem?

We have had 2 users change their NTLogin in AD. For example, from jsmith to jbloggs. NB this is a change, NOT a completely new login. When the users connect to sql server and call the function SYSTEM_USER, the login returned is the old login:


This is causing an audit trail problem. Exactly the same issue exists with sys.sysprocesses.

The only way I have found of correcting the problem is by restarting the SQL server service which is obviously not ideal for such a trivial issue.

You can recreate this problem via local users on a sql box as well:

1. Create a local user on the SQL box called FirstUserName and grant access to SQL
2. do a runas on management studio and runas the FirstUserName user
3. connect to SQL and run SELECT SYSTEM_USER, you will get [nameofsqlbox]FirstUserName which is correct
4. kill management studio
5. rename the user SecondUserName
6. do a runas on management studio and runas the SecondUserName user (note, same user, now has different login name)
7. connect to SQL and run SELECT SYSTEM_USER, you will get [nameofsqlbox]FirstUserName which is now incorrect
8. restart sql server service
9. connect to SQL and run SELECT SYSTEM_USER, you will get [nameofsqlbox]SecondUserName which is now correct

Any solutions other than just sucking up a restart everytime a user changes login name would be much appreciated!

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Picking Up Data Meant For Many People

Nov 29, 2007

Hi,I have a gridview on a page, which should select data from a database. I want it to select the data row if it finds its UserName in the UserName column, but there will be many usernames in the username column, seperated by commas.Here is the select statement that I have at the moment, which doesnt return any data atall:SELECT [message], [senddate], [subject], [messageid], [sendername], [recievername] FROM [Messages] WHERE ([recievername] LIKE '% ' + @recievername + ' %')@recievername = Profile("UserName") which is the vwd wizards way of saying the current user. A Username column has data like this:bezzer , bezlan , beezer , beezler with a space between commas and a space at the start and the end.Thanks if someone can help!Jon  

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WHERE Clause Not Picking Up 2nd Field Criteria

Jun 20, 2001


I have this SP that works, except I need to add another field value for the WHERE clause. As you can see I have "WM" but I need to add "PR", and those two are definitely in the table field. I've tried a variety of syntax arrangements using the AND operator, the OR operator, the & operator, just a comma between the two, nothing between the two. Can someone please show me what I'm doing wrong. It fileters for "WM" fine, but I also need it to filter in the WHERE clause for "PR". Here is the SP:

CREATE procedure spDemoSchedule (@beginDate varchar(10), @endDate varchar(10), @storeNum int)

SELECT Progstats.[Program#], Progstats.KCKOFF, Progstats.ProgramName, Progstats.Parent, Store.[Str#], Store.Status, Progstats.Dept, Store.[Program#], Product.[Item#], Product.[Item]
FROM Progstats INNER JOIN Product ON Progstats.[Program#] = Product.[Program#] INNER JOIN Store ON Progstats.[Program#] = Store.[Program#]
WHERE Progstats.KCKOFF BETWEEN @beginDate AND @endDate AND Store.[Str#]=@storeNum AND Progstats.CLASS="WM"

Bruce Wexler

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Transact SQL :: Picking Up Average Last Two Payments

May 18, 2015

Got a table named Payments in the following form:


The Customers Table have the fields:


Since the Customers Table contains the complete list of customers I seek to have a Join made between it and the Paymentstable to check the amount made by the customers.

However, the trouble arises when I seek to check the average amounts made by each customer during last two months in which such a customer had paid.

In further clarification, lets consider current month of May 2015 going on;

Customer_A had paid $10,000 in AprilCustomer_A had paid $5,000 in AprilCustomer_B had paid $10,000 in AprilCustomer_A had paid $18,000 in MarchCustomer_A had paid $2,000 in MarchCustomer_A had paid $10,000 in FebruaryCustomer_B had paid $8,000 in FebruaryCustomer_B had paid $4,000 in FebruaryCustomer_B had paid $3,000 in February...

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2 Structural Questions For Picking Field Type

Jul 25, 2006

Hi all,

Hi am creating a new database not sure which way is the best way to go. Here are the questions

I have a history table which has its an identity field and an identification field which shows what type of history field it is. As in payment, printout, change and so on.... For this field should i use
Full text which has the payment, printout, change and so on and make it easy on the eye and for queries and coded to use the same text all the time
have varchar(2) type of field which holds an understandable field PR, PO, CH and a reference table for it as in PR= PAYMENT, PO = Printout, CH as in change and so on
or have a integer field as in 1, 2, 3 and ref. table 1=payment, 2 = printout, 3=change and so on
I have a address table which holds multiple types of addresses which are really limited count maybe upto 4 different types
have a integer field which links to a reference table as above
have bit fields which can be used to check if it gets in one of the group types
have a full text option like above
Im open for any type of suggestions and i would love to hear the reasons why its picked TY

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Picking A Data Source File From Configuration

Mar 7, 2008

Hi there,
I believe this is simple requirement but to me it seems to be complicated. My data source is excel. I would like to configure the path of my data source in SSIS Package and file name is not a constant value. SSIS package should pick the file named as Today's (current) date from the configured path. As well, package should catch the exception for example file not found and log into custom log. It would be gr8 if some body helps me out.

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Package Not Picking Up Latest Config File Changes

Nov 7, 2006


I've created a solution with 5 packages in. I've scripted a config file for each package where I would be able to change the source file connection and the database servers (source and destination). On the first package, I am able to change the config attributes and the affects are picked up, but the rest of the packages do no pick up the changes.

For example, if the source file is "C:Filessource.txt" and this is changed to "C:Filessource123.txt" (Just to make sure it fails) it wont pick up the new changes and still uses "C:Filessource.txt".

Also, I tried changing the name of config file itself and the package still ran as if nothing had changed. It's as if it's not recognising the config file.

Any ideas ?

Thanks, Richie.

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Report Not Picking Up Custom Style Sheet OR HtmlViewer.css Changes

Feb 27, 2007

I cannot seem to get the report to pick up the custom style sheet I placed into Reporting servicesReportServerStyles subdirectory. Nor will it pick up any changes to the HTMLViewer.css either. The report obviously isn't looking there perhaps? I've used the http: etc. ReportServer/Pages/ReportViewer.aspx?%reportname%&rs:Format=HTML4.0&rs:Command=Render&rc:StyleSheet=MyStyleSheetname

I've even modified the HTMLViewer.css file as well. Nothing. Nada. Is there somewhere else this is cached? Or some way I can find where the report looks for this?

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Integration Services :: For Each Loop Container Is Not Picking Up CSV Source File

Jul 2, 2015

My package is having .csv file as a source and I kept OLEDB destination to load it.

Stored the .csv file in a shared folder and the exact path is given in Enumerator configuration of the foreach loop container. When I execute my package, it is giving the warning as below:

It is saying that file is not there in the specified path and directory is empty. I am running the SSIS package from TFS. I am sure that I have read and write access for the shared folder for my userID. Is there any access there to pick up this file from path.

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SQL Server Admin 2014 :: Picking Static Port Number For Named Instance

Apr 3, 2015

Basically the question is, which number should I pick?

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SQL 2012 :: Picking Number String Out Of Text String

Jul 14, 2015

I have a text field which has entries of variable length of the form:


I'm trying to pick out the numbers between resultid='...',clientip no matter what the rest of the string looks like. So in this example it would be the numbers:


the part of the string of the form resultid='...',clientip always stays the same except the length of the number can vary.

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May 22, 2002

Does any have a algorithm that can divide A into B without using the divide
sign (/) or the multiplication sign ( * ).

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What Is The Best Algorithm To Use?

Nov 24, 2006

I am new to DM and I am not sure which algorithm would be best to use.

I am trying to build a custom comparitor application that companies can use to compare themselves against other companies based on certain pieces of information. I need to group a company with 11 other companies based on 6 attributes. I need the ability to apply weightings to each of the 6 attributes and have those taken into consideration when determining which 10 other companies each company is grouped with. Each group must contain 11 members, the company for the user logged in and 10 other companies that it will be compared against.

At first I thought that clustering would be a good fit for this but I can not see a way to mandate that each cluster contain exactly 11 members, I cannot see a way to weight the inputs, and I think each company can only be in one cluster at a time which do not meet my requirements.

Any help will be greatly appreciated!

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Jun 8, 2006

Well, i have read in claude seidman book about data mining that some algorithm inside in microsoft decision tree are CART, CHAID and C45 algorithm. could anyone explain to me about the tree algorithm and please explain to me how the tree algorithm used together in one case?

thank you so much

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Luhn Algorithm

Dec 11, 2006

Use this to check if Luhn has valid check digitCREATE FUNCTIONdbo.fnIsLuhnValid
@Luhn VARCHAR(8000)

IF @Luhn LIKE '%[^0-9]%'

@Multiplier TINYINT,
@Sum INT,

SELECT@Index = LEN(@Luhn),
@Multiplier = 1,
@Sum = 0

WHILE @Index >= 1
SELECT@Plus = @Multiplier * CAST(SUBSTRING(@Luhn, @Index, 1) AS TINYINT),
@Multiplier = 3 - @Multiplier,
@Sum = @Sum + @Plus / 10 + @Plus % 10,
@Index = @Index - 1

Peter Larsson
Helsingborg, Sweden

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Jul 23, 2005

Hello,Do you know if the algorithm for the BINARY_CHECKSUM function in documentedsomewhere?I would like to use it to avoid returning some string fields from theserver.By returning only the checksum I could lookup the string in a hashtable andI think this could make the code more efficient on slow connections.Thanks in advanced and kind regards,Orly Junior

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Algorithm Of The MAX Command In T-SQL

Dec 7, 2007

What kind of algorithm does the MAX command uses? I have a table that I need to get the last value of the Transaction ID and increment it by 1, so I can use it as the next TransID everytime I insert a new record into the table. I use the MAX command to obtain the last TransID in the table in this process. However, someone suggested that there is a problem with this, since if there are multiple users trying to insert a record into the same table, and processing is slow, they might essentially come up with the same next TransID. He came up with the idea of having a separate table that contains only the TransID and using this table to determine the next TransID. Will this really make a difference as far as processing speed is concerned or using a MAX command on the same table to come up with the next TransID enough? Do you have a better suggestion?


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Neural Net Algorithm

Sep 15, 2006


Would anyone be able to provide a reference paper on the neural net algorithm implemented in SQL Server 2005 to better understand how it works?

Thanxs for any info.

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Clustering Algorithm

Oct 29, 2007

Hi All!

I have few questions regarding Clustering algorithm.

If I process the clustering model with Ks (K is number of clusters) from 2 to n how to find a measure of variation and loss of information in each model (any kind of measure)? (Purpose would be decision which K to take.)

Which clustering method is better to use when segmenting data K-means or EM?

Thanks in advance!

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C# Algorithm/ Libraries

Jan 10, 2006


Does anyone know of or where I can find implementation of these C#  algorithm /class libraries:

a) RLS - Recursive Least Square algorithm?

b) MWAR - Multi-resolution Wavelet Auto-regresive algorithm?

c) AR - Autoregresive moving awerage algorithm?

d) EWMA - Exponentially Weighted Moving Average

The .NET framework System.Math class do not seem to have these libraries. 



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Which Algorithm Is Best For Perdiction

Jul 12, 2006


I want to predict which product can be sold together , Pl help me out which algorithm is best either association, cluster or decision and pl let me know how to use case table and nested table my table structure is


Rajesh Ladda

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Problem With AES_256 Algorithm

Feb 14, 2008

i am using sqlserver2005 as back end for my project.
actually we developing an stand alone web application for client, so we need to host this application in his server. he is not willing to install sql server 2005 edition in his sever so we r going by placing .mdf file in data directory of project.

but before i developed in server2005 i used aes_256 algorithm to encrypt n decrypt the pwd column by using symmetric is working fine.

but when i took the .mdf file of project n add into my project it is throwing error at creation of symmetric key that
"Either no algorithm has been specified or the bitlength and the algorithm specified for the key are not available in this installation of Windows."

please suggest me a solution

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Developing A New Plug-in Algorithm

Feb 7, 2008


i'm making my master thesis about a new plug-in algorithm, with the LVQ Algorithm.
I make the tutorial with the pair_wise_linear_regression algorithm and i have some doubts. i was searching for the code of the algorithm in the files of the tutorial and i didn't saw it. I have my new algorithm programmed in C++ ready to attach him, but i don't know where to put him, in which file i have to put him to start to define the COM interfaces? And in which file is the code of the pair_wise_linear_regression algorithm in the SRC paste of the tutorial?


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Algorithm : Data Mining

Feb 26, 2007

Hello friends,

Can u give some idea about the Algorithm in Data Mining for Clustering..

Please reply...


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Time Series Algorithm

Aug 17, 2006

I am trying to predict Revenue gererated by each Person.
My Input like this:

Month Person Revenue

20050101 Person1 $1000
20050101 Person1 $2000
20050201 Person1 $1000
20050101 Person2 $5000
20050201 Person2 $2000
20050201 Person2 $3000

Obviosly for Person1 and 200501 I expect to see on MS Time Series Viewer $3000, correct?
Instead I see REVENUE(actual) - 200501 VALUE =XXX,
Where XXX is absolutly different number.

Also there are negative numbers in forecast area which is not correct form business point
Person1 who is tough guy tryed to shoot me.
What I am doing wrong. Could you please give me an idea how to extract correct
historical and predict information?

Thnak you,

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Which Algorithm To Be Used With Symmetric Keys

Mar 28, 2006


I want to create a symmetric key that will be encrypted by certificate key. Can u guide me which algorithm is best out of the following:

DES, TRIPLE_DES, RC2, RC4, RC4_128, DESX, AES_128, AES_192, AES_256.

I tried using AES_128, AES_192, AES_256 but it says 'the algorithm specified for the key are not available in this installation of Windows.'

Pls tell me which else algorithm is best to use and pls specify why.



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Which Algorithm Is Better For Customer Retention

Jul 25, 2006


Pl any one tell me which algorithm is better for Customer retention Using SQL server 2005 analysis services

It will be great if some one can give the same with example of data model with key column , and rest

Thanks in Advance

Rajesh Ladda

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Questions About Microsoft_Linear_Regression Algorithm

Jul 2, 2007

Currently I want to run a vanilla multivariate regression and get some statistics back about the regression that is built. For instance, besides the coefficients, I also want the two-sided p-values on the coefficients and the R2 of the model.

I've tried playing with the Microsoft_Linear_Regression algorithm and have run into two issues. I'm doing all this programmatically using DMX queries rather than through the BI studio.

(a) I can never get the coefficients from the regression to match with results I would get from running R or Excel. The results are close but still significantly off. I suspect this is because the Linear Regression is just a subset of the Decision/Regression Trees functionality, in which case some kind of Bayesian prior is being incorporated here. Is that the issue? And if so, is there some way to turn off the Bayesian scoring and get a vanilla multivariate regression? I don't see anything in the inputs to the linear regression that would let me do this, and even running Microsoft_Decision_Trees with a few different settings, I can't get the output I'm looking for. If there's no way to turn off the Bayesian scoring, can someone explain to me what the prior being used here is and how Bayesian learning is being applied to the regression?

(b) Using the Generic Tree Viewer, I see that there are a few "statistics" values in the Node_Distribution, but I'm not sure what they're referring to. One of them looks like it might be the MSE. I could play with this some more to find out, but I'm hoping someone here can save me that work and tell me what these numbers are. Hopefully they will constitute enough information for me to rebuild the p-values and the R2.



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