Question On Dealing With Missing Values For Training Models
Jul 19, 2007
Hi, all,
Just really wonder what is the good idea to deal with missing values? Should we leave the missing values there in the traning data set ? Or replace it with other values?
What I am really concerned is that if we simply replace those missing values with other values, then how will it really affect the correctness of the training models?
I am looking forward to hearing from you for the above issue and it will be really great if we have any kind of best practices of dealing with this issue.
Thanks.
With best regards,
Yours sincerely,
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Sep 18, 2006
Q1. Model Prediction -- Suppose we already have a trained Microsoft Linear Regression Mining Model, say, target y regressed on two variables:
x1 and x2, where y, x1, x2 are of datatype Float. We try to perform Model Prediction with an Input Table in which some records consist of NULL x2 values. How are the resulting predicted y values calculated?
My guess:
The resulting linear regression formula is in the form:
y = constant + coeff1 * (x1 - avg_x1) + coeff2 * (x2 - avg_x2)
where avg_x1 is the average of x1 in the training set, and avg_x2 is the average of x2 in the training set (Correct?).
I guess that for some variable being NULL in the Input Table, Microsoft Linear Regression just treat it as the average of that variable in the training set.
So for x2 being NULL, the whole term coeff2 * (x2 - avg_x2) just disappear, as it is zero if we substitute x2 with its average value.
Is this correct?
Q2. Model Training -- Using the above example that y regressed on x1 and x2, if we have a train set that, say, consist of 100 records in which
y: no NULL value
x1: no NULL value
x2: 70 records out of 100 records are NULL
Can someone help explain the mathematical procedure or algorithm that produce coeff1 and coeff2?
In particular, how is the information in the "partial records" used in the regression to contribute to coeff1 and the constant, etc ?
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Sep 18, 2006
Q1. Model Prediction -- Suppose we already have a trained Microsoft Linear Regression Mining Model, say, target y regressed on two variables:
x1 and x2, where y, x1, x2 are of datatype Float. We try to perform Model Prediction with an Input Table in which some records consist of NULL x2 values. How are the resulting predicted y values calculated?
My guess:
The resulting linear regression formula is in the form:
y = constant + coeff1 * (x1 - avg_x1) + coeff2 * (x2 - avg_x2)
where avg_x1 is the average of x1 in the training set, and avg_x2 is the average of x2 in the training set (Correct?).
I guess that for some variable being NULL in the Input Table, Microsoft Linear Regression just treat it as the average of that variable in the training set.
So for x2 being NULL, the whole term coeff2 * (x2 - avg_x2) just disappear, as it is zero if we substitute x2 with its average value.
Is this correct?
Q2. Model Training -- Using the above example that y regressed on x1 and x2, if we have a train set that, say, consist of 100 records in which
y: no NULL value
x1: no NULL value
x2: 70 records out of 100 records are NULL
Can soemone help explain the mathematical procedure or algorithm that produce coeff1 and coeff2?
In particular, how is the information in the "partial records" used in the regression to contribute to coeff1 and the constant, etc ?
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Jul 2, 2007
I am in the process of creating an Integration Services package to automate the process of training mining models and getting predictions. Until recently, I have been processing the models directly from Business Intelligence Studio without any problems. However, when I try to use the exact same training set as an input to the Data Mining Model Training destination, I get several errors. Here is the output:
[Mining Models [1]] Error: Parser: An error occurred during pipeline processing.
[Mining Models [1]] Error: Errors in the OLAP storage engine: The process operation ended because the number of errors encountered during processing reached the defined limit of allowable errors for the operation.
[Mining Models [1]] Error: Errors in the OLAP storage engine: An error occurred while the 'CPT MODIFIER' attribute of the 'BCCA DMS ~MC-CLAIM LIN~5' dimension from the 'BCCA LRG DMS TEST' database was being processed.
[Mining Models [1]] Error: File system error: The record ID is incorrect. Physical file: . Logical file: .
[Mining Models [1]] Error: Errors in the OLAP storage engine: The process operation ended because the number of errors encountered during processing reached the defined limit of allowable errors for the operation.
[Mining Models [1]] Error: Errors in the OLAP storage engine: An error occurred while the 'BILL TYPE' attribute of the 'BCCA DMS ~MC-CLAIM LIN~5' dimension from the 'BCCA LRG DMS TEST' database was being processed.
[Mining Models [1]] Error: File system error: The record ID is incorrect. Physical file: . Logical file: .
[DTS.Pipeline] Error: The ProcessInput method on component "Mining Models" (1) failed with error code 0x80004005. The identified component returned an error from the ProcessInput method. The error is specific to the component, but the error is fatal and will cause the Data Flow task to stop running.
I have not been able to find an answer as to why this is happening. I found a post regarding a similar problem with processing an OLAP cube in SSIS, but it seems that the author of that post never found an answer. Has anyone else here seen similar errors when processing mining models from Integration Services?
Also, if I process the mining models manually then try to run only predictions in SSIS, I get many of the same errors. I'll keep looking into the problem myself, but I would be very grateful if someone in this forum could shed some light on this issue.
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Jul 9, 2007
I want to skip running the SSIS data flow task when the source file is missing. We have a scheduler that copies the source file to the staging area. This SSIS package runs as SQL server job. So when a SSIS package fails due to missing file the remaining steps in the SQL scheduler won't execute. I want to handle the missing source file condition grace fully. Please advise.
Thanks in advance.
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Nov 24, 2006
Hi, all here,
Thank you very much for your kind attention.
I am wondering if it is possible to use SSIS to sample data set to training set and test set directly to my data mining models without saving them somewhere as occupying too much space? Really need guidance for that.
Thank you very much in advance for any help.
With best regards,
Yours sincerely,
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Jul 31, 2006
hi ive got a inert sub where i grab values from text boxes etxthe values are passed to a stored procedure however , one of these fields is a date field , but the field is not required ...so on this line if the date text box is left blank i get an error , not a valid date .Parameters.Add("@actiondate", SqlDbType.DateTime).Value = txtActionDate.Texti have tried ( the actiondate field can take nulls ..)if txtActionDate="" then .Parameters.Add("@actiondate", SqlDbType.DateTime).Value = nothing else.Parameters.Add("@actiondate", SqlDbType.DateTime).Value = txtActionDate.Textend if but this doesnt workwhat is the best way of allowing blank values to be passed to the stored procedure( it doesnt fall over with normal text / varchar fields ) thanks
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Apr 2, 2007
Hi EveryoneVery new to .net and currently dipping my toes in the water with a small application, but getting to the point -
I have a form which has somel text fields that expect a date but which are not a required field so in other words the user can leave them blank.
The code behind page stores the information using a stored procedure which I add parameters to in the following fashion -
SqlParameter userdate = new SqlParameter();userdate .ParameterName = "@dtdate";userdate .SqlDbType = SqlDbType.DateTime;userdate .Direction = ParameterDirection.Input;userdate .Value = dtdate.Text.ToString();cmd.Parameters.Add(userdate);
Now if I leave the text field dtdate blank I receive an error because the above expects a date.
If I remove the line userdate .SqlDbType = SqlDbType.DateTime; I don't recieve an error but my stored procedure saves the date as 01/01/1900 or similar.
I believe this is because in my stored procedure the paramger dtdate is defined as @dtdate datetime
Obviously I want to have it so that if the user leaves the text field empty then no date is saved in the database and was wondering how other people tackle this scenario.
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Oct 29, 2004
I have a table that keeps track of click statistics for each one of my dealers.. I am creating graphs based on number of clicks that they received in a month, but if they didn't receive any in a certain month then it is left out..I know i have to do some outer join, but having trouble figuring exactly how..here is what i have:
select d.name, right(convert(varchar(25),s.stamp,105),7), isnull(count(1),0)
from tblstats s(nolock)
join tblDealer d(nolock)
on s.dealerid=d.id
where d.id=31
group by right(convert(varchar(25),s.stamp,105),7),d.name
order by 2 desc,3,1
this dealer had no clicks in april so this is what shows up:
joe blow 10-2004 567
joe blow 09-2004 269
joe blow 08-2004 66
joe blow 07-2004 30
joe blow 06-2004 8
joe blow 05-2004 5
joe blow 03-2004 9
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Jan 7, 2007
Hello all and a happy new year!
I used Microsoft clustering for grouping my data. Even though i already cleaned the data and have no null values i get one cluster with missing values in every attribute. (i set CLUSTER_COUNT=3 and i'm using Scalable k-means algorithm)
Does "missing" mean that the algorithm cannot group that particular tuple in another group so it consider it as missing?
Thank you in advance.
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Mar 7, 2008
I have two columns, where I have the start and stop numbers (and each of them ordered asc). I would like to get a query that will tell me the missing range.
For example, after the first row, the second row is now 2617 and 3775. However, I would like to know the missing values, i.e. 2297 for start and 2616 for stop and so on as we go down the series. Thanks in advance to any help provided!
StartStop
---------
20452296
26173775
568936948
3727084237
84409178779
179013179995
180278259121
259292306409
307617366511
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Nov 16, 2015
I have table with column having values 1,2,3,5,6,10.
I want to get the missing values in that column between 1 and 10 i.e., min and max... using sql query.
I want to get the values 4,7,8,9.
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May 16, 2008
I've got a field that might have spurious values in it (say, an admin adds a new row but doesn't have an entry for this field).
I'm trying to swap in the string no_image_EN.jpg if the value in the db does NOT end in .jpg. That way, any value rreturned is either a valid filename or no_image
I'm having trouble with the CASE statement, particularly testing just the last few cahracters of the string:
select product_code,
CASE can_image_en
?? When (can_image_en LIKE '%.jpg') then can_image_en
Else 'no_image_EN.jpg'
End as can_image_en,
none of these do the trick either (some are bad syntax obviously):
? When (can_image_en LIKE '%.jpg') then can_image_en
? When LIKE '.jpg' then can_image_en
? When '%.jpg' then can_image_en
? When right(can_image_en,4) = '%.jpg' then can_image_en This is the one that has correct syntax, though it seems to return false in ALL cases CASE can_image_en
When '%.jpg%' then can_image_en
Else 'no_image_EN.jpg'
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May 29, 2012
We are facing the following issue, several machines/users that are executing very often a command similar to :
INSERT INTO TableName (FieldOne,FieldTwo) VALUES ('ValueOne','ValueTwo');
SELECT SCOPE_IDENTITY() AS Table_ID;
Where TableName has a primary key defined as identity(1,1).and that Table_ID is being used as reference in others tables
These queries are executed using different dababase users and among several diffrent apps..The Problem is that we are detecting lost block of "Table_ID's" as the other tables shows the InsertedID as a reference, but the TableName table lacks of this ID record. In other words, the INSERT seems to work, the SCOPE_Identity returns an InsertedID, and the other tables are populated using this number. However, when we query the TableName table the mentioned record does not exist. We are profiling the server and we're sure that there are no DELETE statement on the TableName table. This seems to be happening when the are either deadlocks or blocked processes. Whenever the deadlocks and locks disappear/solved, everything works as expected.why the Scope_Identity returns the Inserted ID if the INSERT action had failed.
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Jan 15, 2013
KEYIDGROUP
1 1 a
2 1 b
3 2 a
4 2 b
5 3 a
6 3 b
7 4 a
8 5 a
This is my simple table I need a query that will identity the ID's that are missing the group "b" but I don't want ID 1,2,3 to come up because they are part of a and b. I just need to see anything missing only "b" but not if it's part of a and b.
query should reveal answer should be missing the group b
KEYID
7 4
8 5
I tried the NULL search but since the records don't exist it cant find a null. I am writing a query to identify the missing ID without B but exclude ID that are part of A and B
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Dec 13, 2007
I can't figure out how to get my line chart to break when there isn't a value. For example, I have a trend line over 4 time periods. The 3rd time period is missing a value. Instead of the line ending at the 2nd period and picking up again at the 4th time period, it's connecting the line 2nd to the 4th period. I'd like it to break and for there to be no line appearing in the 3rd period. I bet that's as clear as mud, but let me know if you have any questions.
Thanks!
sash
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Apr 27, 2015
Write the query that produces the below results. I'm not ale to join the two sets in a way so that it displays NULLs if no purchase was made on a given day for a particular product. I need NULLs or s so that it shows up correctly on my SSRS report.
-- declare @from DATE='2015-1-5',@to DATE='2015-1-10'
-- test data
;with testdata as(
SELECT 1 AS Id,'1/6/2014' AS Date, 21 As Amount UNION ALL
SELECT 1 ,'1/8/2014', 25 UNION ALL
SELECT 1 ,'1/9/2014', 30 UNION ALL
SELECT 1 ,'1/10/2014', 60 UNION ALL
SELECT 1 ,'1/5/2015', 3800 UNION ALL
SELECT 1 ,'1/6/2015', 7120 UNION ALL
[code]....
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Feb 8, 2007
Ok, so I must have screwed something up.
I have several databases set up for transactional replication to another instance of SQL Server 2005 for fail over purposes. Today, I restored one of those replicated databases to my development machine and discovered two surprising problems:
1) The Default Values settings in the replicated tables are missing. They are there in the publishing tables, just as they were before I set up replication. However, they are not in the subscribing tables. Now, this is not such a big issue, since I tend to send all default values in insert queries as necessary.
2) The second problem is a more of an issue, since I use auto-numbered Identity columns in my tables (yes, I know that's just plain lazy...). Anyway, in the replicated tables, €śIs Identity€? is indeed set to yes, but despite that fact that there are thousands of records with incrementally unique IDs, SQL server is trying to insert a record starting with 1. This, of course, throws a PK constraint error.
Obviously, if I am use them for failover purposes, these replicated databases need to be identical in every way.
So, what did I do to cause this situation, and how to I fix it?
Thanks a bunch!
md
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Jan 7, 2008
Hello,
I have the following query which grabs monthly usage data which is logged to a database table from a web page:
SELECT Button = CASE ButtonClicked
WHEN 1 THEN '1st Button'
WHEN 2 THEN '2nd Button'
WHEN 3 THEN '3rd Button'
WHEN 4 THEN '4th Button'
WHEN 5 THEN '5th Button'
WHEN 6 THEN '6th Button'
WHEN 7 THEN '7th Button'
WHEN 8 THEN '8th Button'
WHEN 9 THEN '9th Button'
ELSE 'TOTAL'
END,
COUNT(*) AS [Times Clicked]
FROM WebPageUsageLog (NOLOCK)
WHERE DateClicked BETWEEN @firstOfMonth AND @lastOfMonth
GROUP BY ButtonClicked WITH ROLLUP
ORDER BY ButtonClicked
The results look like this:
TOTAL 303
1st Button 53
2nd Button 177
3rd Button 10
4th Button 4
6th Button 18
7th Button 19
8th Button 21
9th Button 1
If a button is never clicked in a given month, it never gets logged to the table. In this example, the 5th button was not clicked during the month of December, so it does not appear in the results. I want to modify my query so it displays the name of the button and a zero (in this case "5th Button 0") in the results for any buttons that were not clicked. For some reason I am drawing a blank on how to do this. Thanks in advance.
-Dave
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Jun 2, 2015
I'm trying to swap out old partitions and getting "An error occurred while processing 'AltFile' metadata for database id 12 file id 605" 605 is missing from sys.sysfiles. I've tried adding new file groups since it seemed to be assigning them in that range to allow the command to find a match. Once created and I issue the alter command the file id of the target file changes to something else in the missing range.
The file id values seem to be managed solely by sqlserver so I'm not sure what to try. There are hundreds of files with millions of rows and the method has been used problem free for years. I do occasionally get "unable to remove file because it's not empty" once in a while which may be related. I wind up having to shrink those and leave them in existence.
The target file group has an existing file id value when you join sys.sysfiles using the filegroup name.
I partition data in 2 tables on one filegroup per day. I swap out parition 1 each day which makes the new earliest day's partition the new partition 1. Different databases have different day ranges depending on requirements.
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Jul 9, 2007
Hi,
I'm inserting a datetime values into sql server 2000 from c#
SQL server table details
Table nameate_test
columnname datatype
No int
date_t DateTime
C# coding
SqlConnection connectionToDatabase = new SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=testdb;Integrated Security=SSPI");
connectionToDatabase.Open();
DataTable dt1 = new DataTable();
dt1.Columns.Add("no",typeof(System.Int16));
dt1.Columns.Add("date_t", typeof(System.DateTime));
DataRow dr = dt1.NewRow();
dr["no"] = 1;
dr["date_t"] = DateTime.Now;
dt1.Rows.Add(dr);
for(int i=0;i<dt1.Rows.Count;i++)
{
string str=dt1.Rows["no"].ToString();
DateTime dt=(DateTime)dt1.Rows["date_t"];
string insertQuery = "insert into date_test values(" + str + ",'" + dt + "')";
SqlCommand cmd = new SqlCommand(insertQuery, connectionToDatabase);
cmd.ExecuteNonQuery();
MessageBox.Show("saved");
}
When I run the above code, data is inserted into the table
The value in the date_t column is 2007-07-09 22:10:11 000.The milliseconds value is always 000 only.I need the millisecond values also in date_t column.
Is there any conversion needed for millisecond values?
thanks,
Mani
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Jan 10, 2008
Hello!
Is there an easy way to deal with this situation below when reading in data from a SQL Database:
int? myNullableColumn;myNullableColumn = Convert.ToInt32(datarow["datacolumn"]);
Where, ideally, 'myNullableColumn' would be 'null' if the value was 'DBNull.Value'. This does not work because Convert.ToInt32 will not convert 'DBNull.Value to null', but instead throws an error.
Is there a built in funtion that does do this?
Thanks!
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Mar 14, 2008
Ok, I have a table with about 47000 records in it. I have the following query for that table:Select ReportType =
Case
When ReportType = 1 Then 'Uniquery Report'
When ReportType = 2 Then 'SABRE Report'
When ReportType = 3 Then 'Menu Report'
Else Null
End,
ReportNameTo_,
Frequency.Frequency as Frequency,
ReportDate,
ReportDescription
From Report
Inner Join Frequency on ( Report.ReportFrequency = Frequency.FID )
Where ( Active = 1 )
And ReportDate = ( Select Max ( ReportDate ) From Report Where ( Active = 1 ) )
And ReportID = ( Select Max ( ReportID ) From Report Where ( Active = 1 ) )
The idea is that i need to get only the last report based off of unique reportname. I added a computer column to the table to give me the ReportNameTo_, since my deliminator is the _. Now my issue is that I have 1 records showing (the last record added to the table), which is right for the query that is written, but wrong for what I want. I need to only return the last record for each unique ReportNameTo_. So as an example, my table has the following ID, ReportNameTo_, Date fields the data looks something like this:
1, 123_, 1/1/20082, 123_, 1/1/20083, 124_, 1/1/20084, 124_, 1/1/20085, 125_, 1/1/20086, 125_, 1/1/20087, 126_, 1/1/20088, 126_, 1/1/2008
I only want to return the following:
2, 123_, 1/1/20084, 124_, 1/1/20086, 125_, 1/1/20088, 126_, 1/1/2008
Hope someone out there can let me know how to do this... I am almost there, just not all the way.
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Feb 15, 2002
Hello!
Just looking for advise on dealing with duplicates in database.
I have a contact table that have a bunch of duplicated customer records.
My goal is to combine all duplicated records into one record.
This involves couple tables:contact,contact history ,calendar.
All tables related by common column "accountno".
What would be the best approach for this?
Thank you,
Lena
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Mar 15, 2002
I have the following query in a stored procedure. If there are no rows in the history file, it returns a null. If there some setting or function that would have it return a zero if no rows are found? I use the variable to do arithmetic later on and a null messes everything up.
select@MarketTotal = sum(isnull(MarketValue,0))
fromhistory
whereEmpUID = @EmpUID and
Shares > 0
Thanks,
Ken Nicholson
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Jun 9, 2006
Hi i have the following :
select agent, name, surname, address, cust1_text01, cust1_text02, phone1,
case call_type_id
*when NULL then ''
else call_type_id
end as 'call_type_id'
from Record_T
* I have also tried when NULL then space(1)
yet the query still returns NULL when this field is empty ?
the idea is to always return data, even if the field is NULL to
replace it with an empty space or spaces.
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Sep 28, 2007
Hello,
Question 1:
In my senario i've developed a system which utilizes 2 database, i've writen queries like db1.dbo.table1 join db2.dbo.table2 etc... Now that db2 is getting huge, client wants to shift it to another server.
I don't know how to modifiy my queries to cope with such situation. Could somebody plz tell me on how to you write queries involving two databases from different servers.
Question 2:
I'm maintaining second database (db2) to keep track of records of db1 which have been processed by my software, so that when db1 gets added with more records i can compare db2 table with db1 table to identify which records are new.
db1 is not my database and i don't have any control over that, (it's some erp db), is there any way of identifying which rows have been processed. Can the need for db2 be eliminated?
I'm using SQL Server 2005
Thank You,
Sandeep.
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Apr 4, 2007
I am trying to make a stored procedure in SQLServer Express.The question is related to this stored procedure / transact - sql. I think i am doing something wrong with datetime.Here is the stored procedure.The error i am getting is that:Msg 241, Level 16, State 1, Line 20Syntax error converting datetime from character string. ===================================== DECLARE @websiteID intDECLARE @dateFrom datetimeDECLARE @dateTo datetimeDECLARE @sortbystring varchar (20)set @websiteID = 1set @dateFrom = Convert(datetime, '2007-02-07 12:01:00')set @dateTo = Convert(datetime, '2007-03-07 11:59:00')set @sortbystring = 'Campaign'IF ISNULL(@dateTo, '') = ''begin SET @dateTo = @dateFromendSET @dateTo = DATEADD(d, 1, @dateTo)DECLARE @str CHAR(400)LINE 20: SET @str = 'SELECT dateEntry, c.name as Campaign, e.firstname as FirstName FROM entry e, campaign c WHERE e.campaignID = c.id ' + 'AND c.websiteID = @websiteID' + 'AND (ISNULL(' + @dateFrom + ', '''') = '''' OR e.dateEntry BETWEEN '' + @dateFrom + '' AND '' + @dateTo + '') ' + 'AND e.IP NOT IN (SELECT IP FROM IP) ' + ' ORDER BY dateEntry DESC'print (@str)===============================================
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Dec 16, 2004
I have a stored procedure that takes less than 1 second in sql query analyzer to return my results.
I run this same SP in ASP.NET using a calendar control and using perf monitor I notice that for me from my dev machine my cpu utilization is sometimes over 40%.Is there any tweaks I can do to help decrease CPU utilization.
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Jan 23, 2004
I'm looking for opinions here:
I have a stored procedure that has one required variable, and two optional variables, like this:
CREATE PROCEDURE sp_tariff_rule
@tariff_id INT,
@start_date DATETIME = NULL,
@end_date DATETIME = NULL
...etc...
I want the procedure to process
1) all data is no dates are presented
2) all data after the start date, if no end date is supplied
3) all data before the end date if no start date is supplied
4) all data between the start and end dates if both are supplied
Now, instead of an elaborate conditional, I added this to the WHERE clause of my SQL statement:
AND ((@start_date IS NULL OR service_date >= @start_date) AND (@end_date IS NULL OR service_date <= @end_date))
It works fine, but I want to know if anyone has a different/better way of doing it, or if there is a big bug waiting to happen here.
I typically don't like to create multipurpose routines in my code, but this is a better approach for my in a non-object-oriented world of SQL.
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Nov 14, 2005
In SS 2000 it seems that there is no variable data type that can hold more than 8000 characters (varchar) or 4000 unicode characters (nvarchar). I've seen posts where multiple variables are spliced together to extend this limit. I am looking at performing string manipulations in an sproc and I need to be able to deal with the full 2GB/1GB limit of text and ntext field types. Is this possible? How do you deal with that?
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May 31, 2007
Hello all. Got bit of a long winded question here...........so here we go lol.
OK.......ive got data on an Excel spreadsheet. Ive set the spreadsheet up as a linked server and i'm creating a set of insert statements from it by using the following code:
SELECT 'INSERT INTO TRAINREC (COURSE_NAME) VALUES ('''+
EMPLOY_REF + ''', '''+
FROM AtriumDD...['Employee Training Records$']
For most records this generates a correct insert statement.........for example:
INSERT INTO TRAINREC (EMPLOY_REF, COURSE_NAME) VALUES ('153', 'NMA Panel');
However.........my problems start when the value for course name is containes an ' character. If it does the insert statement generated is incorrect. For example:
INSERT INTO TRAINREC (EMPLOY_REF, COURSE_NAME) VALUES ('139', 'Annual Accounting in Lloyd's Market');
can anyone suggest any ideas on how to get round this? Also if i havent explained it clearly enough just let me know and i can try and expand on it.
Thanks for reading.
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Jul 20, 2005
I have a stored procedure as a recordsource from a contacts table. Inthis example, users can enter parameters to limit contacts by firstletter of last name or company name or keywords:Example:@myName nvarchar(30) = null,@Alpha char(1) = nullSELECTContacts.ContactID, ContactType,CASE WHEN Contacts.ContactType = 0THEN Contacts.CompanyNameELSEisNull(Contacts.LastName,'?') + ', ' +isNull(Contacts.FirstName,'?')ENDAS CNAMEFROMContactsWHERE(Keywords Like '%' + @myKeyword + '%' OR @myKeyword is Null)So far, so good, but...The problem is I want to also give the user the option of filteringalphabetically by first letter. I can't figure out how to deal withnulls in this example (user doesn't enter anything as parameter@Alpha):AND(@Alpha = CASE ContactType WHEN 0 THEN Left(LastName,1) ENDOR@Alpha = CASE ContactType WHEN 1 THEN Left(CompanyName,1) END)Any help is appreciated,LQ
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