Lookup Transform With Multiple Matches
Aug 3, 2007
Please indulge my ignorance, as I have only been using SSIS for a couple of weeks.
I'm trying to create a data warehouse using two input tables.
A column needs to be added to one table by using a lookup into the second table.
SSIS seems to handle the "no matches" and "single match" cases perfectly.
I can't for the life of me figure out how to properly handle multiple matches.
SSIS defaults to the first match, but I need to compute the "best" match.
Many thanks in advance
Scott!
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Nov 24, 2007
Has anyone find solution for this problem.
i also checked
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=298056&SiteID=1 and
http://blogs.conchango.com/kristianwedberg/archive/2006/02/22/2955.aspx
Suppose have a Dimension table
DimColor
----------------------------
ColorKeyPK(smallint) ColorAlternateKey(nvarchar(30))
-1 UnknownMember
1
2 Blue
3 Red
4 Black
Color with the ID 1 is empty string
FactOrders
---------------------------
OrderID Date Color Quantity
OrderID = 1 Color = 'Black' Quantity = 10
OrderID = 2 Color = 'Red' Quantity = 20
OrderID = 3 Color = '' Quantity = 10
OrderID = 4 Color = 'Blue' Quantity = 5
OrderID = 5 Color = Black Quantity = 10
When i use the Lookup transform it cannot find the ColorKeyPK
The result of the Lookup transform is.
------------------------------
OrderID = 1 Color='Black' ColorKey=4
OrderID = 2 Color='Black' ColorKey=3
OrderID = 3 Color='Black' ColorKey=NULL ----> This is the problem Lookup cannot find empty string. It should be 1.
OrderID = 4 Color='Black' ColorKey=2
OrderID = 5 Color='Black' ColorKey=4
Thanks from now.
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Jan 16, 2013
I work in the healthcare area, and am handling the survey data ETL's. There are around 8 different survey areas and based on information received from them for the visit they reference, I want to pull in more info from our invoicing database. My idea is this:
1.) Pull in the flat file to an ODBC staging table
2.) Cache all invoice records that fall between the MIN(Date of Service) and MAX(Date of Service) from the staging table.
3.) First lookup the information needed on patientID, providerID, date of service, and billing location.
4.) For the surveys that didn't match on those 4 columns, try looking up based on patientID, date of service, and billing location (since I could be 99% sure this would still return the record I need).
5.) For the remaining surveys, lookup based just on patientID and date of service. These records will be flagged for manual review because clearly, if a patient has multiple appointments in the same day, this will be prone to error.
However, in trying to use only 3 of the columns in the lookup, I get the error saying basically that I need to utilize all 4. Is there a way around this, or is there an entirely different way I should be approaching this? The reason I thought cache transform was the answer is because I will need to run a different package for each lookup, as the data and logic between each survey will vary, but the invoice data "pool" will stay the same regardless.
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Mar 11, 2013
Basically I have a table of users (id, name), a lookup table preferences (id, title) and the table of user-pref (idUser, idPref).Given a user id X I wanted to select a list of users, ordered by the highest amount of coincidence in the preference table...
something like
SELECT * FROM users WHERE id <> X ORDER BY -number of common preferences-
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Aug 22, 2007
I have a very simple problem I am trying to solve.
I have a table with a "DateEntered" field, and I have an ssis pkg set up to load data from a file into the database table. I just want to make sure that no one loads the same file twice in one day.
For example, if today is 8/22/07, and "DateEntered" is "2007-08-22", then I want to add a Lookup transform to run a query that will check and see if there's any rows in the table with a "DateEntered" is "2007-08-22". If so, don't load the file again!
Here's my query:
SELECT Code
FROM myTable
WHERE DATEADD(dd, DATEDIFF(dd, 0, DateEntered), 0) = DATEADD(dd, DATEDIFF(dd, 0, GETDATE()), 0)
(all the dateadd stuff is doing is removing the time portion from the DateEntered field, so we are comparing apples to apples).
Now, if the query returns a bunch of "Codes" then we know that the data has already been entered for the day! So far, so good.
Now, how do I set up the Lookup to get it to work? I'm getting this error message:
Error 1 Validation error. Data Flow Task: Lookup [1299]: The lookup transform must contain at least one input column joined to a reference column, and none were specified. You must specify at least one join column. FXRateLoader.dtsx 0 0
But I thought I did this! On the columns tab, I have:
Lookup column: code
Lookup operation: Replace 'code'
Output alias: code
I have my error output set to:
Lookup output - redirect row
I don't know what I'm doing, obviously..........!
Need assistance :-)
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Jan 24, 2007
Hi!
I am a newbie, grateful for some help. I have a Source Ole DB w sql-command selecting the customer.salary and customer.occupation, which I want to match with demo_id in Ole DB destination.
salary, occupation also in dim_demographic.
But in Lookup editor I find no column demo_id... how do I do this?
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Jun 25, 2007
Please suggest me an article that describes 'Lookup Transform' (Specifically passing parameters) in detail.
Note: Is it possible to pass "variable" as parameters in Lookup transform?
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Apr 16, 2007
Dear friends,
I have a ETL that have a Lookup transform to get a rate from a table SpotRates.
The problem is when the match od some date in SpotRates Table doens't exist...
And for that records I need to lookup for next date...
For example...
SpotRate Table
Date
Currency
Rate
05-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2262
06-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2312
07-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2179
10-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2099
11-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2105
12-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2125
13-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2094
18-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2252
19-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2346
20-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2346
21-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2315
24-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2365
25-04-2006 0:00
DOLAR ESTADOS UNIDOS
1,2425
When I first try to lookup the date 17-04-2006, doesnt give me any records... and I need to create a new lookup for the next date from 17-04-2006. And in this example the next date is 18-04-2006.. How can I do it??
I made a sql query date gives me the next date with 2 parameters ... but I'm having some errors...
SELECT TOP 1 Data
FROM Spot_Rates
WHERE (Currencies_Name = ?) AND (Data > CONVERT(DATETIME, ?, 102))
ORDER BY Data DESC
In this exampple, the parameters returned from lookup1 is:
Currencies_name= 'DOLAR ESTADOS UNIDOS'
DATE='17-04-2006'
I need to create a second lookup transform to return the next date/currency for each row that didnt match in the first lookup...
Regards,
Pedro
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Aug 10, 2007
I want to do something relatively simple with SSIS but can't find an easy way to do this (isint it always the case with SSIS )
I have a column lets say called iorg_id, and I want to lookup the matching rows for this col in a table.
In this table iorg_id may have several potential matching rows. In this table there is another col called 'Amount'.
I want to retrieve for each iorg_id the matching iorg_id in the other table but only the row with the largest value in the 'Amount' col.
I couldn't find a way to do this all in the Lookup Transform.
I can match the iorg_ids and retrieve the Amount column, but can't find a way just to retrieve the matching row with the largest value in the Amount col. The only way I can think to do this is then run the output from the Transform through an Aggregate function and determine the Max (although haven't tested this yet).
Seems strange to me in that the SQL in the Advanced tab gives me something like:
select * from
(select * from [dbo].[Table1]) as refTable
where [refTable].[iorg_id] = ?
where I believe the first 'select *' is retrieving all the cols that are listed in the LookupColumns list in the Columns tab.
I thought I would be able to amend this to something like:
select max(amount) from
(select * from [dbo].[Table1]) as refTable
where [refTable].[iorg_id] = ?
but I get a metadata type error.
So, questions are:
Is it possible to do this all in the Lookup Transform are do I have to use the Aggregate function as I think ?
Why is it not possible to amend the sql in the Advanced tab to manipulate the returned data ?
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Oct 27, 2007
I am trying to digest this logic, and have been unsuccessful so far. I am designing a package for incremental loads, but the destination table has a composite primary key on 2 columns, one of which is nullable. The source data comes from a SPROC. Uptill now, I have been banging my head trying to get this logic to work via the Lookup transform with a conditional split, but it doesn't work. Am I on the right track, or should I be using the SCD Wizard?
As a side note, I have been trying to work a solution using Andrew's blogpost on doing incremental loads: http://sqlblog.com/blogs/andy_leonard/archive/2007/07/09/ssis-design-pattern-incremental-loads.aspx
Thanks.
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Jun 8, 2006
Is it possible to use a VARIABLE in the Lookup Transform? I am setting the cache mode to partial and have modified the caching SQL statement on the advanced tab to include the parameterized query, but the parameter button only allows me to select columns to map to the parameter. I need to use a variable instead. I see the ParameterMap property of the transform in the advanced editor, but don't see how I can use this to map to a variable.
Can this be done, or do I need to use a new source, sort and left join component to accomplish the same thing?
Thanks!
Brandon
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Oct 31, 2006
Hi,
i'm creating a Lookup programmatically. But i can't find out how to assign the ConnectionManager that references the lookup data.
Do you have an example for me?
Many thanks in advance.
Stefan L.
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May 14, 2008
Hi,
I get the following error when
i configure the lookup transform in the data flow task "Input column has a data type that cannot be matched".
This is the query that i use to set the reference table dataset
select firstname, lastname, address, email from customers_dimension cd , cust_test ct where cd.address<>ct.address.
I basically want to try and find all those records that have the same firstname, lastname, email in the customer dimension table where the records do not match. Both the input fields and the lookup fields have the same data type [varchar(max)].
It is pretty confusing, so much so that i did the lookup against the exact same table and got the same error.
Does anyone have a better idea as to what the problem is?
Thankyou
P.S.-This is the caching statement in the advanced tab
select * from
(SELECT firstName
FROM Customers_Dimension) as refTable
where [refTable].[firstName] = ?
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Oct 25, 2005
I'm trying to lookup a value in another table linking on a column of datatype DT_R8. The lookup transform is complaining that I can't link on that datatype. However, the documentation says that it should work. I'm using the April CTP. Is this fixed in a later version? Any suggestions?
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Mar 14, 2006
I am having problems with a lookup transformation. I have a row in my lookup table for blank ('') source data. If I test the join using SQL the match is made, but the Lookup transform doesn't consider it a match and sends it to error output. Is there a property that I don't have set correctly or something else I am forgetting?
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Sep 6, 2010
I've a simple lookup transform in SSIS 2008 (R2). I've created it with a full cache and it worked fine. When i switch to partial cache, it will give me this error:
--------------------------------------------------------------------------------------------------
TITLE: Package Validation Error
------------------------------
Package Validation Error
------------------------------
ADDITIONAL INFORMATION:
Error at DFT_AdventureWorks [Lookup [411]]: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80004005.
[Code] ....
I've created a OLE source with the following query :
SELECT
SalesOrderID,
OrderDate,
CustomerID
FROM Sales.SalesOrderHeader
And this will flow into the lookup transform and this has the following lookup reference query:
SELECT CustomerID,
AccountNumber
FROM Sales.Customer
WHERE CustomerID % 7 <>0
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Jul 10, 2007
I have a package that works fine in development. I move the package over to test and it fails validation in the lookup transform.
Error 46 Validation error. Data Flow Task - PO Lines Interface: Lookup - LIST PRICE [29621]: output column "LIST_PRICE_PER_UNIT" (29667) and reference column named "LIST_PRICE_PER_UNIT" have incompatible data types. SPO_TO_ORACLE_PO.dtsx 0 0
What strikes me as odd is the fact that I don't have a way of specifying the data types. I just specify the column I wish to return as a new column with the same name. Anyway, why would this work in one instance but not another?
thanks
John
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Oct 20, 2007
I am using the lookup transform with the following settings:
Reference table: Use results of an SQL query. The query retrieves the surrogate key and four business key columns from a dimension table which contains a few thousand rows.
Columns: business keys in the incoming data are mapped to the business keys in the reference table, and the surrogate key is looked up from the reference table.
Advanced: Enable memory restriction is OFF (and the other items on the Advanced tab are greyed out).
I assumed that this means that the lookup transform would cache all of the rows in the SQL query, and then perform the lookups against this cache. This is the behaviour that I saw when I was running the package in my local environment in the BIDS debugger.
However, a colleague was doing some profiling on our production database server, and noticed that the lookup transform is instead issuing a single SQL query for each row of input. Our production ETL server has many GBs of free RAM available (way more than enough to cache the contents of the lookup table in memory), and given that memory restriction is disabled, I don't understand why the lookup transform is behaving in this fashion. Does anyone have an explanation for this? I'm probably misunderstanding a key concept here.
Thanks,
Greg
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Feb 6, 2007
I have a requirement to access a lookup table from within an SSIS Transform Script Component
The aim is to eliminate error characters from within the firstname, lastname, address etc. fields by doing a lookup of an ASCII code reference table and making an InStr() type comparison.
I cannot find a way of opening the reference data set from withing the transform.
Regards
Tim
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Jun 2, 2015
If it possible to have an if statement match multiple results, as to not have to use the OR multiple times.
Example: I want to say, if Description equals red or blue or green or yellow or orange or black or white or pink, without having to use OR and OR and OR. Description can match 10 different values.
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Aug 9, 2007
I would like to know what happens when a very large reference data set for a lookup transform with full caching enabled is getting loaded during package execution and the computer memory runs out or is very low.
Does SSIS
a) give an out of memory error of some sort
b) resort to a no caching or partial caching mode
c) maintain the full caching mode but will switch to using the paging file(virtual memory).
I think it will resort to using the page file in which case the benefits of in memory lookups are lost and performance would suffer. If I cannot upgrade the memory or shrink the reference set somehow, i should switch that lookup task to use partial caching or no caching with an indexed lookup table. Would this make sense?
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Jul 30, 2015
We are using lookup transformation in SSIS 2012. The lookup transformation queries a table with two date columns. When we hover the mouse over the two columns in the 'columns' tab of the lookup transformation editor, the two columns show as DT_WSTR instead of DT_DBDATE. This causes the SSIS package to fail due to data type mismatch.A similar abandoned thread is available at: URL....
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Sep 1, 2006
I am trying to interpret some of the results I observe when trying to match similar records using a fuzzy lookup transform, but it's not entirely clear how the overall row similarity score is calculated. In particular, sometimes rows with lower individual column similarity scores will achieve a higher similarity and confidence score than a matching row with higher individual column scores.
The transform is configured with 6 text fields set to fuzzy mapping and a minimum similarity of 0, and 3 additional numeric fields with an exact mapping. It is set to return a maximum of 2 matches per lookup and to do an exhaustive search of the reference table.
For example, from the following matching pair of records Match 1 is picked over Match 2 even though it's individual scores are lower.
Match 1 Match 2
----------------- -----------------
_similarity_author 1.0 1.0
_similarity_title 0.85344648 1.0
_similarity_headline 0.0125 0.0125
_similarity_summary 0.0125 0.0125
_similarity_picture 1.0 1.0
_similarity_caption 1.0 1.0
_similarity 7.8429267E-2 7.3196657E-2
_confidence 0.55728668 0.44271332
In another case both matching records have *identical* scores for every mapped column and yet their similarity and confidence scores are different.
Clearly there are other factors involved in calculating the overall row score. Anybody know what these are?
Fernando Tubio
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Feb 1, 2008
I have a TechFactTable containing the following information --- TechName1, TechName1 ... etc. There are 5 techs assigned to one record for round the clock service. For this fact table that I'm creating, I need to use a TechDimension (TechIDs, TechNames) to create a ID mapping that can be used in the fact table. The fact table needs to use the TechIDs not names.
I'm trying to create, can I set my lookup (ref table = TechDimension) to look up all 5 of these IDs at the same time?
For example,
Code Snippet
[TechFactTable]
TechName1 TechName2 ...
--------- ---------
Obama Clinton
[TechDim]
TechIDs TechNames
---------- -----------------
1 Obama
2 Clinton... ...
So i've set up my lookup query to return the TechDim info using something like
Code Snippet
SELECT T1.TechID AS TechID1,
T1.TechName AS TechName1,
T2.TechID AS TechID2,
T2.TechName AS TechName2
... (etc)
FROM TechDim T1 LEFT JOIN ON TechDim T2 ON T1.TechID = T2.TechID
After this I mapped my columns in the lookup so that I had
TechFactTable TechDim
TechName1 ------> TechName1
TechName2 ------> TechName2
and then return the newly added columns TechID1 and TechID2 but all in the SAME LOOKUP?
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Aug 31, 2006
Is it possbile to have multiple fuzzy lookup within a data flow?
I need to have at least 3 fuzzy lookup in a data flow. Here're the conditions that I try to find match: 1=Zip&City, 2=Zip&State, 3=City&State. I've the first fuzzy lookup working fine. After that, I've a conditional split to get any unmatch, then use another fuzzy lookup for a second condition...at this point, I get the error saying "The package contains two objects with duplicate name of output column _Similarity..." I do not need to get the _Similarity and _Confidence, so is there a way to exclude them from returning in the output?
Any comments?
Thanks in advance.
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Sep 27, 2007
In a Lookup component I've defined a SQL query which returns a sorted resultset. For each Lookup component input row I want to have a single output row. Problem is that for each input row there is possibility of multiple matches in SQL query resultset. From all of the possible multiple hits I want only the first one to be returned, and if no match is found then no output row. How to implement this?
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Apr 3, 2007
I'm developing an ETL solution that needs to look for duplicate records using a fuzzy lookup. If the lookup table has an identity column, I get the following error. I can get this to work on a local desktop instance of SQL server, but not on my development server or production box. Any help is greatly appreciated.
Also I've stripped down the incoming data for the lookup to a very simplified version of what I'd like to use, but if I can't get it to work then I can't add addtional columns to match with.
It's like it's trying to add it's own Id to the temp table created for the tokens
An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80040E14 Description: "Multiple identity columns specified for table '##FLRef_070403_10:09:36_3532_aeac56a4-8bc0-4ff4-ac41-0984e293261a'. Only one identity column per table is allowed.".
An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80040E14 Description: "Database name 'tempdb' ignored, referencing object in tempdb.".
Error: 0xC004701A at Move Clean Records into Clean Enrollment, DTS.Pipeline: component "Fuzzy Lookup" (300) failed the pre-execute phase and returned error code 0xC0202009.
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Aug 31, 2015
I have two records in the source with information ID, RevisionID, Description, Region
There are two lookup files one with ID,Description amd other with ID, Region
I wish to update my two source records with performing lookup with these two files.To get the correct description and region data. How to do this in ssis DFT.
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Sep 27, 2015
My report has two data sets that hold inventory from two different departments.
ds_DeptA and ds_DeptB
I have a table, that pulls the DeptB status of DeptA record and displays it. This returns empty when the lookup fails to make a match, which is fine. Typically means DeptB does not have the record yet. I need to count these empty (null) feilds and populate it in a Text box outside of the table.
I just can't figure out the syntax with multiple datasets. I can't use the lookup expression as part of the count expression since the count expression is not contained in a table that has a dataset.
table: ds_DeptA
fields:
ID
Name
date_set_to_DeptB
<<Expr>> =Lookup(Fields!ID.Value,Fields!DeptA_ID.Value,Fields!DeptB_Status.Value, "ds_DeptB")
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Oct 17, 2006
Hi all,
I have more than 1 set of columns I'm trying to normalize, can an unpivot transform handle 2 unpivots around DIFFERENT keys in the same transform?
If not, would the suggestion be unpivot into temp tables for whatever needs normalizing, than run an update query to generate the row that is desired?
Thanks in advance.
Mark
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Jan 31, 2007
Hi,
I am using ATL COM library application. It is using sql data base for fetching the records. Some times, i get the following error. could you please let me know, why this happens? This is not reproduceble every time.
(Error! hr=80040e21, hrDesc=Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work
Here is the code to connect to database which i am using.
CDataSource db;
CDBPropSet dbinit(DBPROPSET_DBINIT);
dbinit.AddProperty(DBPROP_AUTH_INTEGRATED, OLESTR("SSPI"));
dbinit.AddProperty(DBPROP_INIT_CATALOG, (const char *)bDatabase);
dbinit.AddProperty(DBPROP_INIT_DATASOURCE, (const char *)bServer);
dbinit.AddProperty(DBPROP_INIT_LCID, (long)1033);
dbinit.AddProperty(DBPROP_INIT_PROMPT, (short)4);
dbinit.AddProperty(DBPROP_INIT_TIMEOUT, (short)150);
hr = db.Open(_T("SQLOLEDB.1"), &dbinit);
if (FatalError(hr, "db.Open", buf))
{
*iErrorCode = hr;
return S_OK;
}
Any help, appreciated.
Thanks,
Satish
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Jan 25, 2008
I have a pivot transform that pivots a batch type. After the pivot, each batch type has its own row with null values for the other batch types that were pivoted. I want to group two fields and max() the remaining batch types so that the multiple rows are displayed on one row. I tried using the aggregate transform, but since the batch type field is a string, the max() function fails in the package. Is there another transform or can I use the aggragate transform another way so that the max() will work on a string?
-- Ryan
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Apr 17, 2007
i dont know why this has slipped my mind but how would i say,
if @test = 'a' or @test = 'b' or @test = 'c'
in a shortted way?
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