Fuzzy Table Joins
Apr 14, 2005
I need to link two tables on the Name Field. The trouble is that the names are not enterred the same in each table, so I can't do a direct = comparison.
For instance, one table might have "The Heart Center of Indiana", while the other has "Heart Center of Indiana" Or one might have "St. John's Medical Center" and the other has "St Johns Medical Center" (or, god help me, "St John's Hospital")
My only thoughts are somehow building a matching rank by saying that 85% of the characters in "The Heart Center of Indiana" match "Heart Center of Indiana". There are thousands of names in each list, and I would very much not like to have to manually try to spot them.
I doubt there is a direct solution to my problem, so any tips on how I can make a translation table is aoppreciated.
Thanks,
David
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Nov 1, 2006
Hi there,
if i have a table with columns:
Teacher ID1 | Teacher Comment1 | Teacher ID2 | Teacher Comment 2 |
i also have another table that links the teacher ID with their names called [Staff Profiles]
how do i create a query that returns the names of both teacher 1 & 2. i have tried:
SELECT *
FROM [Subject Assessment] INNER JOIN [Staff Profiles] ON [Subject Assessment].[Teacher ID1]=[Staff Profiles].[Teacher ID]) INNER JOIN [Staff Profiles] ON [Subject Assessment].[Teacher ID2]=[Staff Profiles].[Teacher ID];
This throws an error. I have tried Aliasing but this also throws an error.
don't know whether this makes a difference, but the table which i gave was a join in the first place.....
i.e. teacherID1 | Teacher Comment1 is the tutor report of which there is one per student
teacher ID2 | teacher Comment2 is the subject report of which there are many per student
thanks in advance
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Mar 4, 2006
Hello All,
For those who are interested in Approximate String Matching or those who could use these algorithms; I have a complete suite of Approximate String Matching algorithms written in Visual Basic in an Access database.
In 2004 I decided to jump into the world of Fuzzy Matching with both feet.
As it is, I am working for a company that deals with names, addresses, etc. very intensely. It is a fair sized company that
uses Access on a grand scale. Since I am an Access programmer, I work in an Access gold mine!
I knew that if I could get a good handle on Fuzzy Matching, that when I hit the right person at the right time, the company could greatly benefit from my research on Fuzzy Matching. The right time and the right person are not here yet.
Nevertheless, since I have reaped much free source code and information from the Web, it is now time to return the favor.
I developed a package that is sort of a demo/tutorial on Approximate String Matching algorithms in Access that is very
robust in Fuzzy Matching. It would overtax the post in this forum for me to include it in a post.
To summarize, it works with the basic name - Last, First, and Middle. It has a user interface that allows a user to type in
what would be a good name and what would be a questionable name to resemble the good name. The weighted results of all the various algorithms can be chosen, or an individual algorithm can be chosen to display how closely the names match.
In addition, it has a table of 17,295 known good names with unique ID numbers as a reference table, and table of 1200
morphed names that are typical of names entered in a database with no input conventions. These morphed names have typos, transpositions, variations on maiden names, etc. 1200 good names were selected for alteration and the unique ID of each original good name was stored in the table with the altered names to determine the accuracy of the matching process.
The morphed names were compared to the known good names in a query with an approximate join using the suite of algorithms to determine match percentage. The altered names, the ID number of the original good name, the ID number of the name it matched to, and the match percentage were stored in a results table to determine the results of the matching run.
These tables were used to test and tweak the algorithms by comparing the morphed names with the known good names. The results of 1322 names were saved to a results table with match scores.
The matching process was executed in a query with an approximate join using the suite of algorithms.
The match results:
Total Approximate Matches: 1188
(Recall) Precision Pct: 99.00%
Total Unmatched Names: 12
Unmatched Pct: 1.00%
Total Other Matches: 134
Other Matches Pct: .77%
The tables are accessible in the database, so anyone can run their own tests. The interface is set up to accommodate this
as well.
The algorithms used: Dice coefficient as a threshold algorithm, Levenshtein Distance algorithm, Longest Common Subsequence, and the DoubleMetaphone. The names were passed to the algorithms by way of the bigram model.
I will email it to anyone who requests it.
It is in two platforms, Office 97 and Office 2000 as FuzzyMatching97.zip (692 KB) and FuzzyMatching2k.zip (721 KB).
The zip files include ApprxStrMatchingEngine97.pps or ApprxStrMatchingEngine2k.pps respectively, StrMatching97.mde or StrMatching2k.mde respectively, IEEESoundexV5.pdf, and VBAlgorithms.txt.
IEEESoundexV5.pdf is an abstract about Approximate Sting Matching that fired my curiosity about the subject, and pertains to the package.
VBAlgorithms.txt contains the entire suite of algorithms in Visual Basic extracted from the MDB modules.
The PowerPoint presentations describe the workings of the MDE and give a good overview of Fuzzy Matching.
To match is divine....
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Aug 22, 2006
Hi all,
I've got two vast tables of data which I need to link, however the field unique to each was, at it's source, a typed field, and as such both have errors, typos, formatting problems, known deviations etc.
An example would be something like this:
Table1: SFOC0912JB3
Table2: F0CO9I2JB3
(These are harware serial numbers for what it's worth). I could do with creating a link between the two tables which would return a true based on a number of possibilities, such as:
Match if:
- String matches with prepended 'S', 'C' and/or
- String matches with substituted 'I' and '1' in any or all positions and/or
- String matches with substituted 'O' and '0' and/or
etc.
I think Levenshtein had the right answer from what I've been reading, but I haven't yet found an implementation for access (freely) available.
Any ideas?
Thanks,
Alex
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Jun 5, 2007
I have this query in design view and in an asp page and it works fine:
SELECT dbo_feedback.*, dbo_origin.originName, dbo_product.prodname, dbo_category.catName FROM dbo_product INNER JOIN (dbo_origin INNER JOIN ((dbo_feedback INNER JOIN (dbo_category INNER JOIN links_cat ON dbo_category.catID = links_cat.CatID) ON dbo_feedback.id = links_cat.FeedbackID) INNER JOIN links_product ON dbo_feedback.id = links_product.FeedbackID) ON dbo_origin.originID = dbo_feedback.origin) ON dbo_product.prodID = links_product.ProductID;
BUT, I want to return all feedback entries, even if they have no matching Product or Category. :confused: When I change the inner joins to outer joins I get a syntax error in the browser window. I changed the join type in the relationship diagram in Access and tried to recreate this in query designer, but Access says the statement cannot be executed because of ambiguous outer joins.
FYI, one feedback can have many products, many categories, and only one origin. I have the joins correct and enforced.
Please help, thanks!!!
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Jun 1, 2005
I have a form that has code tied to the 'on open' event that is going to be accessed by users where we want them to only have access to certain fields which we want them to fill out. The fileds that will be locked will change based on the field called 'Item Number'. The code will be long because there are 30 different Item Numbers and about 10 to 20 fields that we will disable based on the Item Number. The code is like:
Dim Item_Number As String
If Me.Item_Number = "32000" Then
Me.Batch_Lot_Number.Enabled = False
End If
This is all great except that the disable makes the field kind of obscure by the color it gives it. I don't want to use the lock property because that doesn't give you a visual clue that its locked.
Is there a way to change the color of the field background using VBA?
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Jan 7, 2007
Many have had questions on how to use this for their own purposes.
Link to the original post:
http://www.access-programmers.co.uk/forums/showthread.php?t=103279
Download at: http://www.kdkeys.net/forums/thread/6450.aspx
Here is how you can use it - I provide this example:
Tables and queries can be created in the MDE database.
Create a table with known good reference strings. I created this one - REF_LIST.
It has one field, REF_STRING (Text) with a length of 50, and indexed (No Duplicates). The field length can be set to a length that suits your requirements.
This is the content:
REF_STRING
Claw Hammer
Cold Chisel
Monkey Wrench
Nail Gun
Create another table with strings to match. I created this one - TEST_LIST.
It has one field, TEST_STRING (Text) with a length of 50, and indexed (Either No Duplicates or Duplicates Ok depending on the data). The field length can be set to a length that suits your requirements.
This is the content:
TEST_STRING
Claw Hamer
Claw Hammr
Clew Hammer
Clw Hammer
Cold Chisil
Cold Chisle
Cold Chissel
Cole Chisel
Monkey Wrnech
Monkie Wrench
Monky Rench
Nail Gn
Nail Gunn
Naill Gun
Nial Gun
Then create another table for the results. I created this one - RESULTS.
It has four fields, REF_STRING (same properties as in table REF_LIST), TEST_STRING (same properties as in table TEST_LIST), MATCH_VALU (Single, Fixed, 2 decimal places), and GOOD_MATCH (True/False).
This is the content from the results of the Match_Lists query.
REF_STRINGTEST_STRINGMATCH_VALUGOOD_MATCH
Nail GunNial Gun0.92No
Monkey WrenchMonky Rench0.94No
Monkey WrenchMonkie Wrench0.94No
Claw HammerClew Hammer0.94No
Cold ChiselCold Chisle0.94No
Cold ChiselCold Chisil0.94No
Cold ChiselCole Chisel0.94No
Nail GunNail Gn0.95No
Monkey WrenchMonkey Wrnech0.95No
Nail GunNail Gunn0.96No
Nail GunNaill Gun0.96No
Claw HammerClaw Hamer0.96No
Claw HammerClaw Hammr0.96No
Claw HammerClw Hammer0.96No
Cold ChiselCold Chissel0.97No
SQL from the Match_Lists query:
INSERT INTO RESULTS ( REF_STRING, TEST_STRING, MATCH_VALU )
SELECT REF_LIST.REF_STRING, TEST_LIST.TEST_STRING, IsSimilar([REF_STRING],[TEST_STRING]) AS Expr1
FROM REF_LIST, TEST_LIST
WHERE (((IsSimilar([REF_STRING],[TEST_STRING]))>0.79));
Using this example you can populate the two tables, REF_LIST and TEST_LIST with strings that you need to compare and run the Match_Lists query.
The GOOD_MATCH field in the RESULTS table is for you or another human to determine if anything questionable is a good match for your purposes.
If it is found that any match with a value of at least .95 is a good match then an update query could be created to update the GOOD_MATCH field with true for all those with a value of >= .95.
Then a select query could be created to look at those matches that do not have a GOOD_MATCH to determine if they may be good matches.
Naturally the two tables may need a unique ID for the strings for better tracking and comparing.
If so, create them and have them appended to the RESULTS table as well in the Match_Lists query.
OpnSeason
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Mar 5, 2006
Hello All,
For those who are interested in Approximate String Matching or those who could use these algorithms; I have a complete
suite of Approximate String Matching algorithms written in Visual Basic in an Access database.
In 2004 I decided to jump into the world of Fuzzy Matching with both feet.
As it is, I am working for a company that deals with names, addresses, etc. very intensely. It is a fair sized company
that uses Access on a grand scale. Since I am an Access programmer, I work in an Access gold mine!
I knew that if I could get a good handle on Fuzzy Matching, that when I hit the right person at the right time, the
company could greatly benefit from my research on Fuzzy Matching. The right time and the right person are not here yet.
Nevertheless, since I have reaped much free source code and information from the Web, it is now time to return the
favor.
I developed a package that is sort of a demo/tutorial on Approximate String Matching algorithms in Access that is very
robust in Fuzzy Matching. It would overtax the post in this forum for me to include it in a post.
To summarize, it works with the basic name - Last, First, and Middle. It has a user interface that allows a user to
type in what would be a good name and what would be a questionable name to resemble the good name. The weighted results of all the various algorithms can be chosen, or an individual algorithm can be chosen to display how closely the names match.
In addition, it has a table of 17,295 known good names with unique ID numbers as a reference table, and table of 1200
morphed names that are typical of names entered in a database with no input conventions. These morphed names have typos, transpositions, variations on maiden names, etc. 1200 good names were selected for alteration and the unique ID of each original good name was stored in the table with the altered names to determine the accuracy of the matching
process.
The morphed names were compared to the known good names in a query with an approximate join using the suite of
algorithms to determine match percentage. The altered names, the ID number of the original good name, the ID number of the name it matched to, and the match percentage were stored in a results table to determine the results of the matching run.
These tables were used to test and tweak the algorithms by comparing the morphed names with the known good names. The results of 1322 names were saved to a results table with match scores.
The matching process was executed in a query with an approximate join using the suite of algorithms.
The match results:
Total Approximate Matches: 1188
(Recall) Precision Pct: 99.00%
Total Unmatched Names: 12
Unmatched Pct: 1.00%
Total Other Matches: 134
Other Matches Pct: .77%
The tables are accessible in the database, so anyone can run their own tests. The interface is set up to accommodate this as well.
The algorithms used: Dice coefficient as a threshold algorithm, Levenshtein Distance algorithm, Longest Common
Subsequence, and the DoubleMetaphone. The names were passed to the algorithms by way of the bigram model.
I will email it to anyone who requests it.
It is in two platforms, Office 97 and Office 2000 as FuzzyMatching97.zip (692 KB) and FuzzyMatching2k.zip (721 KB).
The zip files include ApprxStrMatchingEngine97.pps or ApprxStrMatchingEngine2k.pps respectively, StrMatching97.mde or StrMatching2k.mde respectively, IEEESoundexV5.pdf, and VBAlgorithms.txt.
IEEESoundexV5.pdf is an abstract about Approximate Sting Matching that fired my curiosity about the subject, and
pertains to the package.
VBAlgorithms.txt contains the entire suite of algorithms in Visual Basic extracted from the MDB modules.
The PowerPoint presentations describe the workings of the MDE and give a good overview of Fuzzy Matching.
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Aug 14, 2007
Hi again,
I just restructured my DB and I was wondering if anyone can give me some advice on whether or not my joins/relations are correct. I left some joins/relations out because I wasn't sure what relation I should use.
Any Advice will be greatly appreciated
18418
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Sep 21, 2004
I am trying to create a simple Search form in Access where a user can select a desired record and query multiple tables using the inputs.
I would like them to be able to query Retailers, Distributors and Products.
The 6 tables are linked as follows:
Although some of these tables are not included in the query, they are required to ensure relationships.
Retailers -- Uses (RetailerID,DistributorID) -- Distributors
Retailers -- Orders (RetailerID,ProductID) -- Products
All retailers have at least one distributor BUT a retailer may or may not have ordered any products.
I have created my form but the query linked to the form is having some trouble. It is only selecting those records that have ordered products. For example, if I query a retailer name only and it does not have any ordered products, it will not display. Is there a problem with the table joins? The SQL for the query is displayed here:
Code:
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Feb 2, 2005
Hello,
My problem is rather complicated and I am not sure if Access is even capable of addressing it. As I said, this is a bit tricky and I understand if no one is willing to tackle it, however, I would really appreciate it if someone could tell me it is impossible if that is the case. Thanks in advance.
I have attached a table to better explain my dilemma.
I would like to use the information in the “Category”, “Range Start” and “Range Stop” fields to generate new identifiers for each record in the table. The simplest criteria would be to assign the same novel identifier to two records if they have the same values in all of “Category”, “R. Start”, “R. Stop” (This is the case for the first two records.).
I am able to use this approach but would much rather use a more sophisticated set of criteria. Specifically, to be assigned the same ID two(or more) records must:
A) Belong to the same category.
B) Their ranges must overlap by more than (x)(Where x is some amount of overlap). E.g. Records 3 and 4 should be assigned the same ID because their categories are the same and their ranges overlap by 333 (13222-12889).
C) Finally, if A is satisfied and B is not then the then records could be assigned the same identifier if the difference between their ranges is less than some value (y). E.g. Records 5 and 6 should be grouped because A) is satisfied and their ranges are only 5 apart -> (119-300)…(305-700)
There is no limit to the number of records that may be assigned the same identifier, provided they satisfy criteria A+B or A+C.
Many thanks,
Matt
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Feb 5, 2008
Hi there,
Consider 2 simple tables
Name ID Pet
A 00 dog
B 11 cat
C 22 hamster
Name ID hasJob
A 00 no
B 11 yes
D 33 yes
how do I make a join to get this table?
Name ID Pet hasJob
A 00 dog no
B 11 cat yes
C 22 hamster --
D 33 -- yes
Help much appreciated.. thank you
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Oct 16, 2006
Hey everyone! I just have a relatively quick question.
Situation:
I have a database where i have 2 tables. One table has items in one column, and the width, length, and height of the item. Another table has the exact same fields, except the only items are ones that need updated as far as their dimensions. The fields with those items include their new dimensions. How can I create a query to pull down all of the items with the correct dimensions?
Any help is greatly appreciated!
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Apr 15, 2008
I've got a table with a self join which represents a tree structure that can have variable depth.
I want to get a spreadsheet view of this for project review meetings. I can do a bunch of nested queries until I get all the branches but i would like something a little more dynamic, i.e. something that will automatically show the spreadsheet view of all branches no matter the depth of the tree.
So anyone got any suggestions on how to handle this?
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Apr 29, 2008
Hi Kids i'm a Newbie so be nice!
Only been using Access for a little over 6 months. It's an ongoing struggle but a worthy string to my bow.
I have been using a simple join to filter out matching fields from a bigger table that exist in a smaller table. If you like i create the smaller table around what i need to see from the bigger one. I hope that makes sense.
So what i want to achieve now is what i'm calling a "compliment join". This is where i use the smaller table to filter from the bigger table but I am left with everything but what was in the smaller table.
Any ideas...??
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May 9, 2007
Hi All,
Can anyone help me. I have a database table called orders. This contains and order status id. In a separate table i have the order status id and the what the id means i.e delivered, awaiting payment etc.
I need a record set that returns all the fields from the order table and the actual order status not the order ID.
I know i need to use a inner join but just can get it right.
Can anyone help me with this.
This is what i have but it return nothing:
Code:SELECT a.*, c.OrderStatusFROM Orders AS a INNER JOIN OrderStatuses AS c ON a.OrderStatusID = c.OrderStatusIDORDER BY OrderDate desc
EDIT:
Actually that is right and it does what, stupid me, frazzled brain at this time of night.
What i actually meant was how can i also pull the customers name from the database table Customer, based on the orderID?
Thanks in advance
Tom
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May 12, 2005
I have a form with a drop down menu of people to filter a report of projects with the managers and up to 3 assistant managers. When I choose someone from the dropdown menu, I want all of their projects to come up on the report. Currently, only the projects that person is managing come up, not the ones they are assistant managing.
In my query that is powering this report, I have joined the manager_id number in table A to an id_num field in table B. To make the assistant managers come up in the report, I need to join the assist1_id, assist 2_id, and assist3_id to id_num also. When I join assist1_id to id_num, I get the following error:
The SQL statement couldn't be executed because it contains ambiguous outer joins. To force one of the joins to be performed first, create a separate query that performs the first join and then include that query in the SQL statement.
The way I would like to fix this problem is by creating subqueries in the SQL view, but I don’t know how to code it. If you know how or if you know a better way of doing this, please help! :)
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Nov 9, 2005
I would like to know the difference between these two concepts.
Would anyone care to explain it to me?
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Dec 5, 2005
Is there a limit to the number of joins allowed in a query?
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Feb 4, 2007
hi
i have 4 tables: tbEmploye, tbCirculaire, , tbCategorie, lienCirculaireEmploye
tbCategorie (every circulaire have a category)
-cirIdCategorie
-cirCategorie
tbEmploye
- empID
- empPrenom
- empNom
- empNumeroEmploye
- empMotPasse
tbCirculaire
- cirID
- cirIdCategorie
- cirNumero
- cirDescription
- cirDate
- cirNomFichier
lienCirculaireEmploye (link circulaire to employe
- cirNumero
- empNumeroEmploye
- dateLecture
SELECT tbCirculaire.cirNumero,
tbCategorie.cirCategorie,
tbCirculaire.cirDescription,
tbCirculaire.cirNomFichier,
tbCirculaire.cirDate,
tbEmploye.empNumeroEmploye,
tbEmploye.empPrenom ,
tbEmploye.empNom,
lienCirculaireEmploye.dateLecture
FROM (tbCirculaire INNER JOIN lienCirculaireEmploye ON tbCirculaire.cirNumero = lienCirculaireEmploye.cirNumero)
INNER JOIN tbEmploye ON lienCirculaireEmploye.empNumeroEmploye = tbEmploye.empNumeroEmploye
INNER JOIN tbCategorie ON tbCirculaire.cirIdCategorie = tbCategorie.cirIdCategorie
WHERE tbCategorie.cirIdCategorie IN ( 1,2 )
with this query, i get error: 3075
Syntax error (missin operator) in query expression
lienCirculaireEmploye ON tbCirculaire.cirNumero = lienCirculaireEmploye.cirNumero)
INNER JOIN tbEmploye ON lienCirculaireEmploye.empNumeroEmploye = tbEmploye.empNumeroEmploye
INNER JOIN tbCategorie ON tbCirculaire.cirIdCategorie = tbCategorie.cirIdCategorie
any idea?
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May 29, 2007
Wierd Join needed...Here's my problem. it's been bothering for a bit...I have 2 tables, one with a date, and the 2nd table with 2 dates. I need to only pull the records from the 2nd table where the date in the first table come between them.TABLE 1DATEJOB#EMPLOYEE#TABLE2 JOB#EMPLOYEE#STARTDATEENDDATEThe query should take every line from TABLE1 and ONLY the lines from TABLE 2 that qualify.
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Jul 24, 2007
Hello,
I have the following code for a multiple join:
INSERT INTO [AppendAllFields]SELECT [TreatyList].[Treaty] AS [Treaty],[MLAC 42 Treaty Xref ER].[tai treaty] AS [TreatyType],[txn 01/04].[Policy_Number]
(and more other fields from [txn 01/04] table)
FROM [txn 01/04] INNER JOIN [MLAC 42 Treaty Xref ER] ON TRIM([txn 01/04].[Policy_Number]) = TRIM([MLAC 42 Treaty Xref ER].[Polnum])
INNER JOIN [TreatyList] ON TRIM([MLAC 42 Treaty Xref ER].[tai treaty]) = TRIM([TreatyList].[TreatyNo]);
Basically, the txn 01/04 table has a corresponding Polnum field in the MLAC 42 table, and MLAC 42 table has a tai treaty field, which corresponds to TreatyNo in TreatyList table.
However, when I tried to run this, I got an Syntax error.
Could anyone please help?
Thanks!
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Aug 31, 2007
Hi,
I have 3 tables.
From table 1, I join fields A, B, and C to fields A, B, and C on table 2. From Table 2, I join Fields 1 and 2 to Table 3. All the joins are Join 1.
When I pulled (Queried) fields D, E, and F from Table 1, field D from Table 2, and field D from table 3, I have a sum of $1000 under field (column) E from Table 1.
The second time I pulled data, I added fields A and B from table 1 to the query. However, I get a total of $1500 from the same column. i.e Field E from Table 1. I can understand that there will be more rows to provide further data breakdown, but I could not understnad why the total change.
Please help.
Thanks.
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Sep 4, 2007
Hi all,
Simple problem, but my access and sql skills are very limited.
I have two tables. One containing a group of frequent customers with a column called 'member status'. Another table containing a group of non-customers. The addresses in both tables have been matched using group1 software.
I would like to create a query that shows me all the customers with 'member status' = 'A' and all the non-customers who live at the same address.
When i run the query, everybody comes up as 'member status'=A. I think this is because there is no 'member status' field in the non-customers table, and i have failed to make the appropriate join or parameters. Is there a way to design a query that will show 'member status' for those who have it, and will display a null for those who do not?
Any help is appreciated thank you!
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Dec 4, 2007
Good day all
I have a simple query linking two tables using the primary keys from each. The problem is that every time I go into design mode of the form that uses the query to populate a list box I get a Data Type Mismatch error and when I look at the query, Access has changed the join from the Pk in one table to the field after the PK in the other field. I have attached an image to show the change. Note that the join should be from the first fields on each table. I am really stuck with this guys, it is gettin me down and preventing me from developing the database further and my boss is on my case. Can anyone please help me? I have checked all the table relationships and they are fine. Thank you.
Gareth:(
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Jul 26, 2005
Attached is a pdf of the query window showing the relationships and table structure; (sorry for the quality) the linkage is also permanent at the relationship window. I created a form (columnar) of Rooms; loaded a subform (columnar) of the projects; and then loaded the students (tabular) as a subform on the projects subform. The data entry is flawless; tabs through each field and form to form in sequence.
After entering several rooms data I tested it at the query level by loading the three tables: rooms, projects, and students, and the permanentely established linkage with junctions came in automatically. I thought I was home free--but when I run the query, I get zero records.
When I attempt various joins, thinking this will yeild all records from the many tables and their match, I get "ambiguous outer joins" and it says to run a separate query and add it to the SQL Statement?
Thanks for any help,
Almost funtional in Ann Arbor........
Oh, and thanks Pat Hartman for the tip on linkage -- although I may have screwed it up anyway.
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