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Get the closest number

Posted on 2010-08-25
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Last Modified: 2013-11-29
Hi,
Need to find the closest number to numbers in one table to the list of numbers in another table (ms access).  For instance, I have 2 tables:
TABLE A
ID       NAME        PRICE
1          ABC             200
2         KSS              280
3         LKI                390
3         LKI                375
3         LKI                250
4         POY              600
4         POY              576
5         JIK                 200

But table B has uniquie ID and single row for every Price.
TABLE B
ID       NAME        PRICE
1         ABC             300
2         KSS              260
3         LKI                379
4         POY              492
5         JIK                 280
                 
So when I join these 2 tables using the ID, I would like to get the closest Price in Table A.  In other words, If Table A has multiple Prices then I want to see only the Price that is closest to the Price from Table B.  So here is what I would like to see in the final results:
FINAL RESULTS
ID       NAME        PRICE
1         ABC             200
2         KSS              280
3         LKI                375
4         POY              576
5         JIK                 200

Thanks for your help
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Question by:karinos57
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24 Comments
 
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Expert Comment

by:Patrick Matthews
ID: 33525042
What would you do in this case?TableAID     NAME          PRICE6      XYZ              2506      XYZ              350TableBID     NAME          PRICE6      XYZ              300In this case, there are two records that could stake a claim to being "closest"...
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Expert Comment

by:Patrick Matthews
ID: 33525050
Is it safe to assunme that TableB has at most one record for any given ID?
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Expert Comment

by:dwe761
ID: 33525063
what do you want if one of the IDs has a price higher that is the same difference as one lower.

For instance:

TABLE A
ID       NAME        PRICE
3         LKI                300
3         LKI                100

TABLE B
ID       NAME        PRICE
3         LKI                200
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Expert Comment

by:Patrick Matthews
ID: 33525078
dwe761,I see we think alike :)Patrick
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Expert Comment

by:dwe761
ID: 33525098
matthewspatrick:
Except that you usually type 2 minutes faster than I do.

(-:
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Expert Comment

by:dwe761
ID: 33525330
select x.ID, x.Name, MIN(x.Price)
 FROM
(
      SELECT     b.ID, b.Name, a.Price, MIN(ABS(b.Price - a.Price)) AS diff
      FROM         TableA AS a INNER JOIN
                                                 TableB AS b ON a.ID = b.ID
      GROUP BY b.ID, b.Name, a.Price
) x
INNER JOIN
(
      SELECT     b.ID, b.Name, MIN(ABS(b.Price - a.Price)) AS diff
      FROM         TableA AS a INNER JOIN
                                                 TableB AS b ON a.ID = b.ID
      GROUP BY b.ID, b.Name
) y
ON x.ID = y.ID and x.Name = y.Name and x.diff = y.diff
group by x.ID, x.Name
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Author Comment

by:karinos57
ID: 33525426
thanks guys, both of you had asked good question.  If that is the case then i will always go by the lesser price.  thanks for your help.
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Expert Comment

by:dwe761
ID: 33525465
Then my original suggestion works as it is.
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Expert Comment

by:dwe761
ID: 33525567
I noticed that your question was asked in the Access zone.  My apologies, I gave you a query in SQL.  If you had problems with my original query, try pasting this one into a new Access query.  Of course, you'll have to change the name of TableA and TableB to your own table names.


SELECT x.ID, x.Name, Min(x.Price) AS MinOfPrice
FROM 
[
SELECT     b.ID, b.Name, a.Price, MIN(ABS(b.Price - a.Price)) AS diff
FROM         TableA AS a INNER JOIN
 TableB AS b ON a.ID = b.ID
GROUP BY b.ID, b.Name, a.Price
]. AS x 
INNER JOIN
[SELECT     b.ID, b.Name, MIN(ABS(b.Price - a.Price)) AS diff
FROM         TableA AS a INNER JOIN
 TableB AS b ON a.ID = b.ID
GROUP BY b.ID, b.Name
]. AS y 
ON (x.diff = y.diff) AND (x.Name = y.Name) AND (x.ID = y.ID)
GROUP BY x.ID, x.Name;

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Expert Comment

by:Patrick Matthews
ID: 33525643
Here is what I was working on before getting distracted by a call.  Seems to work, and in case of a tie will return the lower price.
SELECT a1.ID, a1.NAME, Min(a1.PRICE) AS Price
FROM (TableA a1 INNER JOIN 
    TableB b1 ON a1.ID = b1.ID) INNER JOIN 
    (SELECT a2.ID, Min(Abs([a2].[Price] - [b2].[Price])) AS MinDiff
    FROM TableA AS a2 INNER JOIN 
        TableB AS b2 ON a2.ID = b2.ID
    GROUP BY a2.ID) AS q ON b1.ID = q.ID
WHERE Abs(a1.Price - b1.Price) = q.MinDiff
GROUP BY a1.ID, a1.NAME

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Author Comment

by:karinos57
ID: 33534896
thanks guys.  both of you have provided the correct solution but i am having a little problem when i try to change the field names.  I am getting an error in both queries.  Pls. see attached.  Also, is there a way to include the Tier Desc in the output?  thanks
Test.zip
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Expert Comment

by:dwe761
ID: 33534949
Sorry, I don't have as new of a version of Access so could not open your file.  Could you just paste your query (in SQL form)  into the post?  We can probably figure it out from that.
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Author Comment

by:karinos57
ID: 33535046
here it is.  It says "enter prameter value" for x.last price
SELECT x.[LINE NUMBER], x.[Formatted NDC], Min(x.[Last Price]) AS MinOfPrice

FROM (SELECT     b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff

FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]

GROUP BY b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG]
)  AS x INNER JOIN (SELECT     b.[LINE NUMBER], b.[Formatted NDC], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff

FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]
GROUP BY b.[LINE NUMBER], b.[Formatted NDC]
)  AS y ON (x.diff = y.diff) AND (x.[Formatted NDC] = y.[Formatted NDC]) AND (x.[LINE NUMBER] = y.[LINE NUMBER])
GROUP BY x.[LINE NUMBER], x.[Formatted NDC];

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Expert Comment

by:dwe761
ID: 33535149
x is the name given for the first query.  So if you reference a field from x ([Last Price] it has to be in the query output.  So try adding that field as I've done and see if that fixes your problem.
SELECT x.[LINE NUMBER], x.[Formatted NDC], Min(x.[Last Price]) AS MinOfPrice

FROM (
SELECT     b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG], a.[Last Price], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff

FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]

GROUP BY b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG]
)  AS x 

INNER JOIN (

SELECT     b.[LINE NUMBER], b.[Formatted NDC], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff
FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]
GROUP BY b.[LINE NUMBER], b.[Formatted NDC]
)  AS y 

ON (x.diff = y.diff) AND (x.[Formatted NDC] = y.[Formatted NDC]) AND (x.[LINE NUMBER] = y.[LINE NUMBER])
GROUP BY x.[LINE NUMBER], x.[Formatted NDC];

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Expert Comment

by:dwe761
ID: 33535166
Oops.  It must be in the Group By as well.
SELECT x.[LINE NUMBER], x.[Formatted NDC], Min(x.[Last Price]) AS MinOfPrice

FROM (
SELECT     b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG], a.[Last Price], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff

FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]

GROUP BY b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG], a.[Last Price]
)  AS x 

INNER JOIN (

SELECT     b.[LINE NUMBER], b.[Formatted NDC], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff
FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]
GROUP BY b.[LINE NUMBER], b.[Formatted NDC]
)  AS y 

ON (x.diff = y.diff) AND (x.[Formatted NDC] = y.[Formatted NDC]) AND (x.[LINE NUMBER] = y.[LINE NUMBER])
GROUP BY x.[LINE NUMBER], x.[Formatted NDC];

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Author Comment

by:karinos57
ID: 33535230
i am getting this one now: "enter prameter value" for a.last price
0
 
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Expert Comment

by:dwe761
ID: 33535270
My bad.  Should be b.[Last Price]
SELECT x.[LINE NUMBER], x.[Formatted NDC], Min(x.[Last Price]) AS MinOfPrice

FROM (
SELECT     b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG], b.[Last Price], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff

FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]

GROUP BY b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG], b.[Last Price]
)  AS x 

INNER JOIN (

SELECT     b.[LINE NUMBER], b.[Formatted NDC], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff
FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]
GROUP BY b.[LINE NUMBER], b.[Formatted NDC]
)  AS y 

ON (x.diff = y.diff) AND (x.[Formatted NDC] = y.[Formatted NDC]) AND (x.[LINE NUMBER] = y.[LINE NUMBER])
GROUP BY x.[LINE NUMBER], x.[Formatted NDC];

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Author Comment

by:karinos57
ID: 33535458
dwe761,
thanks man, the query is wokring now but the result are wrong.  it is producing all the price in the member_data table.  it is not showing the closest number.  The member_data should be like Table B in my previous post.  
Final Combined table
Line Number      Formatted NDC      INCENTIVE PRICE PKG      Tier Desc
1      00944293201      $0.69      tier1
2      15584010102      $200.00      tier4
3      00049399063      $484.42      tier1
4      00004035234      $524.00      tier3
5      61958070105      $365.00      tier5
6      59148001016      $542.00      tier8
7      00002442037      $800.28      tier2
7      00002442037      $775.01      tier1
7      00002442037      $825.55      tier9
8      00002441538      $581.26      tier8
8      00002441538      $600.21      tier10
8      00002441538      $619.16      tier5
9      00004035009      $254.00      tier2
10      00004035010      $58.00      tier9

memeber data table
Line Number      Last Price      Formatted NDC
1      $825.00      00944293201
2      $1,384.00      15584010102
3      $394.00      00049399063
4      $1,592.00      00004035234
5      $887.00      61958070105
6      $545.00      59148001016
7      $729.00      00002442037
8      $542.00      00002441538
9      $398.00      00004035009
10      $358.00      00004035010
0
 
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Accepted Solution

by:
dwe761 earned 2000 total points
ID: 33535820
OK.  Try this.


SELECT x.[LINE NUMBER], x.[Formatted NDC], Min(x.[INCENTIVE PRICE PKG]) AS MinOfPrice

FROM (
SELECT     b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff

FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]

GROUP BY b.[LINE NUMBER], b.[Formatted NDC], a.[INCENTIVE PRICE PKG]
)  AS x 

INNER JOIN (

SELECT     b.[LINE NUMBER], b.[Formatted NDC], MIN(ABS(b.[Last Price] - a.[INCENTIVE PRICE PKG])) AS diff
FROM         Final_Combined_Table AS a INNER JOIN
 Member_Data AS b ON a.[LINE NUMBER] = b.[LINE NUMBER]
GROUP BY b.[LINE NUMBER], b.[Formatted NDC]
)  AS y 

ON (x.diff = y.diff) AND (x.[Formatted NDC] = y.[Formatted NDC]) AND (x.[LINE NUMBER] = y.[LINE NUMBER])
GROUP BY x.[LINE NUMBER], x.[Formatted NDC];

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Author Comment

by:karinos57
ID: 33536161
works like a charm.  thanks
0
 

Author Closing Comment

by:karinos57
ID: 33536170
thanks
0
 

Author Comment

by:karinos57
ID: 33536843
dwe761,
this last query works fine except it does not solve this issue that you raised before.  See below.  when i run the query it shows both values from Table A as suppose to show only the lesser price.  I think your initial query worked fine and i think something went wrong when we changed the field names.  thanks again for your help.
TABLE A
ID       NAME        PRICE
3         LKI                300
3         LKI                100

TABLE B
ID       NAME        PRICE
3         LKI                200
0
 
LVL 10

Expert Comment

by:dwe761
ID: 33537220
Are you sure you're using my last query sent?  I created your tables with your data.  And I added two rows to Final_Combined_Table
Line Number      Formatted NDC      INCENTIVE PRICE PKG      Tier Desc
1      00944293201      $0.69      tier1
2      15584010102      $200.00      tier4
3      00049399063      $484.42      tier1
4      00004035234      $524.00      tier3
5      61958070105      $365.00      tier5
6      59148001016      $542.00      tier8
7      00002442037      $775.01      tier1
7      00002442037      $800.28      tier2
7      00002442037      $825.55      tier9
8      00002441538      $581.26      tier8
8      00002441538      $600.21      tier10
8      00002441538      $619.16      tier5
9      00004035009      $254.00      tier2
10      00004035010      $58.00      tier9
11      11111111111      $100.00      tier99
11      11111111111      $300.00      tier99

and one row to Member_Data
Line Number      Last Price      Formatted NDC
1      $825.00      00944293201
2      $1,384.00      15584010102
3      $394.00      00049399063
4      $1,592.00      00004035234
5      $887.00      61958070105
6      $545.00      59148001016
7      $729.00      00002442037
8      $542.00      00002441538
9      $398.00      00004035009
10      $358.00      00004035010
11      $200.00      11111111111

These are my results when I ran my last query:

LINE NUMBER      Formatted NDC      MinOfPrice
1      00944293201      $0.69
2      15584010102      $200.00
3      00049399063      $484.42
4      00004035234      $524.00
5      61958070105      $365.00
6      59148001016      $542.00
7      00002442037      $775.01
8      00002441538      $581.26
9      00004035009      $254.00
10      00004035010      $58.00
11      11111111111      $100.00

Isn't this correct?
0
 

Author Comment

by:karinos57
ID: 33542696
i think what is happening is that i added the tiier desc in there and the tier desc are different for the same line number so when group them then it shows both prices.  thanks
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