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MS Access find Top Value with group and associated record data

Posted on 2013-01-15
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Last Modified: 2013-01-16
HI Everyone,

I have a query to construct in which I have two tables, tbl 1 has two fileds, both unique, ID and Item.  Table 2 has four fields, ID, Item, Perc, CCode.

The two tables have a one to many relationship on the Item field
tbl1.item(unique) = tbl2.item(multiple)

I need to query for
tbl1.item
tbl2.Perc (top value in group by Item)
tbl2.CCode

I can get the Item and the Top 1 Perc by using MAX, however if I want to also see the corresponding CCode for the max record, my query expands to allow more records.   I tried using FIRST for my CCode, but that too brought in mixed data.

Any thoughts on how I accomplish this?

Thanks,

MC
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Question by:MCaliebe
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7 Comments
 
LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 38779690
select T.*
from tbl2 as T
inner join
(select max(t2.perc) as MaxPerc, item from tb2 t2 group by t2.item) as t1
on t.perc=t1.maxPerc and t.item=t1.item
0
 

Author Comment

by:MCaliebe
ID: 38779905
Thanks for the help Cap, but I coudln't get it to work.  I enclosed a sample DB for you to look at.

My query results should be
Table1.Item_Number (all records)

Join to Table2.Item_Number

Table2.%ofTot(max number based on group of all like item_numbers)
Table2.C_Code
sample.accdb
0
 
LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 38779946
run query2
sampleRev.accdb
0
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LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 38779976
better use this, run query3
sampleRev.accdb
0
 

Author Comment

by:MCaliebe
ID: 38782376
Query 2 appears to be doing fine for me.

Can you take a min to explain what your doing here?  If you know of an article worth reading on constructing these temp queries, I'd appreciate it.

I'm using this one
SELECT T.*
FROM table2 AS T
INNER JOIN
(select max(t2.[%ofTot]) as MaxTot, item_number from  table2 t2 group by t2.item_number)  AS t1
ON (T.item_number = t1.item_number) AND (T.[%ofTot] = t1.maxTot);


Query 3 seems to be even more complicated.
0
 
LVL 120

Accepted Solution

by:
Rey Obrero (Capricorn1) earned 1400 total points
ID: 38782667
this part
SELECT T.*
FROM table2 AS T


just select everything from table2 and give it an alias T (T contains all records from table2 in memory)


this part, a sub query

(select max(t2.[%ofTot]) as MaxTot, item_number from  table2 t2 group by t2.item_number)  AS t1

gets the maximum value of [%ofTot] and grouped by item_number  and was given an alias of t2 (t2 contains the records from table2 using a Max and group by aggregates in memory)

then the two set of recordset were join on this line

ON (T.item_number = t1.item_number) AND (T.[%ofTot] = t1.maxTot);


it is just like creating a two tables and creating a query that joins the two table using two fields
0
 

Author Closing Comment

by:MCaliebe
ID: 38782696
Thanks for the additional information!
0

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