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03/24/2008 at 09:59AM PDT, ID: 23264565
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9.0

MS Access SQL Query -- sorting question

Asked by trcamp in Microsoft Access Database, Microsoft Excel Spreadsheet Software, Databases Miscellaneous

Hi,

I need to create an Access SQL query that pulls only selected records from a table.  My table contains the following:

"Location", "parameter", date parameter was sampled ("date"), and parameter result ("result")

There are numerous "locations" in the db.  And each location has numerous "parameters" that are sampled periodically (iron, calcium, mercury, etc).  And, each parameter has numerous sample dates associated with it.

I need a query that will show me 2 things:

1) First I need to see all parameter results for each location, and their associated sample dates.  That's easy and it would look like this:

location        parameter         date sample collected     sample result
Location 1     parameter A     Oct 5, 2001                        20
Location 1     parameter A     Jan 2, 2002                       10
Location 1     parameter A     Nov 6, 2005                       50
Location 1     parameter B     Oct 5, 2001                         1
Location 1     parameter B     Oct 9, 2002                         2
Location 1     parameter B     Dec 5, 2004                        8
Location 1     parameter C     Oct 5, 2001                     1000
Location 1     parameter C     Oct 8, 2001                      3000
Location 2     parameter A     Oct 5, 2001                          40
Location 2     parameter A     Jan 2, 2002                          20
Location 2     parameter B     Nov 6, 2005                         14
Location 2     parameter B     Nov 9, 2005                         12
Location 2     parameter C     Nov 6, 2005                     1800
Location 3     parameter A     Apr 3, 2006                          30

2) Second, I need:

A list of distinct (location/parameter) and the associated median result from all sample dates for that location and parameter.  (Note:  If only one result  exists for a given location and parameter then that single value should be used as the median.  So, using the example above, my result would be:

location         paramter        median result
Location 1     Paramter A     20
Location 1     Paramter B      2
Location 1     Parameter C    2000
Location 2     Parameter A     30
Location 2     Parameter B     13
Location 2     Parameter C     1800
Location 3     Parameter A     30

Please let me know if you need any additional description.  I have attached a sample excel spreadsheet that looks just like my Access database.  Thanks in advance!

Ted

Attachments:
 
need-a-query.xls (2.7 MB) (File Type Details) 
excel spreadsheet that looks like my MS Access table
 
[+][-]03/24/08 11:05 AM, ID: 21195382

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[+][-]03/24/08 11:08 AM, ID: 21195418

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[+][-]03/24/08 11:53 AM, ID: 21195814

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About this solution

Zones: Microsoft Access Database, Microsoft Excel Spreadsheet Software, Databases Miscellaneous
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Solution Provided By: cactus_data
Participating Experts: 2
Solution Grade: A
 
 
[+][-]03/24/08 11:57 AM, ID: 21195837

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