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How can make MS Access Query that read a table column based on conidtion

Posted on 2014-04-02
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Last Modified: 2014-04-22
I have a table in MS Access that has time related data and I need to select only the pressure at the minimum depth and maximum depth for each well in each time.

Please find the MS Access table attached and I am expecting to have the follwing results from the query.

Well   Date       Depth   Pressure
1     1/1/2013     23        2333
1     1/1/2013    666       46784
1     3/22/2014    2         6768
1     3/22/2014  777       54654
2     4/1/2014    11         2333
2     4/1/2014    888       6768
test123.mdb
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Question by:Mohammed Dallag
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4 Comments
 
LVL 47

Expert Comment

by:Dale Fye (Access MVP)
ID: 39972227
You would start out with an aggregate query:

qryWellDates:
SELECT Well, [Date] as PressDate, Min([Depth]) as MinDepth, Max([Depth]) as MaxDepth
FROM yourTable
GROUP BY Well, [Date]

Then, you would join this to your table to get the pressure for those Well/Date combinations

SELECT qryWellDates.Well, qryWellDates.PressDate, qryWellDates.MinDepth as Depth,
             yourTable.Pressure
FROM qryWellDates
INNER JOIN yourTable
ON qryWellDates.Well = yourTable.Well
AND qryWellDates.PressDate = yourTable.[Date]
AND qryWellDates.MinDepth = yourTable.[Depth]
UNION ALL
SELECT qryWellDates.Well, qryWellDates.PressDate, qryWellDates.MaxDepth as Depth,
             yourTable.Pressure
FROM qryWellDates
INNER JOIN yourTable
ON qryWellDates.Well = yourTable.Well
AND qryWellDates.PressDate = yourTable.[Date]
AND qryWellDates.MaxDepth = yourTable.[Depth]
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LVL 120

Accepted Solution

by:
Rey Obrero (Capricorn1) earned 500 total points
ID: 39972301
try this query


SELECT A.Well, A.xdate, A.MinOfdepth AS Depth, B.Pressure
FROM (SELECT Table1.well, Table1.xdate, Min(Table1.depth) AS MinOfdepth
FROM Table1
GROUP BY Table1.well, Table1.xdate
UNION ALL
SELECT Table1.well, Table1.xdate, Max(Table1.depth) AS MinOfdepth
FROM Table1
GROUP BY Table1.well, Table1.xdate
Order By 1,2,3
)  AS A INNER JOIN Table1 AS B ON (A.Well = B.Well) AND (A.xDate = B.xDate) AND (A.MinOfdepth = B.Depth)
ORDER BY A.Well, A.xdate, A.MinOfdepth, B.Pressure;



see query1 on your sample db
test123.mdb
0
 

Author Closing Comment

by:Mohammed Dallag
ID: 39997164
very good
0
 

Author Comment

by:Mohammed Dallag
ID: 40016256
I need to change the output of the MS Query to be like the attached file
4-22-2014-12-26-08-PM.jpg
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