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Count unique field values grouped by mach

Posted on 2015-01-31
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Last Modified: 2015-02-02
Using the attached d/b I am trying to write a query that will give me the following:

Grouped by Machine

TestMachine1 - 123 = the result should be 2 because there are two of them for that machine
TestMachine1 - 234 = the result should be 3 because there are three of them for that machine
TestMachine1 - 564 = the result should be 2 because there are two of them for that machine
TestMachine2 - 589 = the result should be 3 because there are three of them for that machine
TestMachine2 - 849 = the result should be 1 because there is one of them for that machine
TestMachine2 - 956 = the result should be 2 because there are two of them for that machine

--Steve
Unique-Values.accdb
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Question by:SteveL13
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Expert Comment

by:rspahitz
ID: 40581706
One way is to create a calculated field that pulls out the machine name, something like:
Machine: Left(YourField, instr("-", YourField)

then sort on this calculated field (hidden) and show YourField
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Accepted Solution

by:
Rey Obrero (Capricorn1) earned 500 total points
ID: 40581723
try this query


SELECT Table1.Machine, Table1.POn, Count(Table1.POn) AS CountOfPOn
FROM Table1
GROUP BY Table1.Machine, Table1.POn;
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Author Comment

by:SteveL13
ID: 40583963
Neither of these suggestions seem to work.  Again the result should be:

TestMachine1 - 123 = the result should be 2 because there are two of them for that machine
 TestMachine1 - 234 = the result should be 3 because there are three of them for that machine
 TestMachine1 - 564 = the result should be 2 because there are two of them for that machine
 TestMachine2 - 589 = the result should be 3 because there are three of them for that machine
 TestMachine2 - 849 = the result should be 1 because there is one of them for that machine
 TestMachine2 - 956 = the result should be 2 because there are two of them for that machine
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LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 40584204
i don't know what you were doing, but the query i posted above will give you this result

Machine                    POn   CountOfPOn
TestMachine 1    123      2
TestMachine 1    234      3
TestMachine 1    564      2
TestMachine 2    589      3
TestMachine 2    849      1
TestMachine 2    956      2
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Author Closing Comment

by:SteveL13
ID: 40584211
Worked.  I had a typo.  When I fixed it all was fine.
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