Question

Filter or select data

Asked by: phileoca

Greetings,

(In the code section, is data from my table.  And I'll up the points before closing the question)

I'm trying to filter data on a form.
 
I have one filter(button) that will show me All items that have pass = false
(1 record)
I have one filter(button) that will show me all items that have pass = true (in code below, it is -1)
(2 records)
Now what I am trying to do is show distinct items that have not passed.
it should only be 2 records, 1 from IT Dept, and 1 from Fixing bugs.

Thanks!

TestID	TestName	      Pass	        DateTaken
20	PS3 Games	      -1	10/2/2009 2:32:41 PM
23	IT dept		
28	Fixing test bugs	0	10/2/2009 2:24:18 PM
28	Fixing test bugs	0	10/2/2009 2:30:44 PM
                                  
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Asked On
2009-10-02 at 15:42:22ID24781766
Tags

Microsoft Access 2003

Topics

Microsoft Access Database

,

Access Forms

,

SQL Query Syntax

Participating Experts
3
Points
55
Comments
10

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Answers

 

by: thenelsonPosted on 2009-10-02 at 15:57:54ID: 25482933

Try:
NZ (Pass) = False

 

by: phileocaPosted on 2009-10-02 at 16:28:15ID: 25483055

Sorry, I can already select  ALL values that have not passed
i use:
   'Me.Filter = "Isnull(Pass)or (Pass = false)"


I don't know how to make it completely clear what I'm saying so i'll try to explain in detail:

What I'm trying to do is 2 things
1) if the item has passed (test ID 20, and 28 in code below) I dont want either of those test ID's to show in the filter.  only test ID 23 should

2) (remove the bottom record from the code below)  Now when I filter I should see 1 record for testID 23, and 1 record for testID 28


so if Pass = true, all TestID for that record should be filtered away.
If pass = false or null, should only see 1 record for each ID


TestID	TestName	Pass	DateTaken
20	PS3 Games	-1	10/2/2009 2:32:41 PM
23	IT dept	0	
28	Fixing test bugs	0	10/2/2009 2:24:18 PM
28	Fixing test bugs	0	10/2/2009 2:30:44 PM
28	Fixing test bugs	-1	10/2/2009 3:24:14 PM

                                              
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by: thenelsonPosted on 2009-10-02 at 16:40:03ID: 25483089

I don't understand.

 

by: LPurvisPosted on 2009-10-02 at 17:19:28ID: 25483189

I follow what you're asking for, however that doesn't clear up everything.
(FWIW your clarification in your last post seems to address more than your original question).

But in your original question you say:
"Now what I am trying to do is show distinct items that have not passed.
it should only be 2 records, 1 from IT Dept, and 1 from Fixing bugs."

So you also want only one row to be returned for each TestID?
And if so, which one? Or do you not want all columns returned - just the TestID and TestName?

 

by: calpurniaPosted on 2009-10-02 at 20:08:20ID: 25483635

I'd suggest making the button click update the record source for your form. (Change 'Tests' to your table/query name and 'Form1' to your form name.) I've used the latest date/time value for DateTaken.

Dim strSQL As String
 
strSQL = "SELECT A.TestID, A.TestName, Max(A.DateTaken)AS DateTaken, A.Pass FROM Tests A WHERE A.TestID NOT IN "
strSQL = strSQL & "(SELECT B.TestID FROM Tests B WHERE B.Pass) GROUP BY A.TestID, A.TestName, A.Pass"
 
Forms!Form1.RecordSource = strSQL

                                              
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by: LPurvisPosted on 2009-10-03 at 05:31:13ID: 25485024

Well, Karen's gone with assuming you want the most recent Date for each given TestID returned (very likely not an unreasonable assumption - you'll know how you want to go with it yourself of course...). We'll stick with that assumption, but just discuss the implementation for a moment though...

Though the temptation is to create a query like that (the simplicity and non-corrolated nature of the subquery can make it seem unlikely to have a more efficient alternative) - but the Not In operator can't be optimised by the database engine. And if TestID is indexed in your table (which surely it should be - it's crucial and being queried upon) then you'll lose that benefit.

Though I'd usually recomment a Frustrated Outer Join in favour of that:

strSQL = "SELECT A.TestID, A.TestName, Max(A.DateTaken) AS DateTaken, A.Pass "
strSQL = strSQL & "FROM Tests A LEFT JOIN (SELECT B.TestID FROM Tests B WHERE B.Pass) X ON A.TestID = X.TestID "
strSQL = strSQL & "WHERE X.TestID Is Null  "
strSQL = strSQL & "GROUP BY A.TestID, A.TestName, A.Pass"

But if you have a good lot of rows then I'd actually lean more towards a Not Exists. Though corrolated - this [i]is[/i] optimisable and that can make all the difference!

strSQL = "SELECT A.TestID, A.TestName, Max(A.DateTaken) AS DateTaken, A.Pass FROM Tests A "
strSQL = strSQL & "WHERE NOT EXISTS "
strSQL = strSQL & "(SELECT Null FROM Tests B WHERE B.Pass AND B.TestID = A.TestID) "
strSQL = strSQL & "GROUP BY A.TestID, A.TestName, A.Pass"

See how you go.

 

by: phileocaPosted on 2009-10-05 at 08:05:57ID: 25495960

>>So you also want only one row to be returned for each TestID?
Actually that was in the main question. read the last 2 lines.

Thank you LPurvis for going more into detail about my options. Since there is not a "filter" to apply for this data, I'm just going to program through a recordset instead. This will allow me to programatically filter out all the failed tests where it has a record of the same test ID that passed. And then I can toss in your not exists line of code and test it.

    'append data to a temp table.
    '1st recordset to select * From Tests Where Pass = true
    'do until rs.eof
    'rs.movefirst
        '2nd recordset to select * from tests
        'rs2.movefirst
        'delete record where rs2.testID = rs.testID
        'rs2.movenext
    'rs.movenext
    'Loop
                                              
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by: phileocaPosted on 2009-10-05 at 13:38:10ID: 25499456

For future reference,

I put all data into a temp table
set the  recordset  = where (pass = true)
Then I delete all record from temp table where testID = rs.fields('TestID') because i don't need those test ID's

if recordset is empty, then i put all data that is groupable into the temp table only.

I used part of LPurvis's idea, but instead changed the query to group the data.  The grouped query is now the form data source, and I'm still able to use all the previous filters i created.



Private Sub cmdViewOpen_Click()
 
    Dim strCommand As String
    Dim lngField As Long
    Dim db As Database, rs As Recordset
    Set db = CurrentDb()
 
    EmptyTable "locTestsAvailable"
    
    'copy all test data
    strCommand = "INSERT INTO locTestsAvailable ( Pass, DateTaken, Score ) "
    strCommand = strCommand & "SELECT qTakeTestsAvailableTest.*, TestScores.Pass, TestScores.DateTaken, TestScores.Score "
    strCommand = strCommand & "FROM TestScores RIGHT JOIN qTakeTestsAvailableTest ON (TestScores.TestID = qTakeTestsAvailableTest.TestID) AND (TestScores.UserName = qTakeTestsAvailableTest.UserName)"
    DoCmd.RunSQL strCommand
    
    DoCmd.SetWarnings False
    Set rs = CurrentDb.OpenRecordset("SELECT * FROM locTestsAvailable WHERE ((Pass) = True)")
    If rs.RecordCount > 0 Then
        rs.MoveFirst
        Do Until rs.EOF
            lngField = rs.Fields("TestID")
            
            DoCmd.RunSQL "DELETE * FROM locTestsAvailable WHERE ((TestID) = " & lngField & ")"
        
            rs.MoveNext
        Loop
    Else
        'If no test have passed, select groupable data
        EmptyTable "locTestsAvailable"
        
        strCommand = "INSERT INTO locTestsAvailable "
        strCommand = strCommand & "SELECT qTakeTestsAvailableTest.* "
        strCommand = strCommand & "FROM TestScores RIGHT JOIN qTakeTestsAvailableTest ON (TestScores.UserName = qTakeTestsAvailableTest.UserName) AND (TestScores.TestID = qTakeTestsAvailableTest.TestID)"
        DoCmd.RunSQL strCommand
        
        
    End If
    
    Me.Filter = ""
    Me.FilterOn = True
    cmdTakeTest.Visible = True
    cmdViewPresentation.Visible = True
    
    Me.Requery
    
End Sub
                                              
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by: phileocaPosted on 2009-10-05 at 13:43:51ID: 31636635

i solved it myself but don't want to wait 4 days for it to get closed.

20120131-EE-VQP-002

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