Find Previous Record field data, or better suggestion

Anonymous
2020-01-13T19:45:54+00:00

I am trying to find the previous record value/field in a query to apply conditional formatting to my form. I have been researching using LAG function, but just can't make it work for what I need or am just not doing it right. 

What I have is a form that lists(and more): 

SERIES - TITLE

Series1 - Title1

Series1 - Title2

Series2 - Title3

Series3 - Title4

Series3 - Title5

Series3 - Title6

and I want to add a conditional format to hide the series values that repeat from the record above to show: 

SERIES - TITLE

Series1 - Title1

            - Title2

Series2 - Title3

Series3 - Title4

            - Title5

            - Title6

I tried to use the LAG Function, but dont think i'm adding it correctly.

Then i also found the below code but that just returns #NAME in the field. 

Function PrevRecVal(F As Form, Keyname As String, KeyValue, FieldNameToGet As

String)

End Function

    Dim RS As Recordset

On Error GoTo Err_PreRecVal

    'The default value is zero

    PrevRecVal = 0

    'Get the form recordset.

    Set RS = F.RecordsetClone

    'Find the current record.

    Select Case RS.Fields(ID).Type

        'Find using numeric data type key value?

        Case DB_INTEGER, DB_LONG, DB_CURRENCY, DB_SINGLE, DB_DOUBLE, DB_BYTE

            RS.FindFirst "[" & KeyName & "]=" & KeyValue

        'Find using date data type key value?

    Case DB_DATE

            RS.FindFirst "[" & KeyName & "]=#" & KeyValue & "#"

    Case DB_DATE

            RS.FindFirst "[" & KeyName & "]='" & KeyValue & "'"

    Case Else

            MsgBox "Error: Invalid key field data type!"

    End Select

        'Move to the previous record.

        RS.MovePrevious

        'Return the result

        PrevRecVal = RS(SeriesID)

Bye_PrevRecVal:

        Exit Function

Err_PrevRecVal:

        Resume Bye_PrevRecVal

        End Function

(in the control source of the field to show the previous record)

= PrevRecVal([Form],"SeriesID",[SeriesID],"SeriesID"

can anyone tell me 1)which one is better to use(above code or a lag function), 2)what im doing wrong or how to add a lag function if that is what i need here, 3)is there a better/easier solution you can suggest instead?Help! THANK YOU!

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Anonymous
2020-01-15T22:31:40+00:00

Let's confine it to one table to start with:

SELECT T1.SeriesID,

IIF(COUNT(*) = 1,T1.Title,"") AS Title,

IIF(COUNT(*) = 1,T1.SeriesPart,"") AS SeriesPart,

FROM TitleT AS T1 INNER JOIN TitleT AS T2

ON T2.SeriesID = T1.SeriesID

AND T2.Title <= T1.Title

GROUP BY T1.SeriesID, T1.Title, T1.SeriesPart

ORDER BY T1.SeriesID, T1.Title;

If that returns the correct result table then you can add the SeriesT table to the query and return the Series column rather than the SeriesID:

SELECT SeriesT.Series,

IIF(COUNT(*) = 1,T1.Title,"") AS Title,

IIF(COUNT(*) = 1,T1.SeriesPart,"") AS SeriesPart,

FROM SeriesT INNER JOIN (TitleT AS T1 INNER JOIN TitleT AS T2

ON T2.SeriesID = T1.SeriesID AND T2.Title <= T1.Title)

ON SeriesT.SeriesID = T1.SeriesID

GROUP BY SeriesT.Series, T1.Title, T1.SeriesPart

ORDER BY SeriesT.Series, T1.Title, T1.SeriesPart;

You can of course include the SeriesID and TitleID columns in the SELECT and GROUP BY clauses if you wish, but usually these would be surrogate keys with arbitrary values of no semantic significance.

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  1. Anonymous
    2020-01-17T21:02:51+00:00

    I need to add another grouping now that could be grouped by series (as you have shown) OR universe.

    A Boolean OR operation in a JOIN clause would be unusual.  A JOIN on multiple attributes is normally reductive, which would require a Boolean AND operation.  An OR operation, on the other hand, would be additive, returning the members of two sets which match on either of two or more criteria.

    I'm afraid I don't follow what you are attempting here.  It might help if you could provide an example of the result table you expect.

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  2. Anonymous
    2020-01-20T15:32:44+00:00

    Ok so theres 3 tables...

    T1 has: TID, Title, UID, UPart, SID, SPart(and more)

    U1 has: UID, Universe

    S1 has: SID, Series

    Each Title from T1 can have a UID and/or a SID. I want the query list to show fields UniverseGroup and Title, where UniverseGroup: IIf(IsNull([Universe]),[Series],[Universe]) and grouped by UniverseGroup. 

    So like the other group it only shows the first listing of that group, and only titles with either Universe or Series are listed.

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  3. Anonymous
    2020-01-20T23:34:03+00:00

    You might be able to do that by replicating the earlier query I gave you, but with Universe rather than Series as the referenced table.  Then return a UNION of the two queries in a final result table.  Beyond that I can't be any more categorical.

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  4. Anonymous
    2020-01-21T00:32:12+00:00

    hi Moses, as Ken suggested, can you provide a screen shot of the expected result?

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