Find Previous Record field data, or better suggestion

Anonymous

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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Answer accepted by question author

Anonymous

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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Find Previous Record field data, or better suggestion

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