Nested query value used as comparison in second nested query

Hi,
What would be the best way of writing the following:
I have a simple SELECT statement which includes two nested queries used to get the start and end dates from two different tables (if the first date from the first table and the second from a different table), there is not real direct relationship between
those two seperate tables. However the result of the first date nested select would determine part of the WHERE statement in the second nested statement.
I need a way of using the value returned as a part of first nested select in the where statement of the second.
I know exactly how to do this using something like ASP.NET C# but that involved running them as seperate queries and storing the values in variables before running a new statement for example and I would prefer to run a single query with the nested selects
and get the results as required.
Can anyone point me in the right direction of the best way of running this kind of thing?
Cheers for any replies!

Hello,
Please provide DML for the tables, some sample data and the expected result. Just with your description we could only guess.
Olaf Helper
[ Blog] [ Xing] [ MVP]

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Function GetLastRefreshed() As Variant
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On Error GoTo GetLastRefreshed_Error
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    Dim TextCellAddr$
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    LastRefreshedVal = "NOT FOUND"
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        Err.Raise vbObjectError + 513, , "sapbexDebugPrint failed to create the diagnostic workbook"
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    ' error handling to deal with this instead)
    ' Find the first cell in the "E_T_TXT_SYMBOLS" worksheet
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    ' (If the worksheet doesn't exist, an error will be thrown...)
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    If TextCell Is Nothing Then
        ' Can't find the cell, so we know the user had canceled during previous refresh
        LastRefreshedVal = "NOT FOUND"
    Else
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        TextCellAddr$ = TextCell.Address ' $F$11
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GetLastRefreshed_Exit:
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GetLastRefreshed_Error:
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        Case 9 ' Subscript out of range (which means "E_T_TXT_SYMBOLS" worksheet doesn't exist)
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why would it be duplicated? its a sequence and its unique.. I dont know, maybe there is something wrong my script..
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Ed,
1. What is the current value of the Sequence? Does the current value of sequence exist in the table? If yes, then increment the sequence to a value that is not present in the Table.
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Nested query value used as comparison in second nested query

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