MS Access and Null values
Hi,
I'm attempting to create a report in Crystal Reports Designer 2008 using a Microsoft Access 2003 table as a source. I'm having difficulty with my report design when the first record of the table contains a NULL value. I wish to find the Maximum() value of this field using the formula Maximum({table.field1}, {table.field2}) where field1 contains the value i'm trying to find the maximum of and field2 contains the grouping data. I find that if field1 contains valid values then the formula works as expected whereas if the first field1 value is NULL then the formula simply refuses to output anything (not even an error).
I attempted to amend my formula to read:
If IsNull({table.field1})
Or {table.field1} = ""
Or {table.field1} = " " Then
"1"
Else
Maximum({table.field1}, {table.field2})
But this also refuses to work.
I also tried the following from the menu File > Report Options ... > Convert Database NULL Values to Default, and the other setting of Convert Other NULL Values to Default, but neither seemed to work for me.
Any ideas on how I can test the table to see if the value is a null and hence deal with it?
Thanks,
Mike
Ian,
I had previously tried that with no luck.
I've investigated further and I think the problem actually lies elsewhere. In my report design I join a couple of SQL Server views to the MS Access table. I think the join conditions are such that there is no data to bring back and so although the {table.field1} contains a vaule it is being ignored since the other tables can't join to it.
I've managed to alter my other views and the problem still seems to have gone for the moment.
I guess to answer my own question, the use of ISNULL(), = "" or = " " are the correct tests for a MS Access table and probably for most other data sources as well.
Thanks,
Mike
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Hi,
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Thanx11g.DBA wrote:
Hi,
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Edited by: Enyix on 26/02/2012 11:21 PM
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Post Author: Kathleen
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The purpose of the attamy is to pull up any client that was served in a time range. So we have been using the Intake "{CLIENT.InDateStart}" and the {CLIENT.InDateEnd} as agency open and close dates. So for instance I want to know this for 1/1/07 - 12/31/07, the open date could be anything and the close could be blank or between those date.
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Can you post your SQL statement?
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