Null values in my table are causing problems in my join query

What fields and I can rewrite it for you, unless you know how do this.

isnull(fieldname,' ')

In access, its actually Nz()

so if this line was giving you trouble:

 "AND Requests.Department = " & "'" & strDepartment & "'" & ")" & _

change it to this:

 "AND Nz(Requests.Department, '') = " & "'" & strDepartment & "'" & ")" & _

MS article on Nz:

http://office.microsoft.com/en-us/access-help/nz-function-HA001228890.aspx

Gallitin,
Thank you for the quick response.  The fields that are causing me problems are in BOLD below.  The Requests.RequestTypeID is a Numeric field in my table.  I'm not sure if that will cause problems using isnull or not.  I'm not so much concerned about that though as that field is rarely left null.  Let me know if you need more.  Thanks.

strQuery = "SELECT Requests.*, RequestTypes.RequestTypeID, RequestType, [Approved/Unapproved].ID, [Approved/Unapproved].[Approved/Unapproved], " & _
                    "[Type of Leave].ID , TypeOfLeave " & _
                    "FROM Requests, RequestTypes, [Approved/Unapproved], [Type of Leave] " & _
                    "WHERE ((Requests.StartDate Between #" & strStartDate & "#" & " And #" & strEndDate & "#" & _
                    "OR Requests.EndDate Between #" & strStartDate & "#" & " And #" & strEndDate & "#)" & _
                    "AND Requests.Department = " & "'" & strDepartment & "'" & ")" & _
                    "AND Requests.RequestTypeID = RequestTypes.RequestTypeID " & _
                    "AND CInt(Requests.[Approved/Unapproved]) = [Approved/Unapproved].ID " & _
                    "AND CInt(Requests.[Request Type]) = [Type of Leave].ID " & _
                    "ORDER BY RequestID"

"AND Nz(Requests.RequestTypeID, 0) = RequestTypes.RequestTypeID " & _
                    "AND Nz(CInt(Requests.[Approved/Unapproved]), 0) = [Approved/Unapproved].ID " & _
                    "AND Nz(CInt(Requests.[Request Type]), 0) = [Type of Leave].ID " & _

This is MS SQL

strQuery = "SELECT Requests.*, RequestTypes.RequestTypeID, RequestType, [Approved/Unapproved].ID, [Approved/Unapproved].[Approved/Unapproved], " & _
                    "[Type of Leave].ID , TypeOfLeave " & _
                    "FROM Requests, RequestTypes, [Approved/Unapproved], [Type of Leave] " & _
                    "WHERE ((Requests.StartDate Between #" & strStartDate & "#" & " And #" & strEndDate & "#" & _
                    "OR Requests.EndDate Between #" & strStartDate & "#" & " And #" & strEndDate & "#)" & _
                    "AND Requests.Department = " & "'" & strDepartment & "'" & ")" & _
                    "AND isnull(Requests.RequestTypeID,0) = RequestTypes.RequestTypeID " & _
                    "AND CInt(isnull(Requests.[Approved/Unapproved],0)) = [Approved/Unapproved].ID " & _
                    "AND CInt(isnull(Requests.[Request Type],0)) = [Type of Leave].ID " & _
                    "ORDER BY RequestID"

Select all Open in new window

Try to use the Nz function:

CInt(Nz(Requests.[Approved/Unapproved],0))  

CInt(Nz(Requests.[Request Type],0))

Also check out the data type of your fields for it is uncommon to use the Cint to a text field format.

Sincerely,
Ed

I copied and pasted Gallitan's code and while I'm not getting the error anymore, I'm not getting the record that I should be getting.  I'm going to keep testing....I'll get back to you.

..did you try mine?

i don't know why you completely ignored all my posts, considering i posted a correct solution twice...

Gallitin's code worked.  I was entering in the wrong values when testing..it's been a long day.  Anyway thanks to all of you.  I appreciate it.