CF_EXCEL Query Problem

I have the following code below using the CF_EXCEL tag. This code works fine if only selecting from one table, but just goes on forever when I select from two tables as shown below. The datafields are exactly the same for both tables, and I have even tried referencing which table field is which (ex. table1.LastName,table1.FirstName, etc)
I get an error after a while from ColdFusion stating that an error has occured and nothing else. I am guessing it is a timeout error.
Anyone have any idea how can I make this work with multiple tables? Thanks.

<CF_EXCEL
Datasource = "datasource"
TableHeadings = "Last Name,First Name,Mailing Address,Mailing Address 2,Mailing City,Mailing State,Mailing Zip"
DataFields = "LastName,FirstName,MailingAddress,MailingAddress2,MailingCity,MailingState,MailingZip"
SQLCommand = "SELECT * FROM table1, table2">

Without a where clause you are selecting the cartesian product of everything in both tables. You'll want to get the SQL correct before you feed it into the custom tag.