and now the value will be s.campaign = value1value2.
Now it is up to you that how you wanna capture the two variables. You can also use an delimiter to separate the values, but if one query string parameter is available, the results would be like 'value:' or ':value' (Assuming ':' as delimeter). So whenever there is no value in any of the query string parameter you can set the default value like 'Default', 'Not Available' etc., so that it will be easier during classification rule builder.
Sorry, i just wanna sum the earlier conversation. Ha ha!
Adding to the Thread which ishans52004352is referring just keep in mind that you will the multiple code in one line item separated by a delimiter, you can leverage classification once the data is collected.