Is it possible to load data in 2 steps in jquery datatable?

Hi all
I use a jquery datatable with a sAjaxSource and want to load data in col 1, col 2, col 3, col 4 in first way because in my datasource I have a json from a sql query with an execution time around 1 minute. In the second way, I want to load data in col 5, col 6, col 7
I have to show data in the datatable as far as possible
I think of writing 2 queries for the 2 steps => 2 datasources, and load data in the datatable in 2 steps; is it possible and how? or what should I do?

Thanks!