how to save columns in a grid

Question

hi

        how to save 'expencename','expence amount','income name','income amount' in a grid.these are in databse with seperate tables.i have to use select query but there is no common fields for both tables..how should i?but month and year must pass  as parameter...(1)first i need to select from expense and income tables,already running with different fields(2)then i have to save all columns(means four)using dimensional array.