To ensure that null values in the 'Profits' field are replaced with 0, you can use two functions: IFNULL([Profits], 0) and ZN([Profits]). The IFNULL function checks if the 'Profits' field is null; if it is, it assigns a value of 0. The ZN function does the same by replacing null values with 0. These functions will ensure that the dataset will display 0 for any null values in the 'Profits' column, as shown in the second table.