How to display blanks in Crystal Reports? (when there is / are no data)

Question

1. I have a date field Table1.Dates with the dates of the whole month of September:
2. I have a field Table2.Sales with sales data in SOME dates in September
3. I have a field Table3.Expenses with the expenses data in SOME dates in September.

Question -- :

How do I display a blank (or maybe "$0.00") where there are no data of sales / expenses in that day?

DATE ~ SALES ~ EXPENSES
-----------------------

 09/01/2014 ~ **$0.00** . . ~ $500.00

 09/02/2014 ~ $320.00  ~ **$0.00**

 09/03/2014 ~ **$0.00**  . . ~ **$0.00**

...

 09/30/2014 ~ $50.00 ~ $24.00

I have tried --:

Querying them to join their dates but instead of displaying a blank where there is no datum, it displays the next datum where it exists regardless of grouping them by Table1.Dates .

Any help regarding this? I'll try more ways and do further Googling.

~ UPDATE ~ (from the first solution provided)

The picture above is the actual results of precisely following the first solution's suggestion. It is the actual fields and data of Table1 .

Although it does show the $0.00, the dates from Table1.Dates need yet to be displayed regardless of what data are in Table2 & Table3.

Answer 1

you can doe something like below:

1. First instead of inner join on Table1.Dates use Outer Join ... since this table has all dates for the September month.

2. Group the report using Table1.Dates .

3. For Sales and Expences write below formula:

    if Table1.Dates=Table2.Dates //Assuming Table two also consists of Date field Then "$"+ToText(Sales) else "$"+ToText(0) 

repeat same formula for Expences.

Let me know how it goes