It is difficult to understand what you are trying to do.  What is the
real-world situation behind your efforts?  Are both queries based on the
same table?  You can add several tables to a query, but they won't work
together unless there is some sort of relationship between them (or if you
create a union query, as scubadiver asked about).  However, since for a
union query you need to write SQL directly (rather than creating it through
design view), you would probably know if you had created one.
If the queries are both from the same table, you may need to change the join
type to get the results you want.  In query design view, click the line that
links the two queries, then click View > Join Properties.  The descriptions
for the join types may guide you in the right direction.

I think I get what you mean. When you create the query do you show your two
queries and then drag a field from one query to the other to create a line?

The problem with doing this is that only records with information in each
query will be shown especially if the link you are using is the date! Ah ha?
So only those rows with a common date will show. That is why rows with no
dates are not showing.

FYI:

A union query joins queries together with common fields so you have rows
from all queries in one list. That may solve it for you. The idea for the SQL
is the following.

SELECT [field1], [field2]
From query1

UNION SELECT [field1], [field2]
From query2;

What you need to do is open a blank query. Close the "show table" box, go to
the top left hand corner and select "SQL". Then you will get a white screen
in which to paste the code.

Let me know...