如果找不到匹配项，如何在列中显示0？

Question

I'm doing a left join on two tables. Table one shows potential users while the other table shows actual users. Potential user is someone in a location who could potentially use our application. Actual user is someone in a location who has in fact used our application.

So I want three columns reported. Location, Actual Users, Potential Users

Now, I want to always show the potential user number -- even when actual users is 0, too. This is no problem. Potential users will show 0 in the field (its 0 in the source table).

But if actual user is 0, its displaying blank. How can I display this as 0 in Access?

Potential Users Table 

Location   | Potential    
-----------+---------  
New Jersey | 4  
Ohio       | 2

Actual Users Table  

Location   | Actual  
-----------+---------  
Ohio       | 1

Right now, if I do a left join. It'll show:

Location   | Potential | Actual 
-----------+-----------+------- 
New Jersey | 4         |   
Ohio       | 2         | 1

What I'd like to do is for New Jersey to show a 0 in the Actual column. Any ideas?

Answer 1

Try:

Nz(Actual, 0) AS Actual

Other option removed

Answer 2

尝试如下使用

 COALESCE(Actual, 0)