I've the following two tables: 

```
  Table: ProductList
  Product;
   Product a
   Procuct b 
   Product c
   ...
   Product Z

Table: SalesTable
Agent, Product, Qty
 ZXY, Product A, 200
 ABC, Product A, 100
 ABC, Product B, 200

```

I would like to have a table with ALL product List \* Agent list. 
So, for instnace : 

```
   Agent, Product, Qty
   ZXY, Product A, 200
   ZXY, Product B,  -
   ZXY, Product C,  - 
   ....
   ABC, Product A, 100
   ABC, Product B, 200
   ABC, Product C, -
   ABC, Product D, - 

```

Using : 

```
SELECT * 
  FROM ProductTable
       LEFT JOIN AgentTable 
            ON ProductTable.Product = SalesTable.Product

```

not work, obviously.