oracle - SQL reduce duplicates in union clause -

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For example, I have the following questions: 

  select customers, from the country Select the country where the country = 'Germany' select the city from the suppliers, the country where the country = 'Germany' order by the city;   
 As you can see that  WHERE country = 'Germany'  is repeated in both goals of the union - without query to reduce the query Is there any way to repetitions? I do not like my questions very long. I  
 I am currently working on Oracle.   
 
 
 why not  WHERE  only once  
 < CODE> SELECT * (Select City, Select Country All Customers from Country, City by City Order by Country Order) Tab WHERE Country = 'Germany'   
 (or) Code> Join  as  
  Selection as customer C. Customer, c. Desh, as a customer. Area as Supplier, S. Supplier Country = s.ountry and c.ountry = 'Germany' order c.City;

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