sql - SUM of attributes across different ables and JOIN -

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I am currently learning SQL and have the following problems.

Suppose I have two very large tables, 

  table one name CNT A1B2 table B. name CNT A2C5   
 Now I want to join two tables and add CNT. The name is same  
  Results Name CNT A3B2C5   
 Can anybody help to provide some hints on a good way to go? << P> 
 
  select NAME, from SUM (CNT) (select NAME, from CNT to TABLE_A UNION Select all names, CNT to TABLE_B ) TAB Group by NAME;

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