sql - Oracle how to cast result of a select into a number as data for the next query? -

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Suppose: 

  select from where id = (select ID from B);   
 Where there is a column  a  in the  id  table, and there is a varchar column in the  id  table < Code> b .  
 How do I convert the result of  to B to  in a number?  
 It looks like this:  
  choose from where id = to_number ((Select ID from B));    
 
 
  choose from where id = (to_number (id)) select from );   
 BTW, if you have more than 1 or 0 rows in  b  then you  =  operator will be  IN

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