sql - How to get a name of a foreign id -

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I'm trying to get the name of my sub-id

my table looks like this Is 

  id Sub_id | Title 1 0 | Home 2 | 0 | About 3 | 2 | About sub 4 3 | Third sub   
 So I will need the title of sub-id2 which will be about about so far I am only able to get the ID and not the title  < P> This selection statement is $ id current page, which I am about, which will be about sub.   Choose sub-id from the  menu where id = '. $ Id. '    
 
 
 An auto-insert: join the same table twice  
  select t1. *, Your2table t1 to t2.title t1.sub_id = t2.id     is included in your_table t2

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