sql - Mysql query issue with left join -

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I have two tables and try to join them both on the basis of primary and foreign keys. But the problem is that in the second table there are duplicate lines in the foreign key.

1 table - category 

  catid catname 1aa2bbb3ccc   
 2 table - answer  
  ansid catid 1 1 2 1 3 2 4 2   
 should be the result  
  catid catname Currently answer table 1 aaa yes 2bbb Yes 3 ccc no   
 My query  
  Skip to select category * category.catid = answers.catid Join Answer at   < Select / div> 
 text "> 
  c.cidid, c.catname, in the case when the amount (a.catid is not empty)> gt and then 'no' and 'yes' As current_ As N_shansrs_tag a north Leave the Class C c.catid = a.catid group c.catid, c.catname

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