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    Table :- test
category_id   | category_name          | main_category | 
...
|          11 | Five                   |             0 | 
|          12 | Ten                    |            10 | 
|          13 | Eleven                 |             5 |
  2. or download this
    One    
  Six
...
Three
Four 
Five
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     Query 1 :- Select category_id from test where main_category='0';
 Query 2 :- Select category_id from test where main_category=(result f
+rom query 1)