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MySQL.  

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  (primary key)              .            .       PK (primary key).
   ,             .          .
 ,    Forum  themes  posts     :
 
   themes  id_theme,   posts - id_post.  ,   id_theme     posts.       posts    (          themes).      FK (foreign key).   .1,        themes,        themes  posts.  ,      ()  PK=1   posts      1,   ,        PK=1  themes.

   

       ()    ().
          ,     .             .
         ,   .         ,      . 

:

        ,    ,          .       ,            .
     auto_increment,     ,     .           , MySQL      ,            .

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