database index problem , there are two aid index , help pls

[mywedding]

hi everybody ,

when i was check database tables , i saw a problem "picture" table , there are two same aid , what will i do for that , which i should delete , i didnt decide , can you help me.,
(https://coppermine-gallery.com/forum/proxy.php?request=http%3A%2F%2Fi17.tinypic.com%2F6bxy0bl.jpg&hash=aae652e638c3b7753d8f65b2375fb0f9a52877ea)

[Nibbler]

You can remove pic_aid if you want.

[mywedding]

many thx ,