When you do a Table Structure/Data copy command, the information under extra's isnt copied ( Auto_Incriment, etc )
Example:
Column Information For – wolven_AoStuff.BugAttachments
Field Type Null Key Default Extra
AttachmentID bigint(20) MUL (NULL) auto_increment
BugID bigint(20) 0
Filename varchar(255)
ctype_primary varchar(255)
ctype_secondary varchar(255)
Body longblob
^^ before copy
Field Type Null Key Default Extra
AttachmentID bigint(20) MUL
BugID bigint(20) 0
Filename varchar(255)
ctype_primary varchar(255)
ctype_secondary varchar(255)
Body longblob
^^ After copy