mysql: error: #1062 - Duplicate entry '0' for key 1
http://blogs.vinuthomas.com/2008/06/18/mysql-error-1062-duplicate-entry-0-for-key-1/
info: it seems that Mysql throws this error because the field type of the auto increment field is not large enough to hold the next value, so it tries to wraps the count back to ‘0' where the is already a record with that value.
http://www.zen-cart.com/forum/showthread.php?p=488103
http://www.zen-cart.com/forum/showpost.php?p=215391&postcount=17
while export/import mysql db (while backing up a server)
moreinfo: it appears that the cause is related to the way in which various hosts will export backups of data to transfer from one server to another.
I'm guessing that many of them don't include the auto-increment property by default ...
Issue with Primary key
http://www.zen-cart.com/forum/showthread.php?p=488103
info: zen-cart specific: This table should not have a primary key.
And, since you've got one set, it's forcing uniqueness on every "0" record, which would happen for every "guest"/visitor.
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