1054 Unknown column 'c.parent_id' in 'on clause'

[darocket]

You are on the right path - try to remove the mods one at a time &/or if you have your own template and followed the override system switch to contempoary green(classic) and see if the issue persists

Well, I fixed it. The problem was that SEO module. Man, that thing gives me a hard time. I had it disabled for a long time since it gave me a problem a while back. But I guess disabling does not always fix future problems. So, I went in and deleted every file that it created. Now the problem is fixed...Thanks all though.

[darocket]

So now that I've deleted every file that I've found for SEO URLs, the menu item still appears in my Configuration menu in the Admin area. How do I go about removing old items??

[signs]

Thank you so much for posting about this issue AND how you fixed it. My web host pointed me to this thread after telling me they couldn't fix it for me, but removing the SEO url mod files fixed it good as new.

The mod never reallly worked for me (it's been installed for a few years now and inactivated due to not working right). Just out of curiosity I tried it out again last week and it still didn't work right so I turned it back off.

Everything was fine until I added a new product today. As soon as I clicked the button to add the product, I lost front and back end.

Anyhow, after reading this thread and carefully removing all files relating to the SEO URLs, I'm back in business. Thanks again!

[frank_lyy]

Well, I fixed it. The problem was that SEO module. Man, that thing gives me a hard time. I had it disabled for a long time since it gave me a problem a while back. But I guess disabling does not always fix future problems. So, I went in and deleted every file that it created. Now the problem is fixed...Thanks all though.

To all folks out there still having trouble with "1054 Unknown column 'c.parent_id' in 'on clause'", you should read all posts on this subject to get the customized solutions to individual problems.

For me, it was the SEO URL Mod. But, I found out that there is nothing wrong with this mod. The real culprit is Mysql data base queries. Once your host upgrade sql database to 5.x, you need to fix your sql queries in your catalog/admin files accordingly. I strongly recommend everyone to install "Developer Tool Kit" mod. I found solution to my problem through this mod. Here is fix to SEO URL queries for my store:

Locate file - public_html/includes/classes/seo.url.php
at around lin 910, Change the following code:

$sql = "SELECT c.categories_id as id, c.parent_id, cd.categories_name as cName, cd2.categories_name as pName
FROM ".TABLE_CATEGORIES." c,
".TABLE_CATEGORIES_DESCRIPTION." cd
LEFT JOIN ".TABLE_CATEGORIES_DESCRIPTION."

to :

$sql = "SELECT c.categories_id as id, c.parent_id, cd.categories_name as cName, cd2.categories_name as pName
FROM (".TABLE_CATEGORIES." c,
".TABLE_CATEGORIES_DESCRIPTION." cd)
LEFT JOIN ".TABLE_CATEGORIES_DESCRIPTION."

Problem solved! SEO URL mod is a cool mod, there is nothing wrong with using it.

[shqipo]

Thank you so much! That did it! I was pulling my hair trying to figure it out why suddenly, after 2+ years of working fine, my site broke down. Apparently my host upgraded their MySQL and didn't bother to tell anyone.

[sparrish]

THANK YOU!!! This extremely helpful explanation saved me a lot of headache.

[life]

great fixed my issue as well in two seconds

[ztotheetothen]

thank you so much for this post. i can't believe that my dedicated server company, Server Pronto, upgraded mysql without telling me and it broke my website completely.

wow, this is a third event that caused my site to go down, all instances responsibility of server pronto. They had "a failed cable" and also "HDD issues" , unbelievably bad server company. horrible, please nobody sign up for any services from server pronto! They have good prices, but bad service. BEWARE: http://www.serverpronto.com