Thread:Project:Support desk/Database error after updating to 1.20.4/reply (7)

I solved it by adding these two columns as shown below:

ALTER TABLE `your_database_name`.`wiki_recentchanges` ADD COLUMN `rc_moved_to_ns` TINYINT(3) UNSIGNED NOT NULL DEFAULT '0' AFTER `rc_type`, ADD COLUMN `rc_moved_to_title` VARBINARY(255) NOT NULL DEFAULT ''  AFTER `rc_moved_to_ns` ;

So my problem was that I first upgraded to 1.21, from 1.19, and then had to downgrade to 1.20.