I am unable to add comments to my new installation of Drupal 7, instead I receive the message in the subject. The entire error message read thusly:
PDOException: SQLSTATE[HY000]: General error: 1364 Field 'comment' doesn't have a default value: INSERT INTO {comment} (pid, nid, uid, subject, hostname, created, changed, status, thread, name, mail, homepage, language) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11, :db_insert_placeholder_12); Array ( [:db_insert_placeholder_0] => 0 [:db_insert_placeholder_1] => 54 [:db_insert_placeholder_2] => 1 [:db_insert_placeholder_3] => test [:db_insert_placeholder_4] => 65.190.203.20 [:db_insert_placeholder_5] => 1322427327 [:db_insert_placeholder_6] => 1322427326 [:db_insert_placeholder_7] => 1 [:db_insert_placeholder_8] => 01/ [:db_insert_placeholder_9] => dev700 [:db_insert_placeholder_10] => [:db_insert_placeholder_11] => [:db_insert_placeholder_12] => und ) in drupal_write_record() (line 6884 of .../includes/common.inc).
I went into the DB and attempted to create a default value for comment, and received the following error: