Correction erreurs base de données PHP/MYSQL

Bonjour,

J'ai quelques erreurs que j'aimerai faire corriger sur mon site et sa bdd.
J y accède par phpmyadmin.

- "General error: 1364 filed doesn't have a default value doesn't have a default value. The SQL statement executed was: INSERT INTO ..."

- [error] [system.db.CDbCommand] CDbCommand::fetchColumn() failed: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '%' )' at line 1. The SQL statement executed was...

- De plus par moment j'ai cette erreur :
[error] [exception.CDbException] exception 'CDbException' with message 'CDbConnection failed to open the DB connection: SQLSTATE[42000] [1203] User
already has more than 'max_user_connections' active et impossible d'augmenter le max_user_connections car je suis sur un hébergement mutualisé.