Crie a tabela em MySQL Mariadb Primary Key Foreign Key
CREATE TABLE IF NOT EXISTS `scores` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
UserId int(11) NOT NULL,
`NICKNAME` varchar(50) NOT NULL,
`HIGHSCORE` int(11) NOT NULL,
PRIMARY KEY (`ID`),
FOREIGN KEY (UserId) REFERENCES USER(Id)
);
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