mysql 处理中文乱码问题

CREATE TABLE tbl_score(
    `ID`      INT         NOT NULL,
    `score`   DEC(6,2)    NOT NULL,
    `subject` VARCHAR(20) NOT NULL
);

INSERT INTO tbl_score (ID, score, `subject`) VALUES (1, 90, '语文');
INSERT INTO tbl_score (ID, score, `subject`) VALUES (1, 80, '数学');
INSERT INTO tbl_score (ID, score, `subject`) VALUES (2, 86, '数学');
INSERT INTO tbl_score (ID, score, `subject`) VALUES (2, 96, '语文');

SHOW VARIABLES LIKE 'char%'; 
SHOW FULL COLUMNS FROM tbl_score;
 
ALTER TABLE tbl_score CONVERT TO CHARACTER SET 'gbk';