mysql 处理中文乱码问题

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

INSERT INTO tbl_score (ID, score, `subject`) VALUES (, , '语文');
INSERT INTO tbl_score (ID, score, `subject`) VALUES (, , '数学');
INSERT INTO tbl_score (ID, score, `subject`) VALUES (, , '数学');
INSERT INTO tbl_score (ID, score, `subject`) VALUES (, , '语文');

SHOW VARIABLES LIKE 'char%';
SHOW FULL COLUMNS FROM tbl_score;

ALTER TABLE tbl_score CONVERT TO CHARACTER SET 'gbk';