即便已經設定了utf-8字符集

DROP DATABASE IF EXISTS `db_lab2`;
CREATE DATABASE `db_lab2` DEFAULT CHARACTER SET utf8;
USE `db_lab2`;

CREATE TABLE `tb_student`(
	`pk_sno` INT(10) UNSIGNED AUTO_INCREMENT COMMENT '學號',
	`sname` VARCHAR(20) NOT NULL COMMENT '姓名',
	`ssex` VARCHAR(4) COMMENT '性別',
	`sage` SMALLINT
 
 UNSIGNED COMMENT '年齡',
	`sdept` VARCHAR(10) NOT NULL COMMENT '系別',
	PRIMARY KEY (`pk_sno`),
	CONSTRAINT chk_sex CHECK (`ssex` = '男' OR `ssex` = '女')
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `tb_course`(
	`pk_cno` SMALLINT UNSIGNED AUTO_INCREMENT COMMENT '課程號',
	`cname` VARCHAR(20) UNIQUE COMMENT
 
 '課程名',
	`cpno` SMALLINT UNSIGNED COMMENT '先行課',
	PRIMARY KEY (`pk_cno`)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `tb_sc`(
	`pk_sno` INT(10) UNSIGNED AUTO_INCREMENT COMMENT '學號',
	`cno` SMALLINT UNSIGNED COMMENT '課程號',
	`grade` SMALLINT UNSIGNED COMMENT '成績',
	PRIMARY KEY (`pk_sno`),
	FOREIGN
 
 KEY (`pk_sno`) REFERENCES `tb_student`(`pk_sno`),
	FOREIGN KEY (`cno`) REFERENCES `tb_course`(`pk_cno`)
)  ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `tb_student` VALUES(1, "小米", "男", 20, "計算機系");

而且MySQL的預設編碼也是utf-8 （可以如下命令檢視字符集）

SHOW VARIABLES LIKE '%char%';

即便所有都設定好了，但是source lab2.sql （上面的sql程式碼），依舊顯示下面這句中文錯誤。

INSERT INTO `tb_student` VALUES(1, "小米", "男", 20, "計算機系");

但是複製這句到mysql>下執行是不會報錯的
這也說明了字符集沒有錯，是記事本的錯
把這些程式碼換個編輯器也不會報錯，比如Visual Code

附：關於Windows記事本編碼的那些事