创建一个表
CREATE TABLE teacher (
– Id int PRIMARY KEY auto_increment,
– Name Varchar(50) not NULL,
– Age Int not NULL,
– Gender Char(2) DEFAULT NULL,
– Height Decimal(6,2) DEFAULT NULL
courseId int DEFAULT NULL
);
– 6、对教师表的王三笠名字修改为欧阳修,年龄改为40;
UPDATE teacher SET Name
=CONCAT(‘欧阳修’), Age=CONCAT(’40’) WHERE Name
=’王三笠’ AND Age=’28’
– 7、对课程表的”HTML网页设计”删除;
– INSERT INTO course VALUES(NULL,’HTML网页设计’); 插入数据
DELETE FROM course WHERE courseName=’HTML网页设计’;
– 8、对教师的身高从高到低排序。
SELECT * FROM teacher ORDER BY height desc;
– 9、从教师表中,找出三个年龄最小的教师出来;
SELECT Name
姓名, Age 年龄 FROM teacher WHERE Age
Original: https://blog.csdn.net/m0_63911352/article/details/124485159
Author: 新人码玩家
Title: mysql的巧用
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