1 CREATE TABLE `node`.`user` ( `id` INT NOT NULL , `username` INT NOT NULL , `pass` INT NOT NULL ) ENGINE = InnoDB;

1              数据库名.表名            键                               值
2 INSERT INTO `node`.``user` (`id`, `username`, `pass`) VALUES (‘1‘, ‘wulv‘, ‘123‘);
3 //注意value的括号是单引号不是下飘键

1       删user表         因为id是唯一的   id = 0
2 DELETE FROM `user` WHERE `user`.``id` = 0
3 或：DELETE FROM `user` WHERE `user`.``username` = ‘李四‘; //当值为非数值的时候需要‘‘单引号括起来。

1 UPDATE  `node`.`user` SET  `username` =  ‘威斯布鲁克‘ WHERE  `user`.`id` =3 ;

1 SELECT * FROM `user` where `id` = 3; //查询user这个表里的所有内容