sql创建表时候单引号不是单引号是，而是Esc下面的按键

CREATE TABLE `test`.`testmd5` (
`id` INT ( 4 ) NOT NULL,
`name` VARCHAR ( 20 ) NOT NULL,
`pwd` VARCHAR ( 50 ) NOT NULL,
PRIMARY KEY ( `id` ) 
) ENGINE = INNODB DEFAULT CHARSET = utf8;

CREATE TABLE 'test'.'testmd5'(
'id' INT(4) NOT NULL, 
'name' VARCHAR(20) NOT NULL,
'pwd' VARCHAR(50) NOT NULL,
PRIMARY KEY('id')
)ENGINE=INNODB DEFAULT CHARSET=utf8;