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mysql ÖÐÓÐ ttt ±í½á¹¹ºÍÊý¾ÝÈçÏÂ

CREATE TABLE `ttt` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `num` double(15,3) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1;

INSERT INTO `ttt` (`id`, `num`) VALUES
  (1,8),
  (2,8.3);

ÔÚphpÖÐ, ²éѯ select * from ttt
ÏÂÃæÊÇ mysql_fetch_array µÄ½á¹û
Array
(
    [0] => Array
        (
            [id] => 1
            [num] => 8.000
        )

    [1] => Array
        (
            [id] => 2
            [num] => 8.300
        )

)

ÎÒÔÚemsÀï²éѯ£¬num ÏÔ³É³É 8 ºÍ 8.3, ΪʲôphpÀïÏÔʾ³ÉÕâÑù£¬Ôõô½â¾ö?(²»ÏëÓÃphp¶þ´Î´¦Àí)


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`num` double DEFAULT NULL
¾Í¿ÉÒÔÁË


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