数据库错误1064：You have an error in your SQL syntax

MySQL版本5.5.25

创建数据库表的代码：
DROP TABLE IF EXISTS nb_article;
CREATE TABLE nb_article (
id bigint(20) NOT NULL,
appreciable tinyint(1) NOT NULL DEFAULT 0,
approve_cnt int(11) NOT NULL,
author_id bigint(20) DEFAULT NULL,
cate_id bigint(20) NOT NULL,
commented tinyint(1) NOT NULL DEFAULT 0,
content mediumtext CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
cover varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
draft tinyint(1) NOT NULL DEFAULT 1,
md_content mediumtext CHARACTER SET utf8 COLLATE utf8_general_ci,
modify datetime(6) DEFAULT NULL,
post datetime(6) NOT NULL,
summary varchar(300) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
text_content mediumtext CHARACTER SET utf8 COLLATE utf8_general_ci,
title varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
top int(11) DEFAULT NULL,
url_seq varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
view int(11) NOT NULL,
cate_refer_id bigint(20) DEFAULT NULL,
PRIMARY KEY (id) USING BTREE,
INDEX FKm9lpoad6mhygm6ybseq2kkg30(cate_refer_id) USING BTREE,
CONSTRAINT FKm9lpoad6mhygm6ybseq2kkg30 FOREIGN KEY (cate_refer_id) REFERENCES nb_cate (id) ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

运行时的错误：
[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(6) DEFAULT NULL,
post datetime(6) NOT NULL,
summary varchar(300) CHAR' at line 12

datetime 类型不需要制定数据大小，把大小去掉就可以了

modify 是关键字，不能直接当字段名，你改一下，比如
modifyDatetime