qq名字网reply的用法
sql语言关于a left join on的问题
- FROM BLOGREPLY a left join BLOGInfo b on a.FORUMSN=b.BLOGSN left join MEMBERInfo m on m.MEMBERSN=a.MEMBERSN这句话是什么意思?问题补充： "select " + top + " isnull(d.allcount,0) as ReplyCount,m.TITLE as BlogTitle,b.TITLE as ClassTitle,a.BLOGSN,a.MEMBERSN,a.CLASSSN,a.TITLE,a.AUTHOR,a.IMGURL,a.CONTENTS,a.CLICKS,a.ADDTIME "还有这句也弄不明白~
- 建议你上网查查 left join ,right join ,inner join 的用法
数据库中KEY的用法
- 下面这段代码的最后，有一句【KEY `topicid` (`topic_id`)】代表什么意思？它和primary key、foreign key、unique key有什么区别？ CREATE TABLE `posts` (`id` int(11) NOT NULL auto_increment,`forumid` int(2) NOT NULL default 0,`groupid` int(1) default 0,`istopic` int(1) NOT NULL default 0,`topic_id` int(8) NOT NULL default 0,`title` varchar(100) default NULL,`content` text,`author` varchar(20) NOT NULL default ,`author_id` int(8) NOT NULL default 0,`click_times` int(7) default 0,`reply_times` int(5) default 0,`post_ip` varchar(16) default NULL,`post_time` datetime default 0000-00-00 00:00:00,`last_postor` varchar(20) default NULL,`last_time` datetime default NULL,`istop` int(3) NOT NULL default 0,`islock` int(1) NOT NULL default 0,`isdel` int(1) default 0,PRIMARY KEY (`id`),KEY `topicid` (`topic_id`)) ENGINE=MyISAM DEFAULT CHARSET=gbk;
- 添加的topicid是索引
英语翻译， whats that to your right? whos the boy to the left of Susan. 介词 to 什么用法？
- 英语翻译， whats that to your right? whos the boy to the left of Susan. 介词 to 什么用法？
- whats that to your right? whos the boy to the left of Susan.？那是什么对你的权利？苏珊左边的那个男孩是谁？一：表示相对，针对 be strange (common, new, familiar, peculiar, distinct, sensitive, immune, vulnerable, indispensable) to Air is indispensable to life. Aircrafts are vulnerable to interference caused by radiation. This injection will make you immune to infection 二：表示对比，比较 1：以-ior结尾的形容词，后接介词to表示比较，如：superior ,inferior,prior,senior,junior The quarrel happened prior to my arrival. 2:一些本身就含有比较或比拟意思的形容词，如equal，similar，equivalent，analogous A is similar to B in many ways. 3：表示一些先后顺序的形容词，如：second,subsequent,next,preliminary,preparatory Subsequent to the war,they returned to their hometown. 4:to也偶尔出现在个别动词之后,与动词形成固定词组,表示比较,如:prefer to,compare to,in contrast to compare to sth.表示比喻或比拟,而compare with sth.表示比较,如: World is usually compared to a stage Compared with his past,he has changed a lot. Prefer的正确句型是:prefer A to B或prefer doing A to doing B,但当prefer后接动词不定式时,表示比较的介词to就要改成rather than ,如: The undaunted soldier preferred death to surrender. Many people prefer spending money to earning money. They prefer to pursue careers rather than remain home as house wives. 5:to与及个别的名词构成比较之意,如:alternative Going to an under water concert is a great alternative to going to dinner. 三:表示修饰关系 1:表示回复,反应意思的词,如:answer to question, solution to problem,response to inquiry,reaction to proposal,reply to letter 2:表示建筑构件的词汇,如: entry,entrance,approach,access,passage,exit,vent,path the approac……余下全文
