09月22日, 2014 102次
要基本代码SQL(Structured query language,结构化查询语言) 建表：create table 表名(字段名 类型 ) 主键设置：not null primary key 修改表三操作： 删除：alter table 表名 drop 字段名 增加：alter table 表名 add 字段名 数据类型 修改：alter table 表名 alter 字段名 数据类型 --命令能修改字段类型修改名称 修改数据三操作： 添加记录：insert into 表名 【（字段名）】values (数据) 【】缺省选择输入 修改数据：update 表名 set 字段名=表达式 【where 条件】 删除数据：delete 字段名列表 from 表名 【where条件】 其余命令： 删除整张表命令：drop table 表名 联合查询：(select ……) unino (select ……) 查询：select * from (select ……) as 1,(select …… ) as 2 数据查询命令： select 字段表达式/*/all/distinct(翻译：掉重复项)/top(选择显示部明确数字或者百比) from 数据源 where/group by(按照某字段组) ……【having】(处组同设置条件)/order by (排序两值Asc 升序DEsc降序
你好，你可以下载百度翻译APP，里面可以请专家翻译或者写什么的 本回答由网友推荐
取，找英语翻译软件。
Dear Professor XXX,I am a student from (XXX course/school). I have heard about your name and your great work from my school teacher. I really appreciate what you have done for the academic field. Since I am doing a project/assignment related to XXX, I need lots of information about XXX to support my work. Could you please do me a favor? Actually, your academic essay/thesis ''XXXXX'' is a great reference for my project. Could you please send it to me since I could not find it on the internet? Your work would be highly appreciated since this project will be introduce to different high schools in my country.I look forward to receiving your reply.Thank you so much!Best regards,XXXXX***留意,XXX的地方请根据自己的情况填写,内容也可修改~因为我不清楚你的状况和要论文来做什麼......(发电邮只要有礼,用词符合身份就OK) 本回答由提问者推荐
I admire your workI respect your work我对你的工作表示敬意｛世界通用｝you've got a great personality你的个性很好｛一个非常安全的表扬｝you have a good sence of humor你真幽默｛美国人极其喜欢的表扬｝your chinese is really surprising你的中文令人惊讶｛绝对和其他人不同的表扬｝you have a very successful business你的事业很成功｛现代人非常喜欢听｝you're very professional你非常专业｛专业化的表扬｝you're so smart你非常聪明I envy you very much我非常羡慕你结尾语常用套语 Please write back soon．（请速回信。） Please give my love to your family．（请代我问候你的全家。） I hope to hear from you soon．（我希望不久收到你的信。） May God bless you and your family！With every good wish for your happiness．（愿上帝保佑你及你的家人。祝你幸福。） Best regards．（敬意。） Good luck to you！（祝您好运！） We are all looking for your next visit to China．（我们都盼您下次来访问中国。） Wish（Wishing）you every success in your future career！（祝你成功！） All my best wishes for the future！（祝你一切顺利！） Wish you the best of health and success！（祝您身体健康，工作顺利。） Expecting to hear from you as soon as possible．（盼早日回信。） Thank you for an early answer．（请尽早答复，不胜感激。） Meanwhile，we wish you good health and every success in your work．（祝身体健康，工作顺利！） All my best wishes for the future！（祝您一切顺利！）书信结尾客套语有多种，相当于我国书信在结尾时使用的"敬礼"、"致敬"、"顺安"等句。最为典型的美国式写法是Sincerely和Best regards，典型的英国式表达有Yours sincerely（熟人或知道对方姓名），Best wishes, kind regards 和yours faithfully（不知姓名）。此外，英国式的客套语还有特别礼貌的格式，但除了特殊情况外，现在不再使用.还有: Best wishes! Wish you a Merry Christmas and a happy New Year!(快过圣诞时用） May you succeed! 参考资料： 借花献佛啦
Dear friend, Welcome to China! I' m so glad to have a communicate with you. I hope that we can be really good friends! At first, I want to tell you something about me. My name is Li Hua. I study in the Middle School. I have a happy family. My father is a cooker, he usually cooks some food for me.Oh! That is quite a few dilicious. My mother is a teacher,so I always get good grades.Thanks to my parents,they make me confident all the time. Join us,we won't let you down. I'm good at English. English is my favorite subject. I always see the English movies and listen to the English songs. Have you heard of the star Maria Carey? I'm her fans! I like her songs very much! As you know, China is a pretty friendly country. If you live in my house, I will visit The Great Wall and eat the Peking Duck with you. Trust me, it will be a fantastic travel for you! Wish you have a great time!Yous,Li Hua 本回答被网友采纳