文字如下:
摘 要:目前,几乎所有的应用程序都要和数据库打交道。通过查询数据库可很容易地获得想要的数据。但是,令人不满意的是:某些查询时间长,响应速度慢。究其原因,一是硬件设备(如CPU、磁盘)的存取速度跟不上,内存容量不够大,这需要计算机制造商的努力;另一方面是没有进行查询优化。一个成熟的管理信息系统必需建立在一个好的数据库基础之上,由于用户对数据库的查询效率提出很高的要求,因此必须对数据库的查询进行优化.通过介绍有关数据库查询优化技术,从几个方面来具体阐述SQL优化查询的实现方法。
关键词: 关系操作; 查询优化;SQL语句; 优化技术; 数据库;
一小段英语短文的翻译---高手帮忙
1 it all fell apart: 这个梦支离破碎。 it,指前文提到的american dream。all里面包含了好多个内容,这个不受单复数限制。 eg It all up to you.2 我曾经坚信美国梦,这个梦意味着一份工作,一份按揭贷款,信用卡和成功。我和其他人一样,追求着这个梦并为之奋斗。我们都以不同的方式追逐这...
请英语高手帮忙翻译以下文字,谢谢!希望用语比较纯正!(急用)采纳后再追...
we will work over time and send "catalog" to you in 5th Feb(Beijing)PM \/5th Feb (Swiss) AM by e-mail,we are sorry about that 希望我们能给你更多的帮助,谢谢!wish we can give you more help, thanks a lot!附:我们公司的介绍。PS:the introduction of our company ...
一小段英语短文的翻译---高手帮忙---在线等
(2)【It’s not just that we’re going to where the animals are;】 we’re also bringing them closer to us. Popular foreign pets have brought a whole new disease to this country.翻译:不仅是我们去了动物所在地方,而且是我们也和它们有过亲密的接触,受大众欢迎的国外的宠...
请英语高手帮我翻译一段话 要人工翻译!!谢谢
Sincerely,Sunny
请英语高手帮我翻译一段话,谢谢(汉译英)
1.You can take a plane from Chengdu to Wuhan, and there you can take a coach or train to Xinyang.2. You can come from Nanjing straight to Xinyang by train. And also, you can first reach Wuhan by air from Nanjing, and then come to Xinyang by coach or train. Please ...
请英语高手进来帮我翻译一段文字~~
Concerning the death, the mankind always fear.But does kinglet's son say:You have no necessity for the sake of old hull but grief.Why say this to is it 1 that make a person sad nursery tale?Not only is because of this only at the end of the nursery tale, kinglet's ...
请英语高手帮我翻译一段邮件,谢谢(英译汉)
Durban for cheaper. 我有个经纪人在莫桑比克,他可以报价这些黑白尺寸及加成本,保险,运费到班得价格更低。Can you give a better deal if I order more containers and pay 25% to initiate the order and the remaining after a company i pay in china checks the order and confirms my order...
英语高手帮忙翻译几个句子吧 急用 谢谢
下面是意译:1. I enjoy chatting with people who are out-going. It's much more pleasant. It's more constraining talking with stuck-up people.2. I have never been absent, except when I was so sick I needed to stay home or go to a clinic.3. I am engrossed when the ...
请英语高手帮忙翻译一段文字
students' information consumption by adopting the combinations of canonical parse and empirical analysis with the questionnaire survey from the Yunnan University students.And in collection with these problems,the paper put forward some related advice and contermeasures.希望能帮上你!!!
急!!! 请英语高手帮忙翻译一下!!! 谢谢啦!!!
If the price is reasonable, I want to buy small amount first to make sure the item is a right one as what we want and then I will order with the amountas I mentioned above.我希望你能出个好价钱,如果这个价钱合理,我想先订购一小部分,来确认它是不是符合我们的要求。如果符合...