Range Query

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&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp;1.find MongoDB uses Find to query. The query is to return a subset of the files in the set. The child collection ranges from 0 documents to the entire collection. The first parameter of find determines which documents to return. The form is also a document that describes the details to be queried. The empty query document {} matches the entire contents of the collection. If you don't specify ...

In the application of http://www.aliyun.com/zixun/aggregation/17799.html "> Development process, the most operation or data query operations, by virtue of the thinkphp of the consistent operation of the characteristics, Can make query operations more elegant and clear, however, the new naming range feature defines a series of query packages for model operations, making it easier for you to query the data. Define attributes to use the named range feature, mainly involving the _scope attribute of the Model class ...

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Research on fast query algorithm of mass data the Nanjing University of Posts and telecommunications Zeng She thesis first introduced the index, SQL statement optimization, data prefetching, approximate matching and distributed query, such as the existing mass data query technology, and summed up the application of various technologies. Then the classical top-k query algorithm is analyzed, based on the TA (Threshold algorithm) algorithm and the NRA (No Random Access) algorithm and approximate matching query thought ...

In our development of the efficiency has been a problem, especially for a lot of large data operations, today we ran into a random query data, at first we may think of the simplest order by RAND () to operate but the efficiency is not flattering ah. Recently, because of the need to study the MySQL random extraction implementation method. For example, to randomly extract a record from the TableName table, the general wording is: SELECT * from TableName ORDER by RAND () LIM ...

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Search engine (engine) means to collect information on the Internet according to certain strategies, to use specific computer programs, and to provide users with retrieval service after organizing and processing the information.     From the user's point of view, the search engine provides a page containing the search box, input words in the search box, through the browser submitted to the search engine, the search engine will return to the user input information related to the list. Internet development in the early days to ya ...

China News agency, Beijing, May 22 (Xinhua Liu Yuying) Due to the Storm audio and video site domain name resolution problems, the number of provinces in the province of 19th, a large range of network failures.　　Experts from China's national domain name Registry have pointed out that this exposes the potential security risks in the links of China's domain name management system.　　19th, Jiangsu, Anhui, Guangxi, Hainan, Gansu, Zhejiang and other provinces have netizens reflect not open the Web page, QQ, MSN and other Instant Messaging tools drop line and so on. China Telecom ruled out the trouble that night after explaining that the storm audio and video site's own domain name resolution failure caused the Chinese telecom DNS service ...