Random Query

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 ...

Recently due to the need to study about MYSQL based random extraction method. For example, to randomly extract a record from the table table, we generally write: SELECT * FROM tablename ORDER BY RAND () LIMIT 1. However, I checked the official MYSQL manual, which prompts for RAND () probably means that the ORDER BY clause can not be used inside the RAND () function, because this will lead to multiple data columns were swept ...

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Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall The advantage of adding a random article List to the page is to reduce the similarity of the page in the site, Avoid dealing with search engines by copying pages as pages. My QQ code station, this station is this situation. The function to implement is: output a list of random articles, each time the HTML page generated, the list is not the same, each ...

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Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall the day before yesterday with you share about Baidu query outside the chain of the article" Analysis of Baidu Domain inaccuracy ", Inside mentioned, because Baidu domain inaccurate, a lot of webmaster use Yahoo query outside the chain method, but last November, Yahoo closed the query outside the chain function, a lot of webmaster are overwhelmed ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest Cloud host Technology Hall We all know that the site's inverse link number, determines the site link popularity- -Of course, the quality of the inverse link is just as important--which ultimately affects the site's ranking in search engines. Therefore, in the site optimization process, at any time to grasp what sites, how many sites set up to point to me ...

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 ...