Distinct Command

Hive in the official document of the query language has a very detailed description, please refer to: http://wiki.apache.org/hadoop/Hive/LanguageManual, most of the content of this article is translated from this page, Some of the things that need to be noted during the use process are added. Create tablecreate [EXTERNAL] TABLE [IF not EXISTS] table_name [col_name data_t ...

With the proliferation of data volume, Mysql+memcache has not met the needs of large-scale Internet applications, many organizations have chosen Redis as its architectural complement, however, redis the use of the threshold is not low, such as not supporting SQL, here for everyone to share the Redis use of the full raiders. Redis, one of the most closely watched NoSQL databases, has been used by many well-known internet companies, such as Sina Weibo, Pinterest and Viacom. However, being born with no support for SQL makes him look difficult ...

This article describes how to set up a large number of spoke VPNs by using quick mode selector source definitions on the spoke FortiGates and the dialup VPN configurations on the hub FortiGates.

1.count Count returns the number of documents in the collection &http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp;db.refactor.count () No matter how large the collection is, the number of documents can be returned quickly. You can pass the query, MongoDB calculates the number of query results Db.refactor.count ({...).

The continuous advancement of global informatization makes the change of social information more and more rapid, fast information communication has become the normal life of people must, and video communication is precisely the use of this market demand completed by the "information representation" to "represent information" of the perfect transformation. As the fields involved are widening and the industry is becoming more and more refined, the demand for video communication systems is becoming more and more diversified. 　　Under the background of the open application in this industry, the large screen display product becomes the important member of the video communication system display terminal. With the advent of the industry application refinement era, video communication applications have been put ...

class= "Post_content" itemprop= "Articlebody" > was just a game device when the Xbox was unveiled 3,608 years ago. But over time, Xbox 360 not only has more and more good games, multimedia features and applications are also gradually joined. By the year 2008, Microsoft has made the Xbox interface much closer to Zune and Windows Media C ...

Orient DB is a scalable document database that supports ACID transaction processing. Implemented using Java 5. Orientdb is an Open-source NoSQL database management system, written in Java, a document-type database that supports acid tx,http://www.aliyun.com/zixun/aggregation/16666.html "> Indexes,asynch queries,sql Layer ...

1, can you introduce Amoy Lok? Why companies choose to enter the hand-travel market at this time? Mobile games currently in the company's investment in what is the proportion? Amoy Lok was founded in 2009, although it is a young entrepreneurial Companies, but our core members are from the world-renowned Internet companies have rich experience in the development of online games, the average employment years of about 8 years, participated in several market-acclaimed online games. The first client game, "Peach Blossom" in 2011 formally launched operations, impressive performance. Game industry after 10 years of development, tour ...

The word game engine, which has a history of only more than 10 years, has had a profound effect on the development of the game.　　It provides a game from graphics, sound, script, database, network, equipment and other modules to provide a ready-made model solution, greatly reducing the production cycle of a game and capital investment, which spawned a masterpiece. From the original Wolfenstein 3D, Underworld, to the first authorized doom, the milestone build, and then to the true meaning of 3D engine quake, shocking unre ...

Wen/Shanhai as a pioneer of the transformation of traditional enterprises to the Internet, http://www.aliyun.com/zixun/aggregation/6475.html "> Suning Appliance (Road of transformation) is not so smooth, even the process is full of thorns." Even has always been optimistic about the transformation of Su Ning to the Internet capital market, the recent attitude to its 180 degrees of change, they have chosen to "isolate" Suningyun business, this and 8 months ago by the capital market hot Suningyun to create a sharp contrast, but also ...