Create Unique Index Oracle

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Delve into the primary key issues of SQL Server tables

The logical design of database is a very broad problem. In this paper, the main key design of the table is discussed in the design of MS SQL Server, and the corresponding solutions are given. Primary key design status and problems about database table primary key design, in general, based on business requirements, based on business logic, the formation of primary key. For example, when sales to record sales, generally need two tables, one is the summary description of the sales list, records such as sales number, the total amount of a class of cases, and the other table record of each commodity ...

Cowboy Wang: The technical index that the industry website should have

Affirmation: The article is longer, if you are the industry webmaster please read carefully, welcome to join the industry webmaster QQ Group: 37466050 (using the invitation mechanism, add please specify the URL.) The rise of the industry web site has become an unstoppable trend in China's e-commerce development, according to a survey of 07 growth rate is expected to be close to 50%. For many industry websites, after a period of development, to seize the opportunity to win a certain market share.   At the same time, will face many new challenges, the market competition will become more and more fierce. Compared with the Internet companies that have VC support ...

Double 11 Data Operation Platform Order Feed Data Torrent Real-Time Analysis Solution

In 2017, the double eleven refreshed the record again. The transaction created a peak of 325,000 pens/second and a peak payment of 256,000 pens/second. Such transactions and payment records will form a real-time order feed data stream, which will be imported into the active service system of the data operation platform.

The story of Jerry Yang and Yahoo

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Hall Jerry Yang 1967 born monkey Online business opportunities, the wise to beat; Yahoo! What is the meaning?   Who is the largest media company in the world? Ph. D., a PhD student in the Department of Electronic Engineering at Stanford University, is a fellow of the same profession; his name is Jerry Yang, a few years ago with nothing, now a billionaire; Reuters and Yahoo Hand, Jerry Yang said, do this work, there is a feeling of jumping off the cliff;

The secret of Chief engineer: How LinkedIn's big data backstage works

Editor's note: Jay Kreps, a chief engineer from LinkedIn, says that logs exist almost at the time of the computer's creation, and there is a wide range of uses in addition to distributed computing or abstract distributed computing models. In this paper, he describes the principles of the log and the use of the log as a separate service to achieve data integration, real-time data processing and distributed system design. Article content is very dry, worth learning. Here's the original: I joined the LinkedIn company at an exciting time six years ago. From that time ...

The secret of Chief engineer: How LinkedIn's big data backstage works

Editor's note: Jay Kreps, a chief engineer from LinkedIn, says that logs exist almost at the time of the computer's creation, and there is a wide range of uses in addition to distributed computing or abstract distributed computing models. In this paper, he describes the principles of the log and the use of the log as a separate service to achieve data integration, real-time data processing and distributed system design. Article content is very dry, worth learning. Here's the original: I joined the LinkedIn company at an exciting time six years ago. From that time ...

Founders ' Conference: New things, greater pressures and our times

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Hall May 10, after three years, I was fortunate enough to participate in the ninth session of China Internet Entrepreneur Conference jointly organized by sing and Tencent. In the past few years of development, the Chinese Internet has undergone unprecedented changes, and the General Assembly from the "Webmaster Conference" transition to the "entrepreneur Conference", the focus of attention also from the traditional internet to mobile interconnection. This change causes us to think, not only the name and direction of change, but also our future Chinese internet people and even the entire human in the information explosion and mobile interconnection ...

Three major bottlenecks in large data processing: Large capacity, multiple format and speed

Guide: Yahoo CTO raymie Stata is a key figure in leading a massive data analysis engine. IBM and Hadoop are focusing more on massive amounts of data, and massive amounts of data are subtly altering businesses and IT departments. An increasing number of large enterprise datasets and all the technologies needed to create them, including storage, networking, analytics, archiving, and retrieval, are considered massive data. This vast amount of information directly drives the development of storage, servers, and security. It also brings a series of problems to the IT department that must be addressed. Information...

Vertical break-through horizontal expansion industry perpendicular market is the cloud era new blue sea

Ultimately, the ability to tap the hidden value of input and behavioral data can be the most critical capability for any SaaS provider to gain market success. This is an absolutely impressive number, as sales and marketing costs are often the biggest cost items in the business world. This article is written by Gordon Ritter. Gordon Ritter is one of the founders of Emergence Capital, a company devoted to investing in cloud, and a partner of the firm. In the era of cloud computing, he argues, professional firms focusing on vertical services will be in for a ...

"TERA" with Sony High-tech head-wearing monitor experience IMAX games

See the way to open the "TERA", with "science fiction" equipped with armed eyes, the most cool way to experience the first sexy games in Korea. Today, the Kunlun game with the help of Sony "science fiction World" display equipment, together to create the "TERA" National Service Audio-visual feast.             The player will be able to use Sony's latest head to wear display hmz-t3w experience "TERA", feel the rush to compare with IMAX visual effects of subversion-level audio-visual shock experience. s Sony's newest generation of head-wearing display hmz-t3w "TERA" as 3 a class ...

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