Sql Count If True

MongoDB company formerly known as 10gen, founded in 2007, in 2013 received a sum of 231 million U.S. dollars in financing, the company's market value has been increased to 1 billion U.S. dollar level, this height is well-known open source company Red Hat (founded in 1993) 20 's struggle results. High-performance, easy to expand has been the foothold of the MongoDB, while the specification of documents and interfaces to make it more popular with users, this point from the analysis of the results of Db-engines's score is not difficult to see-just 1 years, MongoDB finished the 7th ...

When it comes to search, it is generally reminiscent of SQL Server's Fulltextsearch (full-text search) feature, which is really powerful, but it also needs to do some more tedious preparation work, Generally small projects or the search requirements (including performance requirements) is not very high in the case of practical it is still a bit too heavy.     Simple search with SQL query can be, but a general problem is how to search results by matching fields to prioritize. For example, there is a product list, ...

Whether it is government agencies, schools, games, http://www.aliyun.com/zixun/aggregation/7682.html "> online sales are inseparable from information, Content management System (CMS), is often the best choice for information." The first free open source content management system, with more than 4 years of open source experience, from the moment he was born, provoked the burden of leading the CMS industry, 1 years ago, the Dream Team formally formed, such a young and dynamic team gradually grow up, after ...

Hive is the most widely used SQL on Hadoop tool, and recently many major data companies have introduced new SQL tools such as Impala,tez,spark, based on column or memory hot data, although many people have a view of hive, inefficient, slow query, and many bugs. But Hive is still the most widely used and ubiquitous SQL on Hadoop tool. Taobao survey analysis of the previous report, Taobao 90% of the business run in hive above. The ratio of the storm audio and video ...

This series of articles is a learning record about the fundamentals of azure services development, and because of time constraints, the process of wishing to discuss and explore yourself is from scratch, to be able to develop basic programming for azure services. There may be a very deep topic relative to each topic, and I would like to have time to do it through other articles. 　　The positioning of this series is basically positioning, take 20-30 minutes, download the code first, follow the article, run to get the relevant experience. The previous article is about Azure queue storage, this is about ...

Intermediary trading http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host Technology Hall recently a customer requested small v to help their company site to do an English version, And the Chinese version and English version of the two site user data can be interoperable and does not affect the normal operation of the site. All right, start the egg pain toss, first read the official WordPress document: "WordPress data Structure ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host Technology Hall first, let's familiarize ourselves with the object methods that will be used. The data we use to get the last page passed over is typically used by the request object. Similarly, we can use the request object to get the uploaded file data ...

Several people familiar with the matter told Business Insider that in recent days there was a frightening new word circulating between Microsoft Sales Managers: consumption. "Consumption" is also referred to as "use", which refers to a customer's actual consumption of cloud computing resources. There is a disconnect between the number of customers registering Microsoft Cloud Computing Services and the number of customers who actually use those services because of the extensive cooperation agreement. People familiar with the matter said the disconnect created a wide range of problems within Microsoft, such as: to compete with Amazon's Network Service (AWS), Microsoft has been ...

To use Hadoop, data consolidation is critical and hbase is widely used. In general, you need to transfer data from existing types of databases or data files to HBase for different scenario patterns. The common approach is to use the Put method in the HBase API, to use the HBase Bulk Load tool, and to use a custom mapreduce job. The book "HBase Administration Cookbook" has a detailed description of these three ways, by Imp ...

Spark is a cluster computing platform that originated at the University of California, Berkeley Amplab. It is based on memory calculation, from many iterations of batch processing, eclectic data warehouse, flow processing and graph calculation and other computational paradigm, is a rare all-round player. Spark has formally applied to join the Apache incubator, from the "Spark" of the laboratory "" EDM into a large data technology platform for the emergence of the new sharp. This article mainly narrates the design thought of Spark. Spark, as its name shows, is an uncommon "flash" of large data. The specific characteristics are summarized as "light, fast ...