what is fact and dimension in data warehousing

What is the difference between directly returning data and Web service by getting the value of Post/get? What are the pros and cons? Suppose to make a simple API: Get commits the UserID and type, obtains both values after determining whether the UserID exists in the database, and returns the

determines its representation of external data. To decide what products and technologies to use to build the core of the data warehouse, we need to analyze the technical features of the Data Warehouse. For the existing business system data, extraction, cleaning, and effecti

What is the use of SQL Server to compress data files? Prelude: The other day, due to customer problems (in fact, piracy issues), you can only use the free sqlserver Express version. The data file size of the entire database of the Express version of sqlserver

binding what is the application scenario, what needs the data model and the view can be mapped to each other, it may be you do not realize, now a lot of sites can see this idea brings great convenience, such as forms, When filling out or submitting a form, the interface will be based on the user's actions in a timely

also use a variety of traditional DB as a carrier of the data warehouse, so don't say what you want to learn Data warehouse OK? To learn hive is to learn about hive, to learn data governance and to learn data governance.

How to judge what the file_get_contents data is encoded Title ------Solution-------------------- EUC-CN is the most commonly used representation of GB 2312. The "GB2312" on the browser encoding table is usually referred to as "EUC-CN" notation. But you can't get the righ

processing logic, and the policy is different message processing (I want to write a special article later)ArticleDescribes the mechanisms and policies ). What data-driven programming can do: As shown in the preceding example, it can be applied to function-level design. At the same time, it can also be applied in program-level design. For example, a table-d

What is the problem with this php file? How to enable PHP to automatically jump to this value link after writing data to the database Defined ('pcpay _ path') or exit; class record_control extends admin_control {public function add () {$ uid = $ this-> _ user ['uid']; if (empty ($ _ POST) {$ this-> _ pkey = 'content'; $ this-> _ ukey = 'record-add '; $ this-> _ t

that the mechanism is the message processing logic, and the policy is different message processing (I would like to write an article later to introduce the mechanism and policy ).What data-driven programming can do:As shown in the preceding example, it can be applied to function-level design.At the same time, it can a

A large number of IP addresses are required when addressing mobile data services. The current public IPv4 address has become a scarce resource, so mobile data operators are faced with the problem of choosing the address between IPV6 and private IPv4 addresses. At present, the industry generally believe that the 3G should be used IPV6 address. In addition, the choice of IPV6

memoryComparison between string and stringbuffer efficiencyIn some special cases, the string object will not change at a slower rate than the StringBuffer object, especially in the following string object generation, where string efficiency is far faster than StringBuffer:String"hello ""world"new"hello ""world" );You'll be surprised to find that the speed at which the string object was generated was simply too fast, and at this time StringBuffer had

finish the problem, but the time between them is very short because they adopt a simple method. Using good algorithms in programming can also reduce the time-space complexity of programs. My explanation...The data structure is to organize things described in reality in a way that can be interpreted by computers.An algorithm

first of all, what is an escape character? The escape character, in fact, is the specified PHP syntax with "\" to output. However, the syntax of the rules in different systems to transfer the role of the character is different, for example: in the Windows System carriage

What is Data Dictionary Each Oracle database contains a collection called "metadata", or data used to describe the database's data structure. Tables and views that contain the metadata are called ORACLE data dictionaries.Tables wi

For example, a complete job search information can include (basic personal information table, personal education information table, Personal Certificate Table, personal job search information table, and Personal Job Search renewal table .... I want to obtain a complete personal job information. I know two examples: A complete job information can include (Personal basic information table, personal education information table, Personal Certificate Table, personal job information table, and persona

What should I do if my website data is too slow to be paged? When using the MySQL database, data query at a large offset is very slow. How can I optimize SQL statements to accelerate paging query? Tool raw material MySQL database Apache (WEB server software) method step anal

of XML's popularity has been hard to verify, only known by the Java Enterprise application and the DOM (Document Object model) standard of the East wind. XML in Java enterprise applications is often used for the following purposes: Configuration file and transport format (SOAP, Simple Object Transfer Protocol). With the increase of Java application, the application of XML is also widening, but the whole

Data Mining (DW) is a very important part of business intelligence (BI) all week. What is the data mining in the end, this article will explore this. People often encounter this situation in their daily lives: supermarket operators want to be often bought together by the go

Webmaster should be very clear about the importance of analysis of the site optimization, you know the optimization of the site need to pay attention to what data analysis? If you don't know, then we will discuss the results of the discussion is to be engaged in SEO work friends to bring help. 　1th: Analysis of the ranking of keywords Through the analysis of k

I remember that when I took the postgraduate entrance exam, my professional courses were data structures and C ++. In order to prepare for the exam, I found the classic data structure teaching material of teacher Yan Yumin, I used C ++ to implement all the algorithms mentioned above. Unfortunately, my blog didn't become so popular today. Otherwise, I could write some experiences like guojing.In the evening,