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on size to determine what color the product will be. This is a hierarchical structure, but not a natural hierarchy-but it is not an unnatural hierarchy. Color and size form a hierarchy and nothing wrong, it's just a simple fact: the same size can appear in multiple color.The dimen
table can divide information into hierarchical levels of structure.Conclusion:1, the fact table is what you want to pay attention to;2. The dimension table is the angle from which you observe the transaction, and from what angle
physical model of the Data Warehouse.2. Basic concepts of fact tables and dimension tablesSimply speaking, the dimension table is the angle (dimension) in which you observe the object, and the
In the past, the dimension tables, fact tables, data analysis, BI and other concepts have some ambiguity. These days of study finally let these have some clues:A dimension represents the amount of data you want to analyze , such as when you analyze a product's sales, you ca
Hey, guys! Let's discuss Ajax today! This article is only applicable to comrades who have a certain degree of Ajax foundation, but are still in a vague state. Of course, experts can skip this article ~~~ I. Concepts Ajax (ASynchronousJAvascript +XML(Asynchronous JavaScript and XML )) Ii. Results Implement a no-refreshing effect and asynchronously fetch data from the background (not only AJAX can achieve th
Nginx proxy_buffer_size to solve the back-end service transmission data too much, in fact, the header is too big problem These three parameters have been set to fix the amount Proxy_buffer_size 64k; Proxy_buffers 4 32k; Proxy_busy_buffers_size 64k; In the spirit of excellence I turned the official websiteOfficial website explanation In general, I still do not
Refer to "Introduction to machine learning"Suppose we have a dataset that contains n points. These n points can be labeled as positive and negative examples using 2N methods. Therefore, the n number of points can define 2N different learning problems. If for any of these problems we are able to find a hypothesis that H belongs to H, separating the positive and negative examples, then we call H hash n points. That is, any learning problem that can be d
; direction 3: Big Data O M and cloud computing. If you are proficient in any direction, there will be no space in the "front (money)" way. What is the big data talent gap? Is Data Big Data
-topic to this side, the following into the subject, today mainly want to talk about the concept of data mining and some of the content of the data, relatively speaking, the theoretical content is too much, but deepen the understanding of these things will let you do data mining more purposeful. =======================
What is a data warehouse, and what is the difference between a databaseDataWarehouseis a subject-oriented (Subject oriented), integrated (integrate), A relatively stable (non-volatile), data collection that reflects historical cha
The difference between OLAP and OLTP and what is Data Warehouse OLAP is often referred to as a data warehouse. But the data warehouse is only part of OLAP, not all. OLTP multi-index tha
ways.It is associated with the idea of data mining as a process to recognize the novelty of the results. Many of the results of data mining are what we expect-and can be recalled. However, the fact that can be explained does not negate the value of digging out them. Without
)This is the magic of data structures.So what is an algorithm? This can only be forced to continue the analogy. I want to learn Kung fu. After I entered the book Room of martial Arts cheats, I ran out with a lot of books. Open a look, there is a dragon 18 palm, nine Yin Cano
A sentence to understand what is called data structure and algorithm, try to let people who do not understand the program can understand This issue has been closed due to non-development-related issues directly Reply content: A sentence to understand what is called
When an insert statement is used, what data needs to be enclosed by quotation marks and what data does not need to be enclosed by quotation marks?Create Database mydbUse mydbCreate Table customer_data(Customer_id smallint,First_name char (20 ),Last_name char (20 ),Phone char
the singleton mode, this object is called from the outside. However, if you follow the method I mentioned in the previous answer__getThe object called from the outside is injected into the internal attribute, and its advantages are obvious. In terms of writing, this reduces a lot of trouble and makes it clearer, in terms of performance, detection and function call consumption are reduced for multiple calls
What is the server used? Can data be saved? So what is the difference with the database? For example, the user's profile picture is stored on the server. I don't know what the server
What is a data warehouse?A data warehouse is a subject-oriented (Subject oriented), integrated (integrate), relatively stable (nonvolatile), data collection that reflects historical changes (time Variant) to support management dec
What is a data warehouse?A data warehouse is a subject-oriented (Subject oriented), integrated (integrate), relatively stable (nonvolatile), data collection that reflects historical changes (time Variant) to support management dec
What is the difference between OLAP and OLTP and what is data warehouse?OLAP is usually called a data warehouse. However, data warehouses ar
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