Define Foreign Key In Database

If a computer manufacturer, its database holds machine and accessories product information. The table used to save the whole product information is called pc; the table used to save the parts supply information is called parts. There is a field in the pc table, used to describe the type of CPU used in this computer; there is a field in the parts table, the description of the CPU model, we can think of it as a list of all CPU models. Obviously, the CPU used by this manufacturer must be a model that exists in the supply information sheet. At this time, two tables ...

In the siege of large manufacturers such as Oracle, IBM and Microsoft, domestic database makers are still struggling to survive. This is an undeniable fact that the database market is close to saturation, especially in the face of the relationship between the transaction database field, foreign manufacturers start early, rich in resources, and also continue to encroach on the market segments, has formed a huge advantage. Faced with this situation, the South's general CTO Vounie that the domestic database manufacturers have missed the best time, should not take their own short board (OLTP) to go head-to-head, but should be in the direction of OLAP. Accompanied by large data ...

In the siege of large manufacturers such as Oracle, IBM and Microsoft, domestic database makers are still struggling to survive. This is an undeniable fact that the database market is close to saturation, especially in the face of the relationship between the transaction database field, foreign manufacturers start early, rich in resources, and also continue to encroach on the market segments, has formed a huge advantage. Faced with this situation, the South's general CTO Vounie that the domestic database manufacturers have missed the best time, should not take their own short board (OLTP) to go head-to-head, but should be in the direction of OLAP. Accompanied by large data ...

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 ...

What is a column-oriented open source distributed database HBase release time: 2012.04.16 14:41 Source: News and Author: HBase is a distributed, column-oriented open source database, developed by the Apache Foundation. Unlike a generic relational database, HBase is a database suitable for unstructured data storage. It is based on a column rather than a row based pattern. User stores data ...

On the one hand, it accelerates the information transmission speed of safety production accident, which leads to the unprecedented upsurge of safety production, on the other hand, it brings "sharp weapon" to solve the problem of safety production. At present, the big data is penetrating to more and more fields with astonishing speed, the successful case of application big data such as electric business, retailer, it enterprise is not uncommon. Large data in the application of safe production, the most basic function is to look for the accident occurrence law from the massive production safety data, predicts the future, thus the right remedy, the effective containment accident occurrence. At the same time, large data in the promotion of safety supervision capacity and ...

On the one hand, it accelerates the information transmission speed of safety production accident, which leads to the unprecedented upsurge of safety production, on the other hand, it brings "sharp weapon" to solve the problem of safety production. At present, the big data is penetrating to more and more fields with astonishing speed, the successful case of application big data such as electric business, retailer, it enterprise is not uncommon. Large data in the application of safe production, the most basic function is to look for the accident occurrence law from the massive production safety data, predicts the future, thus the right remedy, the effective containment accident occurrence. At the same time, large data in the promotion of safety supervision capacity and ...

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 concept of large data, for domestic enterprises may be slightly unfamiliar, the mainland is currently engaged in this area of small enterprises. But in foreign countries, big data is seen by technology companies as another big business opportunity after cloud computing, with a large number of well-known companies, including Microsoft, Google, Amazon and Microsoft, that have nuggets in the market. In addition, many start-ups are also starting to join the big-data gold rush, an area that has become a real Red sea. In this paper, the author of the world today in the large data field of the most powerful enterprises, some of them are computers or the Internet field of the Giants, there are ...

February 9, in the name of "Avenue to Jane", SAP company in Beijing released its new Business Suite SAP Business Suite 4 SAP HANA (hereinafter referred to as SAP S/4hana), SAP Executive board Member, SAP Global Business President Anrubo (ROB Enslin), SAP Business Suite Senior sales vice president Markus Schwarz and SAP Greater China President Guibing (MARK GIBBS) presented the SAP strategy at the press conference.