Terms used in review

IPX: Internet Group Exchange Protocol

(IPX: Internetwork
Packet Exchange Protocol)

The Internet Group Exchange Protocol (IPX) is
Early network protocols supported by the Novell NetWare operating system to route data packets in an interconnected network. IPX is a datagram protocol for connectionless communications-similar
The Internet Protocol (IP) in the TCP/IP protocol group ). Its high-level protocols, such
SPX and NCP mainly provide error recovery services.

The Internet Group Exchange Protocol (IPX) is
Early network protocols supported by the Novell NetWare operating system to route data packets in an interconnected network. IPX is a datagram protocol for connectionless communications-similar
The Internet Protocol (IP) in the TCP/IP protocol group ). Its high-level protocols, such
SPX and NCP mainly provide error recovery services.

IPX-Protocol Composition

The IPX protocol cluster includes the following main Protocols:

[1] IPX: layer-3 protocol, used to select and forward packets through the Internet. It specifies a connectionless datagram, which is equivalent to the IP protocol in the TCP/IP protocol cluster;

[2] SPX: sequenced Packet Exchange Protocol. Is the layer-4 connection-oriented protocol in the IPX protocol cluster, which is equivalent to the TCP protocol in the TCP/IP protocol cluster;

[3] NCP: NetWare Core Protocol, which provides connections and applications from customers to servers;

[4] SAP: service advertising protocol, used to advertise network services on the IPX network;

[5] IPX rip: routing information protocol (Routing Information Protocol) to exchange route information between routers and form a route table.

FoxPro

Visual FoxPro, formerly known as FOXBASE, was initially developed by Fox
The database product launched by software in 1988 runs on DOS and is compatible with the xbase series. FoxPro is an enhanced version of FOXBASE, and its maximum version has exceeded 2.6. Then, in February 1992
The software company was acquired by Microsoft and developed to run on Windows and changed its name
Visual FoxPro.

On April 9, March 13, 2007, Microsoft officially confirmed to a third-party developer that visual
FoxPro 9 will be Microsoft's last desktop database development tool, and VFP will never appear in the future.
10

J2EE is the Enterprise Edition of Java2 Platform (Java
2 platform, Enterprise Edition)

The core of J2EE is a set of technical specifications and guidelines. The components, service architecture, and technical layers contained in the Guidelines share common standards and specifications, allowing various platforms that follow the J2EE architecture, there is good compatibility to solve the problem of incompatibility between the information products used by the enterprise backend in the past and the difficulty of intercommunication between the enterprise and the outside.

 

SQL
Master attributeDifference from primary key

First, describe the tuples.

Tuples

A row in a table is a tuple, also known as a record.

Attribute

A column in a table is an attribute, also known as a field.

So what?
Primary Key:

One or more attribute groups in a table can uniquely identify a single tuples. attributes or attribute sets that uniquely identify a single tuple can be composed of multiple columns.

Primary attribute: Indicates the primary key column, that is, the primary key is composed of one column.

Static and dynamic tests

Static method means that the program itself is not run, and the correctness of the program is checked only by analyzing or checking the syntax, structure, process, and interface of the source program. Perform structure analysis, flow chart analysis, and symbol execution on the requirement specification, software design specification, and source program to find errors. The static method analyzes the static characteristics of the program to find out the deficiencies and suspicious points, for example, unmatched parameters, inappropriate nested loops and nested branches, unallowed recursion, unused variables, null pointer references, and suspicious calculations. Static Test results can be used to further identify errors and provide guidance for selecting test cases.

A dynamic testing method is used to check the differences between running results and expected results by running the program under test, and analyze the performance of running efficiency and robustness. This method consists of three parts: construct the output results of test instances, execution programs, and analysis programs.