globally unique identifier

One, single-line function1. Definition: A function that returns a value for each row of records when querying against a table or view.2. Use: For SELECT statements, where conditions3. Classification:numeric function Number FunctionsCharacter

Data type true numberbigint integer data (all numbers) from -2^63 (-9223372036854775808) to 2^63-1 (9223372036854775807).int from -2^31 (-2,147,483,648) to 2^31-1 (2,147,483,647) for integer data (all numbers).smallint integer data from -2^15 (-32,76

SQL2008 expression: Is any combination of constants, variables, columns, or functions, and operators.1. String functionsFunction Name Parameter Example descriptionASCII (string expression)Select ASCII (' ABC ') returns 97Returns the ASCII code of

Data type Type Description Bit Integral type The bit data type is integral, and its value can only be 0, 1, or null. This data type is used to store data with only two possible values,

corresponding Relationship table SQL Server http://hovertree.com/menu/sqlserver/ C# Codesmith Data type Range of values Data type Range of values Null value instead of value Data type

Go to http://www.cnblogs.com/andy_tigger/archive/2011/08/21/2147745.htmlBit integral typeThe bit data type is integral, and its value can only be 0, 1, or null. This data type is used to store data that has only two possible values, such as Yes or

CommandHexdump Viewing binary files-n the number of bytes before the output file is formatted-C Output Specification 16 binary and ASCII codeLSBLK Viewing block devicesFdisk creating an MBR partitionGdisk creating a GPT partitionParted advanced

Bit: integer, value range [0,1,null], for accessing Boolean valuesTinyint: integer, value range [0~256]smallint: integer, value range [ -215~215]int: integral type, range of values [ -231~231]Decimal: Exact numeric type, example: Decimal (8,4);

Linux Storage ManagementType of disk interface:IDE: Parallel interface, from ata,133mbps,266mbpsSCSI: Small computer system interface,Sata:serial ATA serial interface;SAS: Serial InterfaceUsb:Another indicator for measuring disk IO capability:

The game manager of the win7 system can easily bring up the game manager of Win7, which can integrate a large number of games into a window and completely display the details of each game, therefore, it is very convenient for us to choose a game we

Article Title: Mac + Windows + Linux multi-system startup. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open

Common Data Types in SQL Server: SQL Server Data Types To http://www.cnblogs.com/andy_tigger/archive/2011/08/21/2147745.html Bit integerThe bit data type is an integer, and its value can only be 0, 1, or null. This data type is used to store data

The object-oriented idea is difficult to adapt to this distributed software model, so the idea of componentized programming has developed rapidly. According to the idea of componentized programming, complex applications are designed into small,

In SOA architecture, programmers often use XML to exchange structured and semi-structured data between applications. XML and Related Technologies-Document Object Model (DOM), XPath, HTTP, XQuery, and Extensible style sheet Language conversion

What is a GUID For those of you who dont know, a GUID (pronounced gooid-Globally unique identifier) is a 128-bit integer that can be used to uniquely identify something. you may store users or products in your database and you want somehow uniquely

This article describes how to generate non-repeated identifiers in PHP, which involves md5 conversion of time functions, uniqid () functions, and GUID applications, for more information about how to generate non-repeated identifiers in PHP, see the

This article outlines The goal of WEB sockets is to provide full-duplex, bidirectional communication on a single persistent connection. After JavaScript creates a Web socket, an HTTP request is sent to the browser to initiate the connection. After

With the continuous improvement of technology, Microsoft Windows has become the mainstream operating system in the field of personal computer applications. Windows operating system provides users with a favorite graphics Preface:With the continuous

Guide "Run" function is favored by many senior it home users, because it is simple, convenient and practical. In the old system such as Win7, the user can make the function display directly in the Start menu for easy operation. However, in Win10

Network Layer 2 (IPv4 and IPv6 addresses and related protocols) IP (internet protocol) protocol is the core protocol of the TCP/IP protocol family and the network layer of the internet. The current version number is 4, also known as IPv4. The next