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This article is referenced from:http://blog.csdn.net/bingqingsuimeng/article/details/51595560First, what is the primary key, foreign key:There are several attributes in a record in a relational database, which can be a primary key if one of the attribute groups (note is a group) uniquely identifies a record.Like whatStudent Table (School number, name, gender, Class)Each student's school number is unique, th
Tags: primary key first break range Ror add comment art DropSQL PRIMARY KEY ConstraintThe PRIMARY KEY constraint uniquely identifies each record in a database table. The primary key must contain a unique value. Primary key columns cannot contain NULL values. Each table shoul
login information and become a basic solution for Internet security, which has become a standard configuration for Linux systems.It should be noted that SSH is only a protocol, there are many implementations, both commercial and open source implementation. The implementation of this article is OpenSSH, it is free software, the application is very extensive.Encrypting all transmitted data so that the "man-in-the-middle" attack is not possible, and it can prevent DNS and IP spoofing, which is SSH
First, what is primary key, foreign key:A record in a relational database has several properties, and if one of the attribute groups (note the group) uniquely identifies a record, the attribute group can be a primary key such as: Student form (school number, name, gender, Class) Each student's number is unique, and the number is a primary key. User table (user
1. Definition 1.1 What are primary keys and foreign keys 1.2 The role of primary and foreign keys 1.3 Differences between primary key, foreign key, and index 2. Primary key (primary key) 2.1 Setting the primary key via SSMs 2.2 Setting prim
Bob,alice and digital certificates The most well-known characters in network security are probably Bob and Alice, because many of the security principles are illustrated with these two virtual characters. Let's see how Bob gets a digital certificate from the CA Center: 1, Bob first creates his own key pair (key pair), including the public key and private
The definition of a primary key: A collection of columns or columns that is used to uniquely identify a row in a table. Only one primary key is allowed on a table.When we specify a primary key in the database, it is defined by a PRIMARY key constraint. When you create a PRIMARY key
I,Public KeyEncryptionAssume that I have two numbers: 1 and 2. I like the number 2 and keep it. I won't tell you (Private Key), and I will tell you that 1 is my public key. I have a file that cannot be viewed by others. I use 1 for encryption. Someone else finds this file, but he does not know that 2 is the decryption private key, so he cannot undo it. Only I can
1. The public key and private key appear in pairs. 2. Public Keys are called public keys. Only private keys that you know are called public keys. 3. Only the corresponding private key can decrypt the data encrypted with the public key. 4. Only the corresponding public key ca
Desktop operation:? Snap window: Win + Left/right > win + up/down > window can be changed to 1/4 size placed in 4 corners of screen? Toggle window: Alt + Tab (not new, but task switch interface improved)? Task view: Win + Tab (Release keyboard interface does not disappear)? Create a new Virtual desktop: Win + Ctrl + D? Close the current virtual desktop: Win + Ctrl + F4? Switch Virtual desktops: Win + Ctrl + Left/RightIn addition, Microsoft has added Ctrl + V support for the WIN10 command line, a
The concept of public key: The public key can be transmitted over the network, that is, the receiving sender can know each other's public key, of course, if you use network sniffing technology, you can also sniff the content of the public key on the network, but you only have the public
Tags: style blog ar color sp for on data divThe role of the primary and foreign keys of sql:Foreign key value rule: A null value or a reference primary key value.(1) When a non-null value is inserted, it cannot be inserted if the value is not in the primary key table.(2) When updating, you cannot change the value that is not in the primary
Tags: different HTML range prevents intermediate replace between following tables create tableConcept: A primary key (primary key) uniquely identifies a property or group of properties for a row in a table. A table can have only one primary key, but there may be multiple candidate indexes. Primary keys often form referential integrity constraints with foreign ke
Tag: Symmetric key asymmetric password public key(i) Symmetric encryption (symmetric cryptography)Symmetric key encryption, also known as private key encryption, that is, the sender and receiver of the information with a key to encrypt and decrypt the data. Its biggest advan
: This article mainly introduces the opensslrsa key format and solves the key format issues for php and c ++ collaborative development. For more information about PHP tutorials, see. OpenSSL programming-RSA programming This article was published by maxcompute in June 26, 2014. Views: 1,954, comments: 0 I. RSA PEM file format 1. PEM private key format file----- B
clarify its realization principle.Overview of the two overall structureIf you use the SSL protocol to access a webpage, the steps are as follows:User: Enter https://www.sslserver.com in the address bar of the browserHTTP layer: Translates user requirements into HTTP requests, such asGet/index.htm http/1.1Host http://www.sslserver.comSSL layer: Negotiates a cryptographic key with the channel security of the underlying protocol and encrypts the HTTP re
Hibernate primary key generation policy and hibernate primary key policy Hibernate Primary Key Generation Policy 1. Automatic growth of identity Applicable to MySQL, DB2, and ms SQL Server. It uses the primary key generated by the database to generate unique identifiers for long, short, and int types.Use auto-incremen
About innodb locks (record, gap, Next-Key lock) and innodbnext-key Record lock locks a single index record. Record lock always locks the index instead of the record itself, even if the table does not have any indexes, then innodb will create a hidden clustered primary key index in the background, and the lock is the hidden clustered primary
1 What is the primary key foreign keyStudent form (school number, name, gender, Class) number is a primary keyCurriculum (course number, course name, credit) course number is a primary keyThe attribute group of the academic number and course number to form a primary keyThe school number in the score table is not the primary key of the score table, but the primary key
This involves mainly the concepts in cryptography. In general, we also have cryptography-like things in our computer, such as kerbovers, so we can leave them here for more information. I have previously written an article titled "secure login authentication Design for websites", which may not be clear enough. One reader left a message to question: "The public key is public as its name implies, who will have your public
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