mysql key value table

Key differs from primary keyKey is usually the index synonym. If the keyword attribute primary key is given in the column definition, then primary key can also be specified as key only. The purpose of this is to be compatible with other database

Day02The MySQL key value (key) # #设置在字段上, which constrains how to assign a value to a field.Normal indexUnique Indexes UniquePrimary KEY Primary KeyFOREIGN key foreign keyFull-Text Index fulltext+++++++++++++++++++++++++++++++++++1.1 Use of index

MySQL常用指令，java，php程序员，数据库工程师必备。程序员小冰常用资料整理MySQL common commands (for reference)The most common display commands are:1. Display the list of databases.show databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

MySQL table sharding Methods: MySQL I. Let me explain why Table sharding is required. When a piece of data reaches several millions, it takes more time for you to query the data at a time. If there is a joint query, I think it may die there. The

MySQL foreign key details, MySQL key details Recently, when I was studying Hibernate, I was always confused by foreign keys. Moreover, my MySQL foreign key learning is not very solid, so in order to better master Hibernate and MySQL, therefore, I

1. What is referential integrity? Integrity of reference (integrity constraints) is an important concept in database design. When a table in the database is associated with one or more tables, the integrity of reference is involved. For example, the

Concept: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

1. Full backup and incremental backup 1.1 full-scale backupFull-volume data is all the data in the database, and a full backup is the backup of all the data in the database.Back Up all libraries:mysqldump -uroot -p123456 -S /data/3306/mysql.sock -F -

One: Field modifier1:null and NOT NULL modifiersLet's take a look at this example.Mysql> CREATE TABLE worker (ID int not null,name varchar (8) Not null,pass varchar (a) not null);Mysql> INSERT into worker values (1, ' HA ', ' 123456 ');Mysql> INSERT

Mysql auto-incrementing column leads to duplicate primary key issue analysis..., mysql primary key A few days ago, the development of shoes reported a problem of using the load data infile command to import data primary key conflicts. After analysis,