MySQL

Mysql Create, view, modify, and delete tables1. Create a tableCreate a syntax form for a table:CREATE TABLE Table Name (property name data type constraint, property name data type constraint,

1. RequirementsUse C # to access MySQL database for curd2. Installation and class library referencesHttp://www.tuicool.com/articles/rAbueeThe package in the Baidu Cloud disk, can also be downloaded through the official3. Database Operation

My test machine for a long time did not use MySQL, the password forgotten, now need to login, and then change the password, the steps are as follows:1. Stop the database/etc/init.d/mysqld stop2. Modify MY.CNFModify the My.cnf file to add

First, the basic grammarSELECT statement 1-All SELECT statements must have a consistent number of fields, regardless of type.Union [Union option]--Same as the Select option, All (reserved All) and distinct (de-weight), the default value is

Reprint Address: http://blog.itpub.net/22664653/viewspace-723506/written in front of the words: Always in the aftermath of the disaster, only remember the importance of disaster tolerance, always after eating a loss, just remember that someone had

MySQL FOREIGN key1. What is a foreign keyA specific relationship between a table and a table. Maintain the integrity and consistency of your data.User tableOrder Orders Form1.1 Delete the user, do not delete the order, the data is inconsistentInsert

Just started to write MySQL statements more cumbersome, noisy, summed up a few points should be noted:1 note punctuation, when creating a table create table, the parentheses contain the contents of the "," number split open, the last statement does

1,MySQL master and slave skipped an error in the transaction#停止slave进程stop slave, #跳过一个事务set global sql_slave_skip_counter=1; #启动slave进程start slave; 2. Reclaim Permissions#回收超级权限revoke  grant option on *.* (Library. Table)  from admin (user

Tables related to users and passwords:1) pre_common_members, pre_ucenter_members2) The password in the Pre_common_members table is only a one-time MD5 encryption of the random code, when the user logs in does not use the Web login password only

Just started to write MySQL statements more cumbersome, noisy, summed up a few points should be noted:1 note punctuation, when creating a table create table, the parentheses contain the contents of the "," number split open, the last statement does

Query connectivity is divided into 4 categories: inner, outer, cross, naturalOne, cross joinSELECT * FROM Table a cross join table B; -the result is a Cartesian product, which is equivalent to the SELECT * from Table A, table B; Avoid usingTwo,

Problem:CREATE TABLE A ( ID varchar (primary) key, ver int, ...)There are federated indexes on the Id,ver, 10,000 dataWhy is the select ID from the A order by ID particularly slow?and select ID from A ORDER by id,ver very fastMy watch has

#MySQL内存表和临时表DROP TABLE IF EXISTStbl;CREATE TABLEtbl (IDINT not NULLAuto_increment, TitleVARCHAR( -) not NULL, authorVARCHAR( -) not NULL, PRIMARY KEY(ID)) ENGINE=INNODBDEFAULTCHARSET=UTF8;INSERT intoTBL (title, author)VALUES('Learn

In the search interface to play T, you can come out Terminal command interface, and then refer to the article operationhttps://my.oschina.net/chaon/blog/703562Quite powerful article, the operation of the process of prompting the current user's

Whether it is in the small, free database space or large e-commerce site, reasonable design table structure, make full use of space is very necessary. This requires that we have a good understanding of the common data types of the database system.

Http://www.2cto.com/database/201204/126775.htmlApache 80 ports are occupiedMySQL 3306 Port is occupiedThe solution of MySQL Chinese garbled problem under XAMPPSymptom Description: The MySQL database is built-in after the installation is complete

[Reprinted] mysql PARTITION and mysqlpartition Address: http://lobert.iteye.com/blog/1955841 The previous day, we got a table with nearly million data records and no indexes or primary keys. (This table is definitely a talent) This is a log table

MySQL index and Optimization Preface: indexes have a crucial impact on the query speed. Understanding indexes is also the starting point for optimizing database performance. Consider the following: Assume that a table in the database has 10 ^ 6

Linux mysql installation tutorial, linuxmysql tutorial For MySQL on all platforms: Download MySQL. Select the MySQL Community Server version you need and the corresponding platform. MySQL-MySQL server. You need this option unless you only want to

How to modify the MySQL initial password for MAC Problem description: I bought a mac computer and installed mysql for the first time. I don't know how to change the initial