MySQL

1, Substring_index (inaccurate):SELECT * from ' tvmars_channel ' WHERE ' name ' in (' Zhang Yimou ', ' 1080P ', ' Hong Kong movie ', ' Hollywood ', ' comedy movie ', ' action movie ') Order by Substring_index (' Zhang Yimou, 1080P, Hong Kong movie,

What is Mycat?Simple to understand as a MySQL middleware, it supports shunt, heartbeat-based automatic failover, support read and write separation, support MySQL master-slave, based on NIO management thread of high concurrency ...See official

Absolute value function abs ()Pi (), decimal default 6 bitsSquare root function sqrt ()Find the remainder function mod (x, y)Rounding up Ceil (x), CEILING (x)Take down the entire floor (x)Random number rand (), rand (x): Generates floating-point

Http://www.jb51.net/article/42441.htmMySQL Basics first, how to remotely access MySQL database Set permissions method summary, discuss access to a single database, all databases, specify user access, set access password, specify access to the host.1,

UsageMysql>show table status;Mysql>show table status like ' Esf_seller_history ' \g;Mysql>show table status like ' esf_% ' \g;Example:Mysql>show table status like ' Esf_seller_history ' \g;1.NameTable name2.Engine:Table's Storage

First, MySQL IntroductionWhen it comes to databases, we mostly think of relational databases, such as MySQL, Oracle, SQL Server, and so on, which are very easy to install on Windows, and if you want to install a database on Linux, I have to

Back to CatalogEF is a really powerful ORM tool that works well both in entity modeling and in entity relationships, and the recent code first has made it easier for me to use database changes, not to mention SQL Server support, because MSSQL itself

Chapter I.1. What is a database?The database contains two levels of meaning: the "warehouse" in which the data is stored, and the methods and techniques of data management.2. TableRow North is called a record, a column is called a field3. Primary

Mysql_user-Add or remove users from the MySQL database. Profile Requirements (on the host that executes the module) Options Example Notes State Support Profile Add or remove users from

Before we start this topic we first do a small experiment, compare regexp and like them two which is high efficiency, if the efficiency is too low, we do not need to do too much research, the experiment code is as follows:Require

The LAMP platform consists of four components in a hierarchical structure. Each layer provides a key part of the entire software stack: Linux, Apache, MySQL, PHP.   The origin of the word lamp originated in the German

In the Spring boot project using the MySQL database for database additions and deletions, the following error occurred:Error starting ApplicationContext. To display the Auto-configuration report re-run your application with ' debug ' enabled.2017-06-

Environment Description:Version 5.6.25-logMain Library ip:10.219.24.25From library ip:10.219.24.22OS Version: CentOS 6.7Hot standby software installed: XtrabackupFirewall is offAdd:Principle of Master-slave replication: http://blog.csdn.net/zhang1234

Open Databaseinput mysql-uroot-p in 1.cmd window2. Then prompt to enter the password3. If the MySQL server does not open error, you can use the following command to open the server The server did not turn on the error prompt: 2003 (HY000):

Show open tables;Based on my use of MySQL, the commonly used MySQL show statements are listed as follows:1.show databases; Displays the names of all databases in MySQL2.show tables [from database_name]; Displays the names of all tables in the

Reprint Please specify source: http://blog.csdn.net/l1028386804/article/details/46763665A trigger is a special stored procedure, in which the stored procedure is called with call, and the trigger does not need to use the callingIt does not need to

QPS (query per second) number of queries per secondTPS (Transaction per second) transaction volume per secondThis is the two important performance indicators of MySQL, which need to be viewed frequently, compared with the results of MySQL benchmark

One mysql master-slave synchronization problem and solution process, mysql master-slave synchronization process One mysql master-slave synchronization Solution Process Modify the table structure the day before yesterday and extend the field

Learning mysql syntax-basics (1), mysql syntax-Basics   PrefaceMysqlMysql syntax-This article uses Navicat Premium (Database Management Tool) to connect to mysql data.This article mainly consists of two parts:1. Create a user, create a database,

MySQL: select statement, mysqlselect statement 1. order by (SORT) A field is usually used as the reference standard for sorting. Syntax: order by [field] asc | desc; (ascending or descending) Tip: Check rules to determine the sorting