MySQL

Ifnull (EXPR1,EXPR2) //If EXPR1 is not Null,ifnull () returns EXPR1, otherwise it returns EXPR2. Ifnull () returns a numeric or string valueif (EXPR1,EXPR2,EXPR3)// if EXPR1 is true (expr1<>0 and Expr1<>null), then if () returns EXPR2, otherwise it

MySQL triggers are not used in the usual way, this time to use, feel particularly convenient. Simply summarize the usage.Let's take a look at the two triggers I wrote:/ * UPDATE trigger * / DROP TRIGGER IF EXISTS t_update_on_t_tradefee;create

Issue 1:1045 and 2003 errors are reported when unloading load MySQL.FIX: Click Skip to skip this error. Into the My.ini, under the mysqld add a sentence: Skip-grant-tables, save. Restart the MySQL service, run mysql-u in the cmd window root-p, will

Source: http://blog.csdn.net/luketty/article/details/5772429Indexed MySQL IndexAn index is a data structure that can be a b-tree, r-tree, or hash structure. Where R-tree is often used to query relatively close data, b-trees is suitable for finding

there are two in one Taichung MYSQL , the basic one 5.5 ( rpm package) configuration file /etc/my.cnf , not one of the outside 5.6 configuration file /home/app/mysql5.6/my.cnf5.6 Error Reporting2016-01-27 00:09:03 16056 [Note] Innodb:percona XtraDB (

According to the old boy's teacher's video, the risk of master-slave replication is that users with write access are connected to data changes from the library.Several methods are given in the video1) Reclaim the user's write permissions from the

For example: Join a userINSERT INTO Mysql.user (Host,user,password) VALUES ("localhost", "Test", Password ("1234"));Quote: The following errorError 1364 (HY000): Field ' ssl_cipher ' doesn ' t has a default value wrongmysql5.1 above version number,

This article will focus on a combination of two MySQL commands that will create a new data table of the same structure and data based on the original data table.This helps you to quickly copy tables as test data during development without risking

I've already written about how to create a Django project, and now we've got a little skeleton, and we need to do a lot of work to make this web project a bit of a meat person. Let's start with how to use the MySQL database in Django.　　premise: You

Login to the following websitehttp://dev.mysql.com/doc/650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M00/7A/2B/wKiom1akvUWSPLF6AAEbjptnbBg530.png "title=" A1. PNG "alt=" Wkiom1akvuwsplf6aaebjptnbbg530.png "/>Select the appropriate version

Generally speaking, the master-slave synchronization is, from the library to the master Library of a location point of backup, and then according to the main library Binlog log and continuously through the increment to perform additions and

Reference documents Http://www.111cn.net/database/mysql/58979.htm MySQL version Mysql-v MySQL Ver 14.14 distrib 5.6.25, for Linux (x86_64) using Editline Wrapper The company MySQL master server broken Time of failure: 2015-12-08-19:51:35 Recovery

Yesterday began to write code, the data inserted into the MySQL database, but there is no way to insert, Internet search, the final method is to insert the data in the phpMyAdmin after the conversion to PHP statements, and finally the following:$sql

http://wangwei007.blog.51cto.com/68019/965575first, the principle of MySQL master and slave1. Replication ThreadMySQL's Replication is an asynchronous replication process (mysql5.1.7 above versions are divided intoAsynchronous

Log in to MySQL today and give other users permission to run into problems mysql> Grant all privileges in testdb.* to " Dbuser " @" 10.4.14.14 " identified by " 5jyetq " ; ERROR 1044 (42000 ): Access denied Span style= "COLOR: #0000ff"

Go Http://www.4wei.cn/archives/category/mysql   A long time ago in an interview, the interviewer asked this question, due to the usual paging method is not many, only from the index, sub-table, using sub-query precision positioning offset, not

#!/bin/bash#User: bobo365#Date: 20160127User= ' WhoAmI 'If ["$USER"! = ' root '); thenecho "Please use root user,thanks"ExitFiMysql_user= ' Egrep-i mysql/etc/passwd 'If [-Z ' $MYSQL _user]; thenUseradd-r-s/sbin/nologin MySQLElseecho "user MySQL was

MySQL architecture selection for OLTP applicationsBefore we make up our mind to migrate core enterprise applications from enterprise-level databases to open-source database products and use local disks instead of shared storage. I think we must face

Verify the MyCAT Character Set The default Character Set of MyCAT is UTF8. The following describes how to check the log to verify the effect of different MySQL client character sets and server character sets on MyCAT. There are three main parts of

Configure tomcat Load Balancing for apache and nginx, and apachenginxtomcatOverview This article mainly introduces the configuration of apache and nginx. I have previously written an article on tomcat installation configuration, which details how to