MySQL

One, 1 CREATE TABLE name (name VARCHAR (10));For this table, by default, the results of the following two queries are the same:SELECT * from TABLE NAME WHERE name= ' clip ';SELECT * from TABLE NAME WHERE name= ' Clip ';The MySQL default query is

Navicat Premium is a multi-connection database management tool that allows you to connect at the same time as a single program.Navicat Premium enables you to easily and quickly transfer data between various database systems, or to transfer a plain

Environment:salt_master:192.168.100.228salt_client1:192.168.100.245Master client version consistent [[email protected]_server base]# Salt--versions-report salt:0.17.5 python:2.6.6 (R2  66:84292, June, 14:18:47) Jinja2:unknown m2crypto:0.20.2 msgpack-

--Query statementsSELECT * from student; -Low efficiency, generally not recommendedSELECT tid,tname from student;SELECT Tname as name from student;SELECT * from student WHERE 1=1;SELECT tname from student; --Specify the query for individual

Original address: http://www.im286.com/thread-7091552-1-1.htmlGo back to BackupThe study of some stochastic factors is mainly about the efficiency problem.Statement one:Select from 1The instructions in the MySQL Manual for rand () probably mean

In general, how to detect the content of the two tables is consistent, such requirements are mostly reflected from the machine to ensure data consistency. There are two methods, the first is to start from the database, the second is to start from

In the development process we generally need to remember the creation time of a record, in MySQL if you use the datetime type, cannot set the default value, we can use the timestamp type to record the creation time. But there's a problem with that,

In the process of using MySQL, you may encounter a similar problem:[email protected] 07:42:00>select * FROM test where C1 like ' ab% ';+-----+| C1 |+-----+| ABC || ABD |+-----+Fuzzy matching ab%, the result of a string beginning with AB also appears

In the process of using MySQL, you may encounter a similar problem:[email protected] 07:42:00>select * FROM test where C1 like 'ab%';+-----+| C1 |+-----+| ABC || ABD |+-----+Fuzzy matching ab%, the result of a string beginning with AB also appears

MySQL is not like some other databases can throw exceptions in triggers to interrupt the execution of course triggers to prevent the execution of the corresponding SQL statement. It is not possible to throw exceptions directly in the MySQL directory

On Master server:1. Disable SELinux and iptablesService Iptables StopChkconfig iptables off; Chkconfig Ip6tables offSetenforce 0Vi/etc/sysconfig/selinuxSelinux=disabled2. Yum-y Install Mysql-serverService MySQL start; Chkconfig mysqld onMysql_secure_

MySQL concat (str1,str2 ...) Connect two strings, (numbers are also possible and will be converted into strings)MySQL's concat function will return NULL if one is null when the string is concatenated.mysql> select concat(‘11‘,‘22‘,null);+------------

mysql default off telnet permission , the following actions allow users to log in at any location: 1. Enter mysql,grant all privileges on * * to ' root ' @ '% ' identified by ' with GRANT Option;iden Tified by is followed by a password, which can

When you perform a batch update of a database with MySQL Workbench, executing a statement encounters the following error message:Error code:1175You is using Safe...without a WHERE that uses a KEY columnBecause it is the default security setting for

Installing MySQL today encounters MySQL ERROR 1130:host is not allowed to connect to this MySQL server,Tried a lot of ways.Skip-grant-tables placed in My.ini [mysqld]1. Change the login of any hostmysql> use MySQL;mysql> Update user Set host = '% '

Create a tableCREATE TABLE TT1 (ID int primary KEY, C1 int);CREATE TABLE TT2 (ID int primary KEY, C2 int);INSERT into TT1 values (2,2), (3,3), (bis);INSERT into TT2 values (2,2);II. implementation plans and issuesmysql> explain EXTENDED Select Tt1.c1

There are three ways to allow MySQL remote access in Fedora:A, change the table.mysql> usemysql;mysql>Update user set host = '% ' where user = ' root ';mysql>Select Host, user from user;b, Authorization.For example, you want to use root 123456 from

The people who do know, the distress of repeating the test database.Usage: # Usage:./script user Password Dbnane mysql.nixcraft.in~~~~~~~~~~~~~#!/bin/bash# Delete all tables in MySQLExample# Usage:./script User Password Dbnane# Usage:./script user

MySQL character set encodingMySQL character set encoding Summary I shared an article on the mysql character set on my internal blog. I have not studied the mysql character set before. After seeing this article, I am somewhat confused, I went to the

Install MySQL5.5 in RPM Mode Under CentOS/RHEL6 + Go to http://dev.mysql.com/downloads/mysql/5.5.html#downloads: Download the following three files respectively (because my machine is 32-bit, the following is a 32-bit package. If your machine is