MySQL

SELECT * from Information_schema.plugins\gThe InnoDB version of MySQL 5.6.3-M6 is 1.2.3View the version method, you can see the large versionSELECT * from Information_schema.plugins;SELECT @ @innodb_version;MySQL 5.5:MySQL Plugin Status Date5.5.18 1.

17. Updating and deleting dataUpdated: Update table Set columns = ' value ' where ...Mysql> UpdatePw_priceSetPrice=10000 whereUid=6; Query OK,1Row affected (0.03sec) Rows matched:1Changed:1Warnings:0MySQL> Select * fromPw_price;+-----+-------+------

Error when using MySQL update inUpdate area set status= "on" where ID in (the Select ID from the area where status= ' "and name like '% City jurisdiction ')[sql]update area set status= ' "Where ID in" (select ID from the area where status= ' to '

MySQL commonly used storage engine is myisam, InnoDB, memory, MERGE , Where InnoDB provides a transaction security table, the other storage engines are non-transactional security tables. &NBSP myisam is the default storage engine for MySQL.

Requirement: After you insert a record into the MySQL database using MyBatis, you need to return the self-increment primary key value for that record. Method: Specify the Keyproperty property in Mapper, as shown in the following example: insert

1. The role of keyword delimiter①delimiter is called "delimiter" and can often see the contents of DELIMITER $$ in statements such as compound SQL statements or stored procedures.The meaning of ②delimiter $$ is to tell the MySQL interpreter that the

MySQL Master Master replication setupSet the Bin-log, and configure the other person for their master1. Build1.1 Master1 is configured as a master for Master2Master configuration

1. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. Avoid null-valued fields in the WHERE clause, which will cause the engine to

Problem Description: Through the above statement, you will find that the MySQL like query is not case-sensitive, because my mistake, Joe was written to find this stuff. But, sometimes, we need to be case-sensitive, what should we do? Here's how to

/*** Read Excel Insert MYSLQ*/Package com.excel;import Java.io.BufferedInputStream; import Java.io.File; import Java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.sql.Connection; import

Today re-installed MySQL, to the last step of the times wrong, is the third small step that hit the fork. At that time, I felt the trouble, I remember the original problem, but also deleted things, but also restarted.Later inadvertently found that

The recent MHA authentication encountered Dbd::mysql::d r::imp_data_size unexpectedly this error. The DBD package is already installed. The following is a description of the problem and a solution.1. Fault description# MASTERHA_CHECK_REPL--CONF=/ETC/

This thing should be useful, so try to experiment in your own notebook some time ago, the result is not successful.When I came back yesterday, I thought it was time to do something, so I thought about it.Preliminary understanding is: The master

MySQL's master-slave building There are many ways, the traditional mysqldump way is one of many people's choice. However, this approach is not an ideal choice for larger databases. Use Xtrabackup to quickly and easily build or repair MySQL

mysql> SHOW VARIABLES like ' character_set_% ';+--------------------------+----------------------------+| variable_name | Value |+--------------------------+----------------------------+| character_set_client | Latin1 || character_set_connection |

Resolving MySQL data case sensitive issues with binary:Binary is not a function, it is a type conversion operator, and it is used to force the string following it to be a binary string, which can be understood to be case-sensitive when comparing

When the unique column inserts a record with duplicate values on a unique key, the default insert will report a 1062 error, and MySQL has three different processing methods, as described below.Create a unique constraint on the ID column by creating 2

1, choose the most applicable field properties, as far as possible to reduce the definition of field length, as far as possible to set the field not NULL, such as ' Province, gender ', preferably set to enum2. Use connection (join) instead of

Install mysql in linux 1. Download mysql. Here I advocate binary installation. Use winSCP to transmit the downloaded mysql to the linux Server 2. decompress the downloaded mysql package #tar -zxvf /{MySQL5.6_path}/mysql-{version}.tar.gzHere there

MySQL knowledge Summary (1) installation and configuration (Linux CentOS), mysqlcentos1 Installation Environment CentOS Yum install-y mysql-server mysql-deve Service Startup1.1 start Service mysqld start1.2 restart Service mysqld restartStop