MySQL

Public Static stringRetunsql (stringSstringe) { return @"IF ("+s+">"+e+@", DATEDIFF ("+ E +@", "+ S +@")-Floor (ABS (DATEDIFF (Subdate ( "+ E +@", Date_format ("+ E +@", '%w ')-1),"+ S +@")/7 * 1)) * 2 *-1, DATE DIFF ("+ E +@",

I. Introduction to the CLUSTERED index1. What is a clustered index?InnoDB ' s clustered indexes actually store a b-tree index and the rows together in the same structure.2. Why can a table have only one clustered index?When a table had a clustered

1. Download the latest version of the Mysql-5.7.12-winx64 portable version from the official website, unzip it to the directory that needs to be installed (mine is extracted in: D:\SW), the directory structure is as follows:2. Under this directory,

MySQL Stored procedure: Provides query statements and returns the number of rows affected by query executionDELIMITER $$DROP PROCEDURE IF EXISTS' P_get_select_row_number ' $$CREATE PROCEDURE' test_cases '. ' P_get_select_row_number '

MySQL data types include integer type, floating-point type, fixed-point number type, date and time type, string type, and binary data type. Different data types determine the data storage format, the valid range, and the corresponding restrictions.1,

MySQL Database optimizationI. SQL and index optimizationHow do I find the problematic SQL?Use the MySQL slow query log to monitor efficiency issues with SQLTo see if the slow query log is turned onShow variables like ' Slow_query_log '650)

Transferred from: http://www.cnblogs.com/exmyth/p/3303470.html14.1.1 Creating a stored procedureIn MySQL, the basic form of creating stored procedures is as follows: CREATE PROCEDURE sp_name ([proc_parameter[,...]]) [Characteristic ...]

First, the relevant concept of MySQL introduction Second, the configuration of MySQL under Windows Configuration steps Start, stop, and uninstall of MySQL service Third, the basic composition of MySQL script Iv. data

Backup Database errorCause: The monitoring server has a relatively high CPU load recently. (Cpu4 core, load 2.7 or so) is very strange, because the other server MySQL occupies not a lot of resources, so I first optimized the database configuration

Transferred from: http://www.cnblogs.com/ggjucheng/archive/2012/11/05/2754938.htmlSyntax for insertINSERT [Low_priority | DELAYED | High_priority] [IGNORE] [into] tbl_name [(col_name,...)] VALUES ({expr | DEFAULT},...), (...),... [on

A B database installation Just don't say it.Start A B Databaseexecute on A B databaseGrant Replication Slave on * * to ' repl ' @ ' 127.0.0.1 ' identified by ' 123456 ';Link DatabaseChange a Host my.cnf ConfigurationLog-bin=mysql-bin# Binary Logging

1, group BY, with order by NULL to avoid sorting, will be much faster;2, as far as possible without sub-query, with join substitution;3, as far as possible to filter more records of the conditions on the left;4. Do not use! =, or, expressions (such

The system was prompted to create the service successfully when the MySQL service was created, but the net start command prompt failed to start and a 1053 error was prompted in Services.mscOperating system: Windows7MySQL version:

Original link: http://www.orlion.ga/1147/Mysqli has an object-oriented style and a process-oriented style, a personal feeling or an object-oriented style is better (after all, object-oriented)1, Mysqli::_construct ()mysqli::__construct  ([ string 

One: Concept understanding:1.tid:transaction ID, which is the transaction ID number of the MySQL server. 2.gtid:global Transaction ID, global transaction ID, no two thing IDs are the same in the entire master-slave replication schema.3. The global

Installing the MySQL moduleNPM install MySQLDatabase PreparationMySQL server is located on the machine IP address is 192.168.0.108, login account with [email protected]Creating the test database in MySQLCreate a users table in the test

Environment: MySQL Sever 5.1 + MySQL command line toolProblem: MySQL command line loginSolve:command-line logon syntax:Mysql–u user name [–h host name or IP address]–p passwordNote: The user name is the user you logged in, the hostname or IP address

The new version of mysql sets up multi-thread master-slave Replication I. First, get Mysql-5.7.11-1.el6.x86_64.rpm-bundle.tar Tar xf mysql-5.7.11-1.el6.x86_64.rpm-bundle.tar Yum install-y mysql-community-client-5.7.11-1.el6.x86_64.rpm

Python & MySQLEnvironment: windows8 + Python2.7 + MySQL5.6I tried to embed the SQL language in C/C ++, and finally failed in its complicated "tedious" Environment configuration. Later I found that Python and MySQL are easier to implement, in Python,

Upgrade MySql to support emoji and utf8mb4 Some children's shoes do not have a deep understanding of Emoji expressions. They are reluctant to use Emoji and do not want to go to Baidu.Emoji is a character, not an image. If it is not supported by the