MySQL

The first is to install the MySQL database. Installation is complete using the sudo apt-get install mysql-server command. The table is then created and the data is inserted:Then download the Sqoop and the jar package that connects to the MySQL

The formula is as follows, Unit meter: 1th Latitude: lng1 lat1 2nd latitude and Longitude: lng2 lat2round (6378.138*2*asin (Pow ((sqrt () LAT1*PI (180)/2), 2) + Cos (LAT1*PI ()/180) *cos (LAT2*PI ()/180) *Pow (Sin ((Lng1*pi ()/180-lng2*pi ()/180)/2),

Metadata: Data, information that describes the data is also data, called metadata[MySQL] How to get metadataMySQL provides the following three ways to get the metadata for a database object: 1) Show Statement 2) query the related table from the

From:http://www.cnblogs.com/lynch_world/archive/2012/01/06/2314717.htmlubuntu under Installation Apache+php+mysqlReprinted from: http://www.comflag.com/2011/05/01/apache-web.htmIn the movie "Social Network", Facebook founder Mark Zack broke into the

I. Description of the BusinessUsing HADOOP2 and other open source frameworks, the local log files are processed and the data required after processing (PV, UV ... Re-import into the relational database (MYSQL), using Java programs to process the

Original address: http://www.cnblogs.com/qiyebao/p/3887055.html1. First go to http://dev.mysql.com/. Download the Windows edition mysql5.6 free install ZIP package. Then extract the zip package to D:\mysql-5.6.20-winx64.2. Copy the My-default.ini

In the program, if you want to dynamically get the specific information of a table, you use the INFORMATION_SCHEMA information database in MySQL, and it contains many tables, see below: INFORMATION_SCHEMA SCHEMATA表INFORMATION_SCHEMA

After MySQL version 3.23.44, the InnoDB Engine type table supports foreign KEY constraints.Use conditions for foreign keys:1. Two tables must be a InnoDB table, the MyISAM table temporarily does not support foreign keys (it is said that later

Structure of library borrowing information bank Use Day14;drop table student;drop table Book;drop table borrow;--1. Creating Student table information CREATE TABLE student (Stuid CHAR (PRIMARY) KEY, Stuname varchar (TEN), major varchar (50));

Originally to write a document, the middle of the program to determine whether a column exists, does not exist to add, there is no processing directly display a result can be, write the program as follows:if exists (SELECT * FROM

Official website: http://dev.mysql.com/downloads/mysql-proxyLearning version: mysql-proxy-0.8.5-1.el6.x86_64 Environment Preparation: mysql_a(10.0.13-mariadb) Read and write :n1.test.com;172.16.2.11 Mysql_b ( 10.0.13-mariadb) Read only: n2.test.com;

Case Combing time: 2013-9-25 written in the previous words: In slow-scan optimization 1 and 2 have repeatedly emphasized the importance of explain, but sometimes the naked eye can not see how the explain Results to guide optimization,

One, MySQL login errorMysqladmin:connect to server at ' localhost ' failedError: ' Access denied for user ' root ' @ ' localhost ' (using Password:yes) 'Workaround: Hack the MySQL password#> Service mysqld Stop#>mysqld_safe--skip-grant-tables &Enter

SQL optimization solution for querying duplicate data in mysql, mysqlsql When querying non-case-insensitive data in mysql, subqueries are often used, and the upper function is used in subqueries to convert conditions into uppercase. For example:

Several issues related to NULL values in MySQL Databases For SQL beginners, the concept of NULL value is often confusing. They often think that NULL is the same as the NULL String. This is not the case. For example, the following statements are

Use special MySQL operators to obtain more data comparison functions If you have recently performed SELECT or UPDATE queries, you may have used one or more MySQL comparison operators to limit the query output results. Comparison is an integral part

How to Use Redis SORT sorting commands I believe that you do not know much about Redis SORT sorting commands. Therefore, I have compiled some methods and examples of using Redis SORT sorting commands. I hope the examples can help you. Redis SORT is

Command Line is not an internal or external command troubleshooting method, mysql external command First, make sure that you have not changed the installation directory of MySQL.IfYou renamed or changed your pathTo change your path in the

[MySQL-1] mysql error 1101 blob/text column can't have a default value, mysql-1blobCreate a field containing the TEXT type on MySQL Query Browser. If the creation is unsuccessful, the following error occurs: mysql error 1101 blob/text column can't

In CentOS, php cannot connect to mysql using 127.0.0.1. centosmysql Php code is simple: Copy codeThe Code is as follows:$ Server = "127.0.0.1 ";Println ("Begin ");$ Link = mysql_connect ($ server, "mysql", "mysql ");If (! $ Link ){Die ('could not