MySQL

Example 1: stored procedure without ParametersCopy codeThe Code is as follows:$ Conn = mysql_connect ('localhost', 'root', 'root') or die ("data connection Error !!! ");Mysql_select_db ('test', $ conn );$ SQL ="Create procedure myproce ()BeginInsert

The positioning result is as follows: Customer environment:Windows server 2003 r2 standard edition sp2Mysql Ver 14.12 Distrib 5.0.18, for Win32 (ia32)In apache 2.2RisingWebshield client 1.08 The problem has been reproduced. It can be optimized. It

The problem is as follows:The persons table has two fields: id and name.The content in the document persons.txt (tabs are used to separate fields in each line ):1 Bush2 Carter3 BushUse load data local infile into persons.txt "into table persons in

The memory table is a table in the memory. The size of the memory used can be calculated by using My. specify max_heap_table_size in cnf. For example, max_heap_table_size = 1024 M. The memory table is different from the temporary table. The

1. index creation time: it is worthwhile to create an index for a field in select, filter, and sort conditions.2. For Fuzzy queries like '% XXX', normal indexes cannot be satisfied, and full-text indexes must be created.3. if there are multiple

The time format is 2013-03-12.Query the data of the current day:Copy codeThe Code is as follows:SELECT * FROM 'table' WHERE date (time field) = curdate ();Query the current month field:Copy codeThe Code is as follows:SELECT *FROM 'table'WHERE month (

1. Create the path to save the mysql backup file/mysqldata# Mkdir/mysqldata2. Create the/usr/sbin/bakmysql file.# Nano/usr/sbin/bakmysqlInput:Copy codeThe Code is as follows:#! /Bin/shName = 'date + % Y % m % d'Mysqldump -- all-databases-uroot-p

Perform a detailed analysis on mysql Query Cache from five perspectives: Query Cache working principle, how to configure, how to maintain, how to determine the Query Cache performance, and suitable business scenario analysis. Working Principle The

1. query help? Contents2. Use the merged hash value to separate BLOB or TEXT3. Number of points used for currency (decimal or numberic)4. SQL _mode?5. order by rand () limit 1000;6. Optimize show status like 'com' Com_select Com_insert and so on to

In Navicat for MySQL, PostgreSQL and OracleThe error occurs because the mysql account does not have sufficient permissions to connect to the remote mysql server.After mysql is installed, only "localhost" connections are allowed by default. Therefore,

ACID: Atomic, Consistent, Isolated, DurableA storage program provides an excellent mechanism to define, encapsulate, and manage transactions.1. MySQL transaction support 1) MySQL transaction support is not bound to the MySQL server itself, but

Having usage Having clauses allow us to filter various data After grouping. where clauses filter records before aggregation, that is, before group by and having clauses. The having clause filters group records after aggregation.SQL instance:1.

Assume that we have two tables. One Table stores Product information for the Product table, with the Product Price column Price. The other table is the ProductPrice table, update the Price field in the ProductPrice table to 80% of the Price field in

I started to learn about databases today. Because I don't catch a cold with Microsoft, I don't need to use his products. I wanted to install ORACLE, but it was too big, I am afraid that MySQL is a good choice for people like me who like everything

ERROR 1130 (HY000): Host 'localhost' is not allowed to connect to this MySQL server www.jb51.netCause:Mysql only has one root user. After changing the root password, select MD5. After submission, click"Host 'localhost' is not allowed to connect to

There are two main methods to process MYSQL transactions.1. Use begin, rollback, and commit to implement Start a transactionRollback transaction rollbackCommit transaction validation2. directly use set to change the mysql automatic submission Mode

Preface: Recently, Oracle MySQL posted some of the 5.6 posts on its official BlogModify the default value of a Variable. WhereInnodb_old_blocks_timeFrom 0 to 1000 (1 s) The role of this parameter is as follows: How long in milliseconds (MS) a

After logging on to mysql by defaultYou can use the show variables statement to view system VARIABLES and their values. Mysql> show variables like '% character % '; (The following is in the CentOS-6.2 settings)(Different versions may have some

1. You want to operate the mysql server at the command prompt and add system variables. (Computer-System Properties -- environment variable -- path)2. query data in a data table;Select selection_list select */columnsFrom table_list from table1/table2

Environment: Debian 6.02 (squeeze) x64Software: MySQL 5.5.14Steps:1. upgrade the system# Apt-get update# Apt-get upgrade# Apt-get install chkconfig libpcre3-dev build-essential libssl-dev libncurses5-dev (bison)2. Prepare SoftwareCmake-2.8.5, mysql 5