MySQL

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We've seen MySQL's like pattern matching and ... % MySQL supports another type of pattern-matching operation based on regular expressions and regexp operators. If you know PHP or Perl, it's very simple, because these scripts have very similar

command requirements for creating tables: The name of the table table field Name Definition of each field Grammar: The following is a common SQL syntax to create a MySQL table: CREATE TABLE table_name (column_name column_type); Now, we will

Sample database: CREATE TABLE Shop (Article INT (4) UNSIGNED zerofill DEFAULT ' 0000 ' not NULL,Dealer CHAR DEFAULT ' not NULL,Price DOUBLE (16,2) DEFAULT ' 0.00 ' is not NULL,PRIMARY KEY (article, dealer)); INSERT into Shop VALUES(1, ' a ', 3.45),

Usually there is a field in the table that creates date, and other databases have the option of default values. MySQL also has a default value of timestamp, but in MySQL, not only is the insertion of the modification will also update the value of

CONCAT (STR1,STR2,...) MethodCONCAT (STR1,STR2,...) DescriptionReturns a string resulting from a connection parameter. If any of the arguments are null, the return value is null. If all parameters are non binary strings, the result is a non binary

Inquire:In a select query, another select query is nested. One is the outer query and the other is the inner query.where child query That is, the WHERE query statement has a SELECT statement that treats the results of the inner query as the

MySQL master-Slave synchronization backup steps under Windows 2003 System A: Master serverIP Address: 192.168.1.124B: From the serverIP Address: 192.168.1.125Prerequisite: Please keep the data of two databases the same before setting the

A MySQL error was suddenly encountered: Error (HY000): File '/var/www/xiaoyou/static/upload/import/20130427105733.csv.txt ' not Found (Errcode: 13) The feeling is very strange, because the program in the local very OK, angry statement as follows:

MySQL Database security solutionThe account is the simplest security measure for MySQL. Each account consists of a user name, a password, and a location (typically a server name, IP, or wildcard character). If user John logs on from Server1, it may

MySQL tutorial optimization of the first step should be to troubleshoot problems, to find bottlenecks, and usually the bottleneck and problems need to observe the operation of MySQL to analyze, "view the MySQL health" This article lists some

1, to optimize the table 2, Analysis of the table (analysis and storage of MyISAM and BDB table in the distribution of keys) 3, check the table (check the table error, and update the key for the MyISAM statistics) 4, repair the table (repair the

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Why MySQL is used? Because MySQL is small and exquisite and has powerful performance. Regardless of the capacity, compared to the other two (SQL server, oracle), it is just a few G, dozens of G big software installed on the computer, to use smoothly,

The first step of MySQL optimization is from MySQLTuner.MySQLTuner official website: http://mysqltuner.com/Download MySQLTuner# Wget http://mysqltuner.pl/-O mysqltuner. plExecute MySQLTuner# Perl mysqltuner. pl> MySQLTuner 1.6.5-Major Hayden> Bug

I have mentioned in other articles that the company's database uses the free installation version and is on Windows. After a while, I will migrate the database to Linux.Due to the large number of databases developed and operated by the company, if

First, find the MySQL configuration file my. cnf. The configuration for enabling slow queries varies with mysql versions.For mysql 5.0[Mysqld]Long_query_time = 1Log-slow-queries =/var/log/mysql/slow. logFor mysql 5.1[Mysqld]Long_query_time =