MySQL

Abstract: This article describes the knowledge about string pattern matching. Standard SQL mode matching is the standard of SQL language and can be accepted by other relational database systems. Extended regular expression pattern matching is

Using MySQL for database backup has a very regular database backup method, which has the same concept as other database servers, but have you ever thought about it, mySQL will have a simpler backup method using the file directory, and it will be

Mysql cross-Table update assumes 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

Mysql basics: column type-integer MySQL supports multiple column types: value type, date/time type, and string (character) type description: · M represents the maximum display width. The maximum valid display width is 255. · D is applicable to

Configure bare devices for Linux UDEV and MySQL InnoDB shared tablespaces (1) UDEV basic udev can manage files stored in the/dev directory. Files are generated only after the device is connected. automatic deletion also allows you to add rules to

MySQL learning footprint record 01-SOURCE, SHOW 1. Import Data command: SOURCE ; eg: mysql> source ~/MyDoc/create.sql;  2. the shortcut for show columns from is DESCRIBE eg: mysql> SHOW COLUMNS FROM orders;+------------+----------+-----

MYSQL: comma-separated string tables, which are broken down into vertical tables. [SQL] drop temporary table if exists Temp_Num; create temporary table Temp_Num (xh int primary key); -- CREATE a Number Auxiliary table set @ I = 0; INSERT INTO

How to enable Innode engine monitoring to view information about the current InnoDB Engine Mysql> show innodb status \ G  Enable InnoDB monitoring in four ways: 1. innodb_monitormysql> create table innodb_monitor (x int) engine = innodb; 2.

Use mysql _ case when to replace strings. Use case when to replace strings. 03 mysql> select * from sales; 04 + ----- + ------------ + -------- + ------ + ------------ + 05 | num | name | winter | spring | summer | fall | category | 06 + ----- + ----

MySQL query repeated records in the table (1) 1. Search for redundant duplicate records in the Table. Repeat records determine the select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count (peopleId)> 1) 2.

Mysql Query type conversion is not recommended for mysql query, such as converting varchar to int Mysql> explain select * from user where name = 1 \ G  // If you are sure that the name field is an integer, do not convert it into a string without

Interaction with mysql in shell script 1: [Plain] mysqlCMD = "mysql-h $ {MYSQL_HOST}-P $ {MYSQL_PORT}-u $ {MYSQL_USER}-p $ {MYSQL_PASS}" create_table_ SQL = "CREATE TABLE IF NOT EXISTS $ {MYSQL_DB_NAME }. $ {access_table_name} (id INT (10) not null

Mysql5.1 green version installation tutorial and mysql-related commands (solve mysqld-nt is not successful) prepare this file, and most of the tutorials are still using the mysql-nt command. The following describes how to install mysql5.1

How to view mysql version 1: mysql-V at the terminal. The following code snippet: [shengting @ login ~] $ Mysql-Vmysql Ver 14.7 Distrib 4.1.10a, for redhat-linux-gnu (i686) 2: in mysql: mysql> status; the following code snippet: mysql> status; ------

Mysql Backup Recovery (view, stored procedure) was recently found during the backup restoration of mysql, view restore error, unable to create view, found the information online, find the following information: 1. If the backed up database contains

Change the names of Mysql database tables to uppercase in batches [SQL] DELIMITER // DROP PROCEDURE IF EXISTS uppercase // CREATE PROCEDURE uppercase (IN dbname VARCHAR (200) BEGIN DECLARE done INT DEFAULT 0; DECLARE oldname VARCHAR (200 ); DECLARE

Simple mysql Data Operations 01 mysql-uroot-partition tablename04alter table add fieldname fieldtype05alter table table1 add id int unsigned not Null partition primary key06alter table TN chang 1_newfieldname fieletyep null or not partition table

MySQL does not support INTERSECT and MINUS and their alternative methods. Doing INTERSECT and MINUS in MySQL Doing an INTERSECTAn INTERSECT is simply an inner join where we compare the tuples of one table with those of the other, and select those

Some comparisons between Myisam and Innodb of MySQL summarize some differences between Myisam and Innodb engines of MySQL. First, the two are in the file structure: Myisam will store three files :. frm storage table structure ,. MYD Stores Table

How to solve the problem of max_allowed_packet error when importing data in MySQL 5.1 when the information package is too large: 1153-Got a packet bigger than 'max _ allowed_packet 'bytes terminates data import. When the MySQL client or mysqld