MySQL

Mysql: how to perform recursive hierarchical queries is a migration from the oracle database to the mysql database recently, in Oracle, we know that there is a Hierarchical Queries. Using connect by, we can easily query all the subnodes under all

MySQL table names/column names are case sensitive. in MySQL, databases and table pairs are stored in directories and files under those directories. Therefore, the sensitivity of the operating system determines the case sensitivity of the database

In MySql, IFNULL, NULLIF, and ISNULL are used in MySql to find that isnull in mysql is a little different from that in MSSQL. Now, let's briefly summarize: isnull and ifnull in MySql, the usage of nullif is as follows: www.2cto.com isnull (expr): If

In MySQL, The TIMESTAMPDIFF and TIMESTAMPADD functions are often used in applications. 1. TIMESTAMPDIFF Syntax: TIMESTAMPDIFF (interval, datetime_expr1, datetime_expr2 ). Note: www.2cto.com returns the integer difference between the datetime_expr1

Example of LAST_INSERT_ID usage of MySQL environment: MySQL Sever 5.1 + MySQL command line tool first let's look at an example (the primary key is auto-incrementing): [SQL] mysql> insert into bankaccount (name, balance) values ('20140901', 123);

Mysql cluster 7.2 + 5.5 CREATE a disk TABLE and a memory TABLE creating a memory TABLE and a disk TABLE on a mysql cluster: create table 'city' ('id' int (11) on www.2cto.com) not null auto_increment, 'name' char (35) not null default '',

SQL statement for MySQL to CREATE tables regularly -- view the event plan SELECT @ event_scheduler -- open the event plan www.2cto.com SET GLOBAL event_scheduler = 1 -- stored PROCEDURE, CREATE a table CREATE PROCEDURE create_table () every month ()

Understanding mysql locks (1) Overview of locks compared with other databases, MySQL locks are relatively simple. The most notable feature is that different memory engines support different locks, however, mysql memory engines use three types of

Mysql (1) Installation of mysql 1. Installation of Mysql 2. Installation of mysqldata Library first download of mysqlinstallation package mysql-5.0.85.tar.tarUpload the downloaded installation package to the/usr/sid/mysql directory of Linux and

Windows 7 command line MySQL Chinese garbled problem because Win7 command line window uses GBK encoding, and MySQL Server encoding is set to utf8, by default, Chinese characters are displayed with garbled characters www.2cto.com. The solution can be

Mysql (8) index-related links: Mysql (1) mysql installation http://www.bkjia.com/database/210210/162314.html#mysql( 2) database-related operations (3) actions on Data Tables http://www.bkjia.com/database/201210/162316.html#mysql( 4) Actions on data

Mysql-related things (9) commonly used function links: Mysql-related things (1) mysql Installation http://www.bkjia.com/database/201210/162314.html Mysql (2) Database Operations http://www.bkjia.com/database/201210/162315.html Mysql (3) operations

Mysql Chinese garbled detailed solution this is my previous iteye number, now put in this number, easy to sort out recently to do the graduation design, the previous database is oracle, basically, no Chinese garbled characters have been found.

MYSQL Service removal summary System Environment Information 1 CentOS release 6.3 (Final) 2 VMware®Workstation 9.0.0 build-812388 www.2cto.com MYSQL unload 1 view historical installation information # rpm-qa | grep-I mysqlmysql-libs-5.1.61-4.el6.i686

Mysql development encounters garbled issues 1. mysql encounters garbled code www.2cto.com solution: show variables like 'collation _ % '; check whether the encoding is the same as the encoding of data in the program. If not, there are two

Back up mysql and website scripts in windows the latest database and website backup script in windows: www.2cto.com set today = % date :~ 0, 4%-% date :~ 5, 2%-% date :~ 8, 2% for/f % I in ('dir d: \ wamp \ bin \ mysql \ mysql5.5.20 \ data/ad/B ')

Mysql reinstallation failure solution I believe that everyone has had the experience of reinstalling MySQL. If you reinstall MySQL, it is basically not in the last step, unless you reinstall the operating system, the reason is that the registry in

The MySQL command under Fedora is described in detail first. I am also just learning MySQL. If something is wrong, please correct me and hope that I can help you with some experience. The following describes my installation: www.2cto.com 1. My

MYSQL entry 2 _ PHP operation MYSQL 1. Connect to MySQL locally www.2cto.com $ con = mysql_connect ("localhost", "root", "xxxxxx"); if (! $ Con) {die ('could not connect :'. mysql_error ();} else {echo "Connect success \ n";} 2. SAE connects to

MYSQL implementation method of random query MYSQL implementation method of random extraction. For example, to randomly extract a record FROM the tablename table, the general syntax is: SELECT * FROM tablename order by rand () LIMIT 1. Www.2cto.com,