MySQL

The parameters of the Group_concat () function can be sorted directly by using order by. 666.. Here is an example to illustrate, first look at the following T1 table. For example, we want to look at multiple scores for each person and show the

The Union and order by in MySQL can be used together, but some minor problems need to be noticed in use, as illustrated by the examples below. First look at the T1 table below. 1, if directly with the following SQL statement will be an error:

MySQL 5.7 version of the installation using a detailed tutorial Write or more detailed, even some cumbersome, there are many steps in the other tutorial documents are omitted, but I still have to write out, because I went a lot of detours, I hope

Solve the problem that the Chinese garbled under MySQL is all question mark is also a headache of Chinese garbled problem, just start I have been using the local database test, this is no problem ah, not a problem, but I forget the Android and the

Before using the MySQL 5.5 Command line client, No matter what password you enter, there is a flash-back situation, and then find data found before the original use of 360, the MySQL service to shut down, the solution is summarized as follows: 1.

MySQL Login Problem Solving method MySQL before the use of good, but today after the launch of MySQL entered the password appears in the Flash back, in Task manager found that the MySQL service did not start, when manually started when prompted to

3.0 injection of MySQL The injection of MySQL is mainly by union query, but the union is only version 4. More than 0 of the useful, to 3. It's useless to be under 0 ... So there's no way to use Union for cross table queries in MySQL 3.0 database,

Also said need to copy to System32 below, a look is crooked strokes. Finally found someone said to the "PHPRC" environment variable problem! Probably because of it ... According to my understanding (the first time with php[may be the second time),

if (GET_MAGIC_QUOTES_GPC () ==1) { ?> mysql General Query Procedure Note that this program needs to have the PHP configuration file (PHP3 PHP3.INI,PHP4 as PHP.ini) in the MAGIC_QUOTES_GPC Set to OFF or 0, please reboot Apache after modification.

Test system Environment Windows 2003 python 2.5.1 MySQL 5.0.1Should only apply to win because the CMD is invoked.Incremental backups, because the database is small.Back with the need to add self-test, 5 days before the automatic

There are many online Windows MySQL automatic backup method, but really can not use a few, some say is still very complex, difficult to operate. We all know that MSSQL itself with a scheduled task can be used to automatically back up, but MySQL

Mysql-5.6.14-win32 for the installation of uncompressed version, installation version (http://dev.mysql.com/downloads/installer/5.5.html) there are many drawbacks. The MySQL 5.6.14 Win7 32-bit version-free configuration method is shown below: 1.

The test process is as follows: CREATE TABLE Sales As SELECT * from Sh.sales; CREATE TABLE Customers As SELECT * from Sh.customers; Create unique index Cust_id_un on customers (cust_id); Create: Bitmap Join Indexes Create Bitmap Index

Create a new LVM disk, here I built the LV for MYDATALV, mounted to the/data under the [Root@localhost ~]# LVs LV VG Attr lsize Pool Origin data% meta% move Log cpy%sync Convert mydatalv m Ydata-wi-ao----1.0

In a class Nuix system, the location of the configuration file is generally/etc/my.cnf or/etc/mysql/my.cnf We've seen some people try to modify the configuration file but not take effect because they are not modifying the files that the server

To create a test table: DROP TABLE IF EXISTS ' test '; CREATE TABLE ' test ' ( ' year ' int ') default null, ' month ' int (one) default null, ' amount ' double default null) Engine=innodb DEFAULT Charset=utf8; Insert data:

Error 1819 (HY000): Your password does not satisfy the current policy requirements, what happens to this problem? Don't worry, here's the answer. In order to enhance security, MySQL5.7 generated a random password for the root user, in the error log,

Recently used the framework to do a few projects, feeling that the bottom of the things a bit forgotten, write a JDBC Simple connection code to familiarize yourself with the review, but also hope that the new contact to help the novice. This is also

mysql5.7.9 version above on the WINDWOS installation will encounter the problem is not started but there is no error, because the version of 5.7.9 above in the MySQL directory will be missing the data directory: The data directory is stored in a

Note Some of the tips for select: 1. Select statements can be separated by carriage returns $sql = "SELECT * from article where id=1" and $sql = "SELECT * FROM article Where id=1 can get the right results, but sometimes it may be clearer to write