MySQL

PHP obtains the MySQL float field. After ECHO is output, the fractional part contains multiple 0. You can use floatval ($ num) to remove 0. To retain decimal places, use number_format ($ num, 2 ); The number_format function rounds the value that

Login In cmd: > Mysql.exe-uroot-P > Enter password :******** > Mysql>   It's like this: Mysql-uusername-ppassword-hhost Attention: There is no blank after the parameters:-u,-P,-H   The mysql client program, also known as the

Since I decided to take an postgraduate entrance exam, I haven't written anything in my blog for a long time. Now, I am very satisfied with my score. The review notification of nudt has not yet come down. I changed the question when I handed in

How can we view the MySQL storage engine accurately? Here are two correct methods. 1) Correct Method 1: Show table status from database name where name = 'table name' 2) mysqlshow-u database Logon account-P Sometimes, we want to see the

Pgsql Syntax to_number (text, text) Example: Select to_number (TRIM (both 'ibs 'from classname), '000000') as CN from BBS order by CN/* trim (both 'ibs' from classname) remove the 'ibs 'character in the classname field */ MySQL Syntax Str *

Tungsten Multi Replication Brief IntroductionTunsten provides a multi-master replication method similar to xtradb cluster. Its core idea is that multiple masters maintain one copy of data at the same time.Xtradb cluster maintains a circular

A trigger is an event that triggers an operation. These events include insert statements, update statements, and delete statements.   Create a trigger to create a trigger with only one execution statement Create TriggerTrigger name before|After

Join query connects two or more tables according to a certain condition and selects the required data. When different tables have fields of the same meaning, you can use these fields to connect these tables. Reference Table: Employee

ArticleSource: http://www.centos.bz/2011/04/reset-mysql-root-password/ Follow these steps to reset the password of the MySQL database server. Step 1: Stop the MySQL server. Step 2: Use-Skip-grant-tables to select to start the mysqld process to

[Intrinsic column flags] (basic field type identifier) -PK: Primary Key (column is part of a PK) primary key-NN: not null (column is nullable) non-null-uq: Unique (column is part of a unique key) unique-AI: auto increment (the column is auto

Original path: http://www.cnblogs.com/xiaochaohuashengmi/archive/2011/10/18/2216087.html Install Rpm-IVH MySQL-server-4.1.22-0.glibc23.i386.rpm -- nodeps Rpm-IVH MySQL-client-4.1.22-0.glibc23.i386.rpm -- nodeps Check whetherInstallNetstat-atln

A subquery is a nested query statement in another query statement. Query results of the inner query statement, which can provide query conditions for the outer query statement In certain circumstances, the conditions of one query statement must

From: http://blog.csdn.net/mzlqh/article/details/7621307 Uninstall MySQL Step 1   1 Sudo Apt-Get autoremove -- purge mysql-server-5.0 2 Sudo Apt-Get remove mysql-Server 3

Absolute value functions ABS (X) and circumference rate functions Pi () MySQL > Select ABS ( 0.5 ), ABS ( - 0.5 ), Pi (); + -- -------- + ----------- + ---------- + | ABS (0.5 ) | ABS ( - 0.5 ) | Pi () | + -- -------- + ----------

The system information function is used to query the system information of the MySQL database. Version () returns the database version number. MySQL > Select Version (); + -- ----------------------- + | Version () | + -- -------------------

Prepare software: 1. j2sdk (1.5.0): jdk-1_5_0-linux-i586-rpm.bin 2. Apache (2.0.53): httpd-2.0.53.tar.gz 3. resin (3.0.13): resin-3.0.13.tar.gz 4. MySQL (4.1.12): SERVER: MySQL-server-4.1.12-1.i386.rpm Client:

From: http://www.thegeekstuff.com/2008/07/howto-install-mysql-on-linux/   Howto install MySQL on LinuxBy Ramesh natarajan on July 6, 2008 sharethis   Most of the Linux distro comes with MySQL. if you want use MySQL, my recommendation is that

What is a view? A view is a table imported from one or more tables. It is a virtual table. A view is like a window in which you can view the data provided by the system. In this way, you don't need to see the data in the entire database, but care

Balanced data The fixed-length or variable-length string can be used for string type data. The difference is that a string of the fixed length is filled with spaces to the right to ensure the same number of bytes. The variable-length string does not

1. Connect to MYSQL.Format: mysql-h host address-u user name-p User Password1. Connect to MYSQL on the local machine.First, open the DOS window, enter the mysql \ bin directory, type the mysql-u root-p command, and press enter to prompt you to enter