if statement in php mysql query

High Performance MySQL Reading Notes-query performance optimization, high performance mysql For high-performance database operations, it is not enough to design the optimal database table structure and build the best index. You also need to design

MySQL Format statement specificationHow do I log into your database?Example!If you are compiling the installation of the flowers, then you have to compile the installation of the directory to go, my is installed into the/usr/local/mysql database: Cd/

First, IntroductionNginx is a very lightweight HTTP server written by the Russians, Nginx, which is pronounced "engine X" and is a high-performance HTTP and reverse proxy server, as well as a IMAP/POP3/SMTP proxy server. Nginx was developed by the

Original works of Lin Bingwen Evankaka. Reprinted please indicate the source http: blogcsdnnetevankaka 1. user creation, permission, and deletion 1. connect to MySql Connection: mysql-h host address-u user name-p user password (note: u and root do

What is an API?An application interface (application programming interface abbreviation) that defines the classes, methods, functions, variables, and so on everything in your application that needs to be called in order to complete a particular task.

MySQL常用指令，java，php程序员，数据库工程师必备。程序员小冰常用资料整理MySQL common commands (for reference)The most common display commands are:1. Display the list of databases.show databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

Two ideas for improving Orderby statement query efficiency in mysql Analysis of two ways to improve the query efficiency of Order by statements in mysql _ MySQL Because the database records may need to be reordered. In this article, I will talk

For high-performance database operation, it is not enough to design the optimal library table structure, and to establish the best index, but also need reasonable design query. If the query is poorly written, high performance cannot be achieved even

Compare the buffer query and no buffer query of MySQL in PHP, phpmysql About cache query and unbuffered QueryThe MySQL client has two types of queries:Buffer query:The query results will be received and stored in the client cache, And the next

MySQL basic query statement learning notes, MySQL statement learning notes 1. Basic query statementSelect attribute list from Table Name and View list [where condition expression 1] [group by attribute name 1 [having condition expression 2] [order