mysql query

The design of MySQL index can make your database fly, greatly improve the efficiency of the database. There are a few things to note when designing a MySQL index: 　1. Create an index Indexing is especially important for queries as a major

Program | optimization mastered Pear::benchmark, now that you know how to test your code, know how to determine if your code is fast or slow, which part is slower. So the next thing I want to say is how to eliminate or optimize that part of the slow

  This article illustrates how PHP uses the specified encoding to export MySQL data to a CSV file. Share to everyone for your reference. The implementation method is as follows: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Problem | optimization In a function, it is more efficient to use return than to use global when passing an array, for example: 　　 function Userloginfo ($usertemp) {$detail =explode ("|", $usertemp);return $detail;}$login =userloginfo ($USERDB); 　　

When a complex condition search occurs, the where somthing order by Somefield+somefieldmysql searches the database, finds the "all" qualifying records, and then takes out the M,n record. If you have hundreds of thousands of data, the user searches

As we all know, query optimization is an unavoidable topic in any database. For database engineers, optimization is the most challenging job. MySQL Open source database is no exception. In fact, the author believes that the database optimization is

MySQL is a leader in open source, and one of the fastest growing open source database developers in the world. As the world's most popular open source database software, the MySQL Enterprise Edition is the company's flagship product, including

What functions does MySQL use to execute MySQL statements Definitions and usage The mysql_query () function executes a MySQL query. Grammar mysql_query (query,connection) parameter description Query required. Specify the SQL query to send. Note:

The MySQL default character set of the system is not GBK, so the application of the database and the development of Chinese program bring great inconvenience, in the endless GBK and UTF8 of the conversion process consumes our countless energy and

The optimizations described in the previous section are implemented by a MySQL user with no privileges. The system administrator who can control the MySQL server or computer can perform additional optimization measures. For example, some server

When you submit a query, MySQL analyzes it to see if you can do some optimizations to make it faster to process the query. This section describes how the query optimizer works. If you want to know the optimization method used by MySQL, you can view

Most PHP developers are learning skills in an old-fashioned way. They usually learn how to define and build simple PHP pages, and then learn how to connect these pages to a simple MySQL table, so you can develop your own. As the skill level

  Random data selection from MySQL is also one of our most common hair, and the easiest way to do this is to use "ORDER by rand ()", which describes 4 methods of obtaining random data, including order by Rand (), and analyzes their pros and cons.

This article is mainly from the principles, manuals and source analysis in PHP query MySQL return a large number of results, memory footprint problem, while the use of the MySQL C API also involved. Yesterday, a colleague in the PHP discussion

One, MySQL GUI Tools MySQL official provides a visual interface to the MySQL database management console, provides four graphical applications, these graphical management tools can greatly improve database management, backup, migration and query

mysql| Pagination | Optimization Author: steeven It seems that few people are talking about paging, are we all addicted to limit m,n? In the case of indexing, limit m,n speed is sufficient, but when searching for complex conditions, where somthing

Querying case-insensitive data in MySQL often uses subqueries and uses the upper function in a subquery to convert the condition to uppercase. Such as: The code is as follows:SELECT * FROM Staticcatalogue WHERE UPPER (source) in (select UPPER

MySQL is a synonym for Easy-to-use databases, and most database-driven Web applications use MySQL as their preferred database, so MySQL is used on many Web servers. Although the MySQL command statement tool is useful, it can take a considerable

Recently, there have been a lot of questions about support forums about how to make a link like "Back 1 2 3 4 5 forward" for a search result. I hope the following script will help you to add this functionality to your search results page. This

Java Server page (JSP), like ASP and PHP, is a network programming language, except that the scripting code inserted in a JSP page is a fragment of a Java statement. To use JSP to write an application, first of all, must have a Web server that can