php order by rand

Author:flymorn Source: Easy to floatcategories:php Programming Posttime:2011-1-14 15:35:07Text: Recently, due to the need to study the MySQL random extraction implementation method. For example, to randomly extract a

Author:flymorn Source: Easy to floatcategories:php Programming Posttime:2011-1-14 15:35:07Text: Recently, due to the need to study the MySQL random extraction implementation method. For example, to randomly extract a

Original address: http://www.phpchina.com /? Action-viewnews-itemid-33727   This topic explains in detail MySQL Order By Rand () Efficiency The optimization solution and the optimization process are provided. It is a rare article about MySQL

The RAND () Optimization Method for MySQL optimization and the rand Method for mysql Optimization As we all know, in MySQL, if order by rand () is used directly, the efficiency is very poor because it will be executed multiple times. In fact, this

The general wording is: SELECT * from Content order by RAND () LIMIT 1."Drift Easy Note: 30,000 records query cost 0.3745 seconds (same below); from the MySQL slow query log, see" Order by RAND () "Full table scanned 2 times! 】 Then I looked up the

MySQL random query: MySQL Order by Rand () efficiency problem has always been a developer's frequently asked questions, we are not DBA, not so cow B, can only slowly study, recently due to project issues, need to probably study the MySQL random

Order by rand (), orderbyrand The random extraction Implementation Method of MYSQL needs to be roughly studied. For example, to randomly extract a record FROM the tablename table, the general syntax is: SELECT * FROM tablename order by rand () LIMIT

Recently, because of the need to study the MySQL random extraction implementation method. For example, to randomly extract a record from the TableName table, the general wording would be: SELECT * from TableName ORDER by RAND () LIMIT 1. But then I

Recently, we have studied the implementation of MYSQL 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.However, I checked the MYSQL

Recently because of the need to study the MySQL random extraction implementation method. For example, to randomly extract a record from the TableName table, the general wording would be: SELECT * from TableName ORDER by RAND () LIMIT 1. However, I