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The RAND () Optimization Method for MySQL optimization and the rand Method for mysql Optimization

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

Mt_rand of random functions in PHP () and Rand () performance comparison and analysis _php skills

This paper compares and analyzes the performance problem of random function Mt_rand () and Rand () in PHP. Share to everyone for your reference. The specific analysis is as follows: The Mt_rand () and Rand () functions in PHP can randomly generate

MySQL optimization-RAND () optimization method _ MySQL

This article mainly introduces the RAND () optimization method for MySQL optimization. This article analyzes several optimization methods for RAND () in Mysql in detail, and finally draws a conclusion, if you want to directly order by rand () in

MySQL RAND () optimization case analysis, mysqlrand

MySQL RAND () optimization case analysis, mysqlrand 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 is also true if the equivalent query uses RAND (

Case Study of RAND () optimization in MySQL _ MySQL

This article mainly introduces the RAND () optimization cases in MySQL, including the optimization of JOIN queries and subqueries. For more information, see MySQL, if order by rand () is used directly, the efficiency is very poor because it will be

[MySQL optimization case] series-RAND () Optimization _ MySQL

[MySQL optimization case] series-RAND () optimization we all know that in MySQL, if order by rand () is used directly, the efficiency is very poor because it will be executed multiple times. In fact, this is also true if the equivalent query uses

The rand () Optimization case analysis _mysql under Mysql

As we all know, in MySQL, if direct order by RAND (), the efficiency is very poor, because it will be executed multiple times. In fact, if the equivalent query is also in RAND (), let's take a look at the different execution plans and execution time

Mysql random RAND and group by optimization

I recently saw an article about mysql optimization. I would like to record and share the optimization methods used in two of them.Group by optimizationSELECT goods_id, count (*) FROM t group by goods_id;BY default, MySQL applies to all group by col1,

[MySQL optimization case] series-rand () optimization

As we all know, in MySQL, if the direct ORDER by RAND (), the efficiency is very poor, because it will be executed multiple times. In fact, if the equivalent query is also used with RAND (), let's take a look at the different execution plans and

Optimization method for Rand (_MYSQL) for Mysql optimization

As we all know, in MySQL, if direct order by RAND (), the efficiency is very poor, because it will be executed multiple times. In fact, if the equivalent query is also in RAND (), let's take a look at the different execution plans and execution time

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