Article Introduction：The differences between first-level energy efficiency and second-level energy efficiency refrigerators are energy efficiency level, energy saving degree, price, service life and environmental protection performance. Detailed introduction: 1. Energy efficiency level. The energy efficiency level of a first-level energy-efficiency refrigerator is above 3.5, which means that the energy-saving effect of the refrigerator is very good. It can better realize the cooling and heat preservation functions during operation and reduce energy consumption. The energy efficiency of a second-level energy-efficiency refrigerator The level is between 3.2-3.49, and the energy-saving effect is relatively good, but there is still a certain gap compared with the first-level energy-efficiency refrigerator; 2. Energy-saving degree, the energy-efficiency level directly determines the energy-saving degree of the refrigerator, etc.

2023-09-11 comment 0  3927

Article Introduction：The efficiency of an internal combustion engine usually refers to the ratio of fuel energy converted into useful work, also known as thermal efficiency. The thermal efficiency of traditional gasoline and diesel internal combustion engines is generally between 20% and 40%. The efficiency of an internal combustion engine depends on multiple factors, including internal losses. , combustion efficiency and working cycle, etc.

2023-09-07 comment 0  4069

Article Introduction：Oracle is currently the leader in the field of enterprise-level databases. Its powerful security and stability provide reliable guarantee for enterprise-level businesses. In enterprise-level applications, query efficiency is one of the key indicators of database performance. This article will analyze and optimize Oracle's query efficiency from the following three aspects. 1. Index optimization Index is one of the important ways for Oracle to improve query efficiency. Query efficiency can be greatly improved through index optimization of the database. Index optimization needs to consider the following aspects: 1. Index selection When selecting an index, you need to determine

2023-05-18 comment 0  1006

Article Introduction：As an important tool to improve work efficiency, the DingTalk Productivity Suite has been favored by the majority of users. However, for first-time users of DingTalk, they may be a little confused: Where is the DingTalk Productivity Suite? Today, we will answer this question for you and help you find the DingTalk efficiency kit easily. How to view DingTalk Productivity Suite 1. First open the DingTalk APP on your mobile phone. 2. Then find the lower right corner (My) on the DingTalk homepage and click Settings. 3. Finally, you can view the efficiency package in DingTalk settings.

2024-07-02 comment 0  385

Article Introduction：How to improve work efficiency: How to improve work efficiency Analysis of strange PHP reference efficiency issues: The function is as follows: Copy the code The code is as follows: function update_timelist(&$arr,$timestamp,$threshold){ $timequeue = &$arr['timequeue'] ; while(!empty($timequeue[0])&&($timestamp-$timequeue[0])>$threshold){ array_shift($timequeue);

2016-07-29 comment 0  1156

Article Introduction：Oracle query is an important operation of the database and one of the most commonly used methods when operating the database. Good query efficiency can effectively improve the data processing speed and response time of the database, and greatly enhance the performance of the database. Therefore, mastering Oracle query methods and techniques is of great significance for improving the efficiency and performance of the database. In order to improve the efficiency of Oracle queries, we need to start from the following aspects. 1. Build an index An index is a data structure used to speed up the retrieval of data. Creating an index is for

2023-05-18 comment 0  943

Article Introduction：Microsoft Edge users using the browser on mobile or low-performance devices can enable Productivity Mode to improve browser performance. Efficiency Mode, formerly known as Performance Mode, is available as an option in Edge settings under System & Performance. The main idea behind Efficiency Mode is not a new one: put tabs that haven't been used in a while to sleep to free up memory and reduce CPU usage. You can use Microsoft E for Windows, Mac OS, and Linux

2023-04-14 comment 0  1540

Article Introduction：MySQL Order By Rand()效率

2016-06-01 comment 0  880

Article Introduction：high. Some coders who are in love with C/C++ know that C/C++ development efficiency is not high, and go can solve the problem of development efficiency. The performance of golang is relatively high. QPS, which does not require a framework to write an API, can be comparable to nginx.

2019-12-27 comment 0  3937

Article Introduction：Test code efficiency

2016-07-25 comment 0  1113

Article Introduction：MySQL is currently one of the most popular relational database management systems and is widely used in web development, data processing and other fields. In actual development, MySQL query efficiency is one of the important factors related to system performance and user experience. Therefore, this article will explore how to improve MySQL query efficiency. 1. Database design optimization Database design is one of the key factors for MySQL query efficiency. When designing the database, appropriate splitting and merging should be carried out according to actual needs, and indexes should be established according to business needs. If the index is not appropriate, it will cause the search

2023-05-14 comment 0  1181

Article Introduction：This code of mine is a test code to improve the efficiency of paging when there is a large amount of data - to improve the efficiency of paging:

2017-02-20 comment 0  1272

Article Introduction：PHP is not inefficient. On the contrary, PHP has many high-efficiency writing methods. For example: method staticization, static methods generate memory when the program starts, and instance methods generate memory while the program is running, so static methods can be called directly.

2019-10-21 comment 0  3114

Article Introduction：Function efficiency of strtotime in php

2016-07-25 comment 0  1115

Article Introduction：Mysql optimization select count efficiency

2016-12-02 comment 0  1394

Article Introduction：How to optimize MySQL connection efficiency? MySQL is an open source relational database management system that is widely used in various application and website development. The efficiency of MySQL connections has an important impact on the performance of database operations. If the database connection is inefficient, it will directly affect the application response time and user experience. Therefore, optimizing MySQL connection efficiency is an important task. The following will introduce some methods to optimize MySQL connection efficiency: Use connection pool: The connection pool is a way to manage database connections.

2023-06-29 comment 0  765

Article Introduction：Use Lambda expressions to improve the performance and efficiency of Java programs. In Java programming, performance and efficiency have always been the focus of developers. In order to better improve the performance and efficiency of the program, Java introduced Lambda expressions. Lambda expression is a kind of anonymous function, and the advantage of anonymous function is that it can write code more concisely and improve the performance and efficiency of the program. The following will use some specific code examples to introduce how to use Lambda expressions to improve the performance and efficiency of Java programs.

2024-01-30 comment 0  952

Article Introduction：MySQL subquery efficiency: The efficiency of using subquery [SELECT id,`name` FROM customer where id IN(select DISTINCT(customerid) from searchaccount] is 10 times higher.

2020-10-09 comment 0  3003