Home Database Mysql Tutorial SQL练习:获取最后十条记录

SQL练习:获取最后十条记录

Jun 07, 2016 pm 04:24 PM
sql database at last practise Obtain Record

获取数据库最后若干条记录是很常见的用法,下面分别用几种方法去实现,当作SQL的练习吧。 一种方法是数据库记录倒序排序,然后用limit 10子句获取10条: mysql> SELECT title AS TITLE FROM news ORDER BY id DESC LIMIT 10; 查询结果: +------------------

获取数据库最后若干条记录是很常见的用法,下面分别用几种方法去实现,当作SQL的练习吧。

一种方法是数据库记录倒序排序,然后用limit 10子句获取10条:

mysql> SELECT title AS TITLE FROM news ORDER BY id DESC LIMIT 10;
Copy after login

查询结果:

+-----------------------------------------+
| TITLE                                   |
+-----------------------------------------+
| 阿里巴巴反对雅虎CEO进阿里董事会         |
| 康盛创想戴志康加入腾讯                  |
| Android不断蚕食智能手机市场             |
| Blizzard:研发团队要对项目充满热情      |
| 后起之秀Facebook对Google的冲击          |
| 360在互联网四处树敌                     |
| 雅虎CEO声明:不会干涉阿里巴巴的经营业务 |
| 台服魔兽世界大灾变资料片开放下载        |
| 选择成熟的技术还是最新的技术            |
| 雅虎错误连连不段                        |
+-----------------------------------------+
10 rows in set
Copy after login

也可以取得最大记录的id,然后在WHERE子句减去10。

mysql> SELECT temp.title as 标题 FROM news AS temp WHERE news_id > (SELECT MAX(id) FROM news) - 10;
Copy after login

查询结果:

+-----------------------------------------+
| 标题                                    |
+-----------------------------------------+
| 雅虎错误连连不段                        |
| 选择成熟的技术还是最新的技术            |
| 台服魔兽世界大灾变资料片开放下载        |
| 雅虎CEO声明:不会干涉阿里巴巴的经营业务 |
| 360在互联网四处树敌                     |
| 后起之秀Facebook对Google的冲击          |
| Blizzard:研发团队要对项目充满热情      |
| Android不断蚕食智能手机市场             |
| 康盛创想戴志康加入腾讯                  |
| 阿里巴巴反对雅虎CEO进阿里董事会         |
+-----------------------------------------+
10 rows in set
Copy after login

下面也是用一样的方法,不过使用的是 count() 函数:

mysql> SELECT temp.title as 标题, temp.id as ID FROM news AS temp WHERE id > (SELECT count(temp.id) FROM news) - 10;
Copy after login

查询结果:

+-----------------------------------------+-----+
| 标题                                    | ID  |
+-----------------------------------------+-----+
| 雅虎错误连连不段                        | 197 |
| 选择成熟的技术还是最新的技术            | 198 |
| 台服魔兽世界大灾变资料片开放下载        | 199 |
| 雅虎CEO声明:不会干涉阿里巴巴的经营业务 | 200 |
| 360在互联网四处树敌                     | 201 |
| 后起之秀Facebook对Google的冲击          | 202 |
| Blizzard:研发团队要对项目充满热情      | 203 |
| Android不断蚕食智能手机市场             | 204 |
| 康盛创想戴志康加入腾讯                  | 205 |
| 阿里巴巴反对雅虎CEO进阿里董事会         | 206 |
+-----------------------------------------+-----+
10 rows in set
Copy after login
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
1 months ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What is the difference between HQL and SQL in Hibernate framework? What is the difference between HQL and SQL in Hibernate framework? Apr 17, 2024 pm 02:57 PM

HQL and SQL are compared in the Hibernate framework: HQL (1. Object-oriented syntax, 2. Database-independent queries, 3. Type safety), while SQL directly operates the database (1. Database-independent standards, 2. Complex executable queries and data manipulation).

How does Hibernate implement polymorphic mapping? How does Hibernate implement polymorphic mapping? Apr 17, 2024 pm 12:09 PM

Hibernate polymorphic mapping can map inherited classes to the database and provides the following mapping types: joined-subclass: Create a separate table for the subclass, including all columns of the parent class. table-per-class: Create a separate table for subclasses, containing only subclass-specific columns. union-subclass: similar to joined-subclass, but the parent class table unions all subclass columns.

iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos Jul 18, 2024 am 05:48 AM

Apple's latest releases of iOS18, iPadOS18 and macOS Sequoia systems have added an important feature to the Photos application, designed to help users easily recover photos and videos lost or damaged due to various reasons. The new feature introduces an album called "Recovered" in the Tools section of the Photos app that will automatically appear when a user has pictures or videos on their device that are not part of their photo library. The emergence of the "Recovered" album provides a solution for photos and videos lost due to database corruption, the camera application not saving to the photo library correctly, or a third-party application managing the photo library. Users only need a few simple steps

Detailed tutorial on establishing a database connection using MySQLi in PHP Detailed tutorial on establishing a database connection using MySQLi in PHP Jun 04, 2024 pm 01:42 PM

How to use MySQLi to establish a database connection in PHP: Include MySQLi extension (require_once) Create connection function (functionconnect_to_db) Call connection function ($conn=connect_to_db()) Execute query ($result=$conn->query()) Close connection ( $conn->close())

How to handle database connection errors in PHP How to handle database connection errors in PHP Jun 05, 2024 pm 02:16 PM

To handle database connection errors in PHP, you can use the following steps: Use mysqli_connect_errno() to obtain the error code. Use mysqli_connect_error() to get the error message. By capturing and logging these error messages, database connection issues can be easily identified and resolved, ensuring the smooth running of your application.

How to use database callback functions in Golang? How to use database callback functions in Golang? Jun 03, 2024 pm 02:20 PM

Using the database callback function in Golang can achieve: executing custom code after the specified database operation is completed. Add custom behavior through separate functions without writing additional code. Callback functions are available for insert, update, delete, and query operations. You must use the sql.Exec, sql.QueryRow, or sql.Query function to use the callback function.

How to connect to remote database using Golang? How to connect to remote database using Golang? Jun 01, 2024 pm 08:31 PM

Through the Go standard library database/sql package, you can connect to remote databases such as MySQL, PostgreSQL or SQLite: create a connection string containing database connection information. Use the sql.Open() function to open a database connection. Perform database operations such as SQL queries and insert operations. Use defer to close the database connection to release resources.

PHP connections to different databases: MySQL, PostgreSQL, Oracle and more PHP connections to different databases: MySQL, PostgreSQL, Oracle and more Jun 01, 2024 pm 03:02 PM

PHP database connection guide: MySQL: Install the MySQLi extension and create a connection (servername, username, password, dbname). PostgreSQL: Install the PgSQL extension and create a connection (host, dbname, user, password). Oracle: Install the OracleOCI8 extension and create a connection (servername, username, password). Practical case: Obtain MySQL data, PostgreSQL query, OracleOCI8 update record.

See all articles