Home > Developer Tools > MySQL Tutorials

mysql sql DISTINCT delete duplicate records

Source: Internet
Author: User
Keywords Network programming Mysql tutorial
Tags data delete example guide how many how to how to use list
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

mysql tutorial sql distinct delete duplicate records

How to use the distinct keyword in mysql to filter the list of duplicate values ​​in a select statement

If you want to delete duplicate data when querying data, you can use the distinct keyword to filter duplicate values.

select distinct column_name from table_name;

Let's take a look at a simple example where we have a car list. Each car has an id, brand, type and color, but for now we simply list all brands:

select brand from car;
the result is: audi audi audi bmw bmw lexus lexus

As you can see the brand shows several times. But what we want is to know how many different brands are in db. To get this extended query, look like this

select distinct brand from car;
the result is:
audi bmw
lexus



If you want to know how many different brands, then we must use the count group by to achieve the following example


select brand, count (brand) from car group by brand;
and the result is: brand count (brand)
audi 3
bmw 2
lexus 2

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
delete duplicate records in mysql query how to delete duplicate records in mysql sql query to delete duplicate records how to delete duplicate records in sql query mysql duplicate records how to delete one record from duplicate records in sql check duplicate records in sql
Related Article
5 Steps to Migrate from MySQL to MariaDB Database
Install MySQL 8.0.11 on the Ubuntu 18.04 / 16.04 Command line
Steps to install MariaDB 10.4 on Ubuntu 18.04 system
Solve the MySQL does not allow remote access method
23 considerations for using MySQL database
Mysql command to import sql data backup method

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

Hot Article
Hot Tags
computing conference access forum computer class data get http html applications
Popular Keywords
html add blank space register business logo register ssl certificate full site sign in sign up node js build cloud register register a subdomain in python network management system tutorial how to learn computer science by myself

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More