MySQL queries records with the most repeated occurrences

Source: Internet
Author: User

There are many ways to query MySQL. The MySQL query statements described below are used to query records that repeat the most times, which is helpful for learning MySQL query.

In some applications, we need to query the records with the most repeated times. Although this is a very simple query statement, it is still difficult for many beginners.

 
 
  1. SELECT keyword, count( * ) AS count  
  2. FROM article_keyword  
  3. GROUP BY keyword  
  4. ORDER BY count DESC  
  5. LIMIT 20  
  6.  

This query statement returns the 20 most repeated keyword records in the article_keyword table.

 
 
  1. SELECT DISTINCT count( * ) AS count  
  2. FROM article_keyword  
  3. GROUP BY keyword  
  4. ORDER BY count DESC  
  5. LIMIT 6  
  6.  

This query statement returns the number of keyword repetitions in the article_keyword table count) the top 6 values. A unique record is returned by adding DISTINCT.
 

Connection between MySQL column type selection and query efficiency

Troubleshooting of MySQL query timeout

Transformed from the MySQL Query Class of discuz

How MySQL query optimizer works

MySQL query results are sorted by a certain value

Related Article

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.

A Free Trial That Lets You Build Big!

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

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

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

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