SyntaxFix

[mysql] MySQL Multiple Left Joins

You're missing a GROUP BY clause:

SELECT news.id, users.username, news.title, news.date, news.body, COUNT(comments.id)
FROM news
LEFT JOIN users
ON news.user_id = users.id
LEFT JOIN comments
ON comments.news_id = news.id
GROUP BY news.id

The left join is correct. If you used an INNER or RIGHT JOIN then you wouldn't get news items that didn't have comments.

Examples related to mysql

• Implement specialization in ER diagram • How to post query parameters with Axios? • PHP with MySQL 8.0+ error: The server requested authentication method unknown to the client • Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver' • phpMyAdmin - Error > Incorrect format parameter? • Authentication plugin 'caching_sha2_password' is not supported • How to resolve Unable to load authentication plugin 'caching_sha2_password' issue • Connection Java-MySql : Public Key Retrieval is not allowed • How to grant all privileges to root user in MySQL 8.0 • MySQL 8.0 - Client does not support authentication protocol requested by server; consider upgrading MySQL client

Examples related to join

• Pandas Merging 101 • pandas: merge (join) two data frames on multiple columns • How to use the COLLATE in a JOIN in SQL Server? • How to join multiple collections with $lookup in mongodb • How to join on multiple columns in Pyspark? • Pandas join issue: columns overlap but no suffix specified • MySQL select rows where left join is null • How to return rows from left table not found in right table? • Why do multiple-table joins produce duplicate rows? • pandas three-way joining multiple dataframes on columns