What does the error message "Column 'forum_id' in from clause is ambiguous" indicate in PHP and MySQL?

The error message "Column 'forum_id' in from clause is ambiguous" indicates that there is a column named 'forum_id' in multiple tables in the query, and MySQL cannot determine which one to use. To solve this issue, you need to specify the table name or alias for the 'forum_id' column in the query to make it unambiguous. 

// Specify the table name or alias for the 'forum_id' column in the query
$query = "SELECT t.forum_id, t.topic_title, f.forum_name 
          FROM topics t 
          JOIN forums f ON t.forum_id = f.id";

Keywords

PHP MySQL error message ambiguous from clause

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