PHPMYADMIN Collation Error
When you use mySQL databases and manage them with phpMyAdmin, you must be careful about the collation. If you try to do a join and the collation is different with two tables, you can get an error and will have to change one of the table's collation in order to receice your expected mySQL query results.
The example below shows the phpMyAdmin error which explains that the collations are an illegal mix. After that, it is explained that you could change the collation of the utf_general_ci table to utf_unicode_ci. For simplicity, it is always easiest to design all of your database tables and indexed columns with uniform collations in order to avoid errors.
PHPMYADMIN ERROR #1267 - Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLICIT) for operation Solution Collate the tables ie) Change utf_general_ci to utf_unicode_ci