MySQL Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation ‘Concat’

Standard

Recently fall on the problem below:

collations

The quick solution here:
1. Open phpMyAdmin, then go to database table where data come from. Click on structure tab on phpMyAdmin for selected table like below:

collations

2. On the top image you will see on Collation row. Here first_name Collation set to utf8_general_ci and last_name Collation set to utf32_general_ci.

When I have change last_name Collation to utf8_general_ci like below the problem solved.

collation_fix

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