UTF-8 or not? charset issues
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I got really a headachke. I have some tables (let's name it T1) that have set their charset to utf8_polish_ci (I want sorting to do with it), and when I not set character_set_result, then results are good, but I have also a table (let's name it T2) that have some rows entered by vanilla utf-8, but also have utf8_polish_ci collation. 
Funny thing is that when I enter data form existing tables in database via a php script then data in tables are good in MySQL workbench, but they are bad when I view them on site, cause utf8 chars gone wild. When I enter data via a form, and PHP script data are good both in mysql workbench, and on site. 
I resolve that by putting `SET character_set_results = 'UTF8';` before any statement. Then T2 is good, but data from T1 is bad. So it reversed my problem. 