title: Polish and German accented letters in mysql
body: <p>I want to store in unique column polish and german signs. 
  When i alter database:</p>
  
  <pre><code>alter database osa character set utf8 collate utf8_general_ci;
  </code></pre>
  
  <p>I have a problem with german signs.</p>
  
  <pre><code>sql&gt; insert into company(uuid, name) VALUE ("1","IDE")
  [2016-11-27 10:37:35] 1 row affected in 13ms
  
  sql&gt; insert into company(uuid, name) VALUE ("2","IDĘ")
  [2016-11-27 10:37:37] 1 row affected in 9ms
  
  sql&gt; insert into company(uuid, name) VALUE ("3","Schuring")
  [2016-11-27 10:37:38] 1 row affected in 13ms
  
  sql&gt; insert into company(uuid, name) VALUE ("4","Schüring")
  [2016-11-27 10:37:39] [23000][1062] Duplicate entry 'Schüring' for key 'UK_niu8sfil2gxywcru9ah3r4ec5'
  </code></pre>
  
  <p>Which collate I have to use?</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>Also not works for utf8_unicode_ci</p>