Investigate Collation in MySQL [uts-0070]

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#### utensil opened issue at 2016-06-23 02:47:

See http://dev.mysql.com/doc/refman/5.7/en/charset-collation-effect.html .

``` bash
echo -n 德|iconv -f 'utf-8' -t 'GBK'|xxd -p
b5c2
echo -n 得|iconv -f 'utf-8' -t 'GBK'|xxd -p
b5c3
```