Locale sensitivity can be applied to the
string data type only. What is more, the Locale has to be specified either for the field or the whole record.
Field settings override the Locale sensitivity specified for the whole record.
Values of Locale sensitivity are the following:
base_letter_sensitivity
Does not distinguish different cases of letters nor letters with diacritical marks.
accent_sensitivity
Does not distinguish different cases of letters. It distinguishes letters with diacritical marks.
case_sensitivity
Distinguishes different cases of letters and letters with diacritical marks. It does not distinguish the letter encoding ("\u00C0" equals to "A\u0300")
identical_sensitivity
Distinguishes the letter encoding ("\u00C0" equals to "A\u0300")