call the appropriate and correct database

How do I call first database table as follows :

id | country | province | distric | cost
------------------------------------------------
1 | USA | Alanama | distrik | 20
2 | USA | Alabama | distrik2 | 22
3 | USA | Alabama | distrik3 | 22
4 | France | Paris | disrik4 | 30

now I use 3 kinds of calls to select a form below. I am using Jquery 
chain (no problem) :

1. SELECT country from table GROUP BY country ORDER BY country ASC
<select>
<option value="country" class="">Country</option>
</select>

2. SELECT province from table GROUP BY province ORDER BY province ASC
<select>
<option value="province" class="Country">Province</option>
</select>

3. SELECT distric from table GROUP BY distric ORDER BY distric ASC
<select>
<option value="distric" class="province">distric</option>
</select>

What I want to call the database whether it is appropriate ? or is there 
another way that is more simple .
Loading page is very long .
Kindly enlighten


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