$qry="SELECT DISTINCT(city) FROM table WHERE country='$country'";
If there are no rows with a 'city' where country=$country, it still gives 1 row result of NULL!
Why does it return a blank row rather than no rows?
DISTINCT is not a function, don't put () around the column name.
If you get a row with value NULL returned, then apparently there is a row in the database where country=$country and city=NULL.
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