Grouping unique values from an SQL column as headings, another column as subheadings and another as sub-subheadings Using PHP

Question

I have a table with columns and values similar to:

|country  |region  |city       |
|------------------------------|
|USA      |Maine   |Bar Harbor |
|Australia|Victoria|Melbourne  |
|Spain    |Valencia|Enguera    |
|Australia|Victoria|Colbo      |
|USA      |New York|NYC        |

I'd like to display this in alphabetical order like this:

Australia
 Victoria
  Colbo
  Melbourne

Spain
 Valencia
  Enguera

USA
 Maine
  Bar Harbor
 New York
  NYC

I have attempted to use nested for loops which I found suggested in this question: How do I get unique values from a column and group them with values from another column? But I've had difficulty adding the third value column.

Answer 1

• Select from the given table order by country, region, city.
• Loop through the result set and print the fields. (with the exceptions I describe below.) (X)
• After each iteration save the last record
  • (X) print only the country if it doesn't equal with the previous
  • (X) and print only the region if the country/region doesn't equal with the previous.

(when you skip a printing, you can print a few spaces, to create a tabulated like view like in your example.)

Answer 2

hopefully work

    select country,region,city from table group by country,region 
order by country asc,region desc ,city desc