Question

I’m beginning to learn about connecting to databases via Java programs. I have a table called City, which contains just two columns: CityName and Population. I want to find the highest population, and then give that population along with the name of the corresponding city.

I know how to get just the highest population (see the following, which I know is probably not ideal but at least is working for me):

            double max = 0.0;
            String sqlStatement = "SELECT MAX(Population) FROM City"; 
            ResultSet result = stmt.executeQuery(sqlStatement);
            if (result.next())
            {
                   highest = result.getDouble(1);
            }
            System.out.printf("Highest population: %,.0f", highest);

I am pretty sure that to get the highest population PLUS the name of the corresponding city, my Sql statement should eb changed to :

"SELECT CityName, MAX(Population) FROM City GROUP BY CityName";

But I can’t get it to work beyond that. I thought I could add something like

String highestCity = result.getString(2)

and then add highestCity to the System.out.printf output line, but that isn’t working.

Can anyone help?

Thanks!

Answer 1

How about this ?

 String sqlStatement = "SELECT CityName, Population FROM City WHERE Population IN (SELECT MAX(Population) FROM City)";