How many countries in Europe & Central Asia uses Danish krone as its currency? List the full names of those coutnries.
countries in Europe & Central Asia refer to region = 'Europe & Central Asia'; uses Danish krone refers to currencyunit = 'Danish krone'; full name refers to longname
SELECT COUNT(longname) FROM country WHERE region = 'Europe & Central Asia' AND currencyunit = 'Danish krone' UNION SELECT longname FROM country WHERE currencyunit = 'Danish krone' AND region = 'Europe & Central Asia'