Write SQL query to solve given problem: How many countries in Europe & Central Asia uses Danish krone as its currency? List the full names of those coutnries.. Keep the solution inside sql tag ```sql [SQL-Query] ```
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'