user: Question: When did Louise, Princess Royal get married?
Columns: ['Name dates', 'Eldest daughter from (date) to (date)', 'Father', 'Date married', 'Husband dates']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Sophia Dorothea of Hanover 1687–1757', '1714–1727', 'George I', '1706', 'Frederick William I of Prussia 1688–1740']
SQL:

assistant: SELECT "Date married" FROM "Table" WHERE "Name dates" = 'Louise, Princess Royal';