user: Question: What Week 2 has a Week 4 of Piret Aava?
Columns: ['Week 1', 'Week 2', 'Week 3', 'Week 4', 'Week 5']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Vanessa Marie Arevalo', 'Jillian Mae Sundeen', 'Wendy Rosprim', 'Paulette Myers*', 'Alina Novozilova']
SQL:

assistant: SELECT "Week 2" FROM "Table" WHERE "Week 4" = 'Piret Aava';