user: Question: What was the episode number for the episode viewed by 5.68 million viewers?
Columns: ['Series episode', 'Season episode', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (in million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [25.0, 1.0, '" All Mixed Up "', 'Bill Lawrence', 'Kevin Biegel & Bill Lawrence', 'September22,2010', '8.32']
SQL:

assistant: SELECT "Season episode" FROM "Table" WHERE "U.S. viewers (in million)" = '5.68';