user: Question: In what Week was the Attendance 39,923?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 4, 1994', 'Cleveland Browns', 'L 20–28', '52,778']
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Attendance" = '39,923';