user: Question: what's the total number of singles w-l with doubles w-l of 0–0 and total w-l of 3–1
Columns: ['Player', 'Years Played', 'Total W-L', 'Singles W-L', 'Doubles W-L']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Cho Soong-Jae (630)', '1 (2011)', '2–0', '1–0', '1–0']
SQL:

assistant: SELECT COUNT("Singles W-L") FROM "Table" WHERE "Doubles W-L" = '0–0' AND "Total W-L" = '3–1';