ผู้ชนะเทนนิสเมื่อแอชแลนด์ชนะซอฟต์บอล และวูสเตอร์ชนะวอลเลย์บอล ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
who won tennis when ashland won softball and wooster won volleybalIt is not neccessary to use all the tables.
 table_20797:  "Volleyball" [ text]  "Soccer" [ text]  "Tennis" [ text]  "Golf" [ text]  "Basketball" [ text]  "Swimming" [ text]  "Softball" [ text] 
SELECT "Tennis" FROM table_20797 WHERE "Softball" = 'Ashland' AND "Volleyball" = 'Wooster'