ปี 1991 ใดมี A 1993 ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Which 1991 has an A 1993 ?It is not neccessary to use all the tables.
 table_36304:  "Tournament" [ text]  "1988" [ text]  "1989" [ text]  "1990" [ text]  "1991" [ text]  "1992" [ text]  "1993" [ text]  "1994" [ text]  "1995" [ text]  "1996" [ text]  "1997" [ text]  "1998" [ text] 
SELECT "1991" FROM table_36304 WHERE "1993" = 'a'