CREATE TABLE table_36304 ("Tournament" CLOB, "1988" CLOB, "1989" CLOB, "1990" CLOB, "1991" CLOB, "1992" CLOB, "1993" CLOB, "1994" CLOB, "1995" CLOB, "1996" CLOB, "1997" CLOB, "1998" CLOB)

Which 1991 has an A 1993 ?
SELECT "1991" FROM table_36304 WHERE "1993" = 'a'
SELECT "1991" FROM "table_36304" WHERE "1993" = 'a'