user: Question: What is 1987 Grand Slam Tournament if 1989 is also Grand Slam Tournaments?
Columns: ['Tournament', '1987', '1988', '1989', '1990', '1991', '1992', '1993', '1994', '1995', '1996', '1997']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments']
SQL:

assistant: SELECT "1987" FROM "Table" WHERE "1989" = 'Grand Slam Tournaments';