user: Question: What is the 2004 that has a of Grand Slam Tournaments in2006 ?
Columns: ['Tournament', '2004', '2005', '2006', '2007']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments']
SQL:

assistant: SELECT "2004" FROM "Table" WHERE "2006" = 'Grand Slam Tournaments';