user: Question: Who was Choong Tan Fook's opponent in 1999?
Columns: ['Outcome', 'Year', 'Tournament', 'Partner', 'Opponent']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Runner-up', 1989.0, 'Thailand Open', 'Razif Sidek', 'Park Joo-bong Kim Moon-soo']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Year" = 1999.0 AND "Partner" = 'Choong Tan Fook';