user: Question: How many NBA years did the player from the United States who was previously on the Los Angeles Lakers have?
Columns: ['Pick', 'Pos.', 'Nationality', 'Team', 'Previous team', 'NBA years [a ]', 'Career with the franchise [b ]']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'C', 'United States', 'Miami Heat', 'Dallas Mavericks', '1', '— [c ]']
SQL:

assistant: SELECT "NBA years [a ]" FROM "Table" WHERE "Nationality" = 'United States' AND "Previous team" = 'Los Angeles Lakers';