user: Question: How many different high points results are there for the game on May 15?
Columns: ['Game', 'Date', 'Team', 'Score', 'High points', 'High rebounds', 'High assists', 'Location Attendance', 'Series']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'May 8', '@ Houston', 'W 91–87', 'Charles Barkley (21)', 'Charles Barkley (12)', 'Kevin Johnson (12)', 'The Summit 15,073', '1–0']
SQL:

assistant: SELECT COUNT("High points") FROM "Table" WHERE "Date" = 'May 15';