user: Question: Name the number of playoffs for Semifinals
Columns: ['Season', 'Regular Season', 'Playoffs', 'U.S. Open Cup', 'CONCACAF', 'MLS Regular Season Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1999.0, '3rd, West', 'Lost Conference Semifinals ( Dallas Burn 1-2)', 'Round of 16', '3rd Place', '18–14–0']
SQL:

assistant: SELECT COUNT("Playoffs") FROM "Table" WHERE "CONCACAF" = 'Semifinals';