user: Question: What is the minimum of t20 matches?
Columns: ['Name of ground', 'Location', 'Year', 'FC matches', 'LA matches', 'T20 matches', 'Total']
Types: ['text', 'text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['Riverside Ground', 'Chester-le-Street', '1995–present', 102.0, 124.0, 15.0, 241.0]
SQL:

assistant: SELECT MIN("T20 matches") FROM "Table";