user: Question: How many values were used to express the years at school of the Maryland team?
Columns: ['Team', 'Head Coach', 'Years at School', 'Overall Record', 'Record at School', 'ACC Record']
Types: ['text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Boston College', 'Frank Spaziani', 3.0, '9–5', '9–5', '5–3']
SQL:

assistant: SELECT COUNT("Years at School") FROM "Table" WHERE "Team" = 'Maryland';