user: Question: What is the average grid of driver christian vietoris who has less than 12 laps?
Columns: ['Team', 'Driver', 'Laps', 'Time', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['South Africa', 'Adrian Zaugg', 12.0, "18'01.087", 1.0]
SQL:

assistant: SELECT AVG("Grid") FROM "Table" WHERE "Driver" = 'christian vietoris' AND "Laps" < 12.0;