user: Question: Tell me the sum of rank for Australia when points are less than 79
Columns: ['Rank', 'Previous Rank', 'Name', 'Nationality', 'Team', 'Points']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, '1', 'Davide Rebellin', 'Italy', 'Gerolsteiner', 157.0]
SQL:

assistant: SELECT SUM("Rank") FROM "Table" WHERE "Nationality" = 'Australia' AND "Points" < 79.0;