user: Question: What is the average Byes for the losses of 15, and before 1874?
Columns: ['Ballarat FL', 'Wins', 'Byes', 'Losses', 'Draws', 'Against']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['East Point', 16.0, 0.0, 2.0, 0.0, 1037.0]
SQL:

assistant: SELECT AVG("Byes") FROM "Table" WHERE "Losses" = 15.0 AND "Against" < 1874.0;