Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_15059783_1 (combination_classification VARCHAR, points_classification VARCHAR, winner VARCHAR)
### Question:
How many combination classifications have the winner as Erik Zabel and a points classification as Alessandro Petacchi
### Answer:
SELECT COUNT(combination_classification) FROM table_15059783_1 WHERE points_classification = "Alessandro Petacchi" AND winner = "Erik Zabel"