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_name_55 (chng VARCHAR, rank VARCHAR, prev VARCHAR)
### Question:
What chng has a rank greater than 6, with 12 as a prev?
### Answer:
SELECT chng FROM table_name_55 WHERE rank > 6 AND prev = 12