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_20 (wheat_ VARCHAR, c_ VARCHAR, potato_ VARCHAR, d_ VARCHAR)
### Question:
What is the wheat amount when the potato amount of 1.9?
### Answer:
SELECT wheat_[c_] FROM table_name_20 WHERE potato_[d_] = "1.9"