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_42 (released VARCHAR, memory_type VARCHAR)
### Question:
Whas is the released date of the memory type ddr2-667?
### Answer:
SELECT released FROM table_name_42 WHERE memory_type = "ddr2-667"