What is the number of distinct publication dates?
CREATE TABLE publication (
    Publication_Date VARCHAR
)
SELECT COUNT(DISTINCT Publication_Date) FROM publication
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the number of distinct publication dates? ### Input: CREATE TABLE publication (
    Publication_Date VARCHAR
) ### Response: SELECT COUNT(DISTINCT Publication_Date) FROM publication