Find the number of users who posted some tweets.
CREATE TABLE tweets (
    UID VARCHAR
)
SELECT COUNT(DISTINCT UID) FROM tweets
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: Find the number of users who posted some tweets. ### Input: CREATE TABLE tweets (
    UID VARCHAR
) ### Response: SELECT COUNT(DISTINCT UID) FROM tweets