Find the number of students that have at least one grade 'B'.
CREATE TABLE ENROLLED_IN (
    StuID VARCHAR,
    Grade VARCHAR
)
SELECT COUNT(DISTINCT StuID) FROM ENROLLED_IN WHERE Grade = "B"
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 students that have at least one grade 'B'. ### Input: CREATE TABLE ENROLLED_IN (
    StuID VARCHAR,
    Grade VARCHAR
) ### Response: SELECT COUNT(DISTINCT StuID) FROM ENROLLED_IN WHERE Grade = "B"