SELECT Date, COUNT(Date) FROM member_attendance AS T1 JOIN member AS T2 ON T1.Member_ID = T2.Member_ID JOIN performance AS T3 ON T1.Performance_ID = T3.Performance_ID WHERE T2.Role = "Violin" GROUP BY Date ORDER BY Date
Show the dates of performances with attending members whose roles are 'Violin', and count them by a bar chart, and display by the x-axis from low to high.
CREATE TABLE member (
    Member_ID text,
    Name text,
    Nationality text,
    Role text
)

CREATE TABLE performance (
    Performance_ID real,
    Date text,
    Host text,
    Location text,
    Attendance int
)

CREATE TABLE member_attendance (
    Member_ID int,
    Performance_ID int,
    Num_of_Pieces int
)