How many episodes did David Jackson write and direct?
CREATE TABLE table_11695215_1 (
    written_by VARCHAR,
    directed_by VARCHAR
)
SELECT COUNT(written_by) FROM table_11695215_1 WHERE directed_by = "David Jackson"
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: How many episodes did David Jackson write and direct? ### Input: CREATE TABLE table_11695215_1 (
    written_by VARCHAR,
    directed_by VARCHAR
) ### Response: SELECT COUNT(written_by) FROM table_11695215_1 WHERE directed_by = "David Jackson"