what is the number of networks listed in the table ?
CREATE TABLE table_203_756 (
    id number,
    "year" number,
    "title" text,
    "role" text,
    "network" text,
    "notes" text
)
SELECT COUNT(DISTINCT ("network")) FROM table_203_756
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 networks listed in the table ? ### Input: CREATE TABLE table_203_756 (
    id number,
    "year" number,
    "title" text,
    "role" text,
    "network" text,
    "notes" text
) ### Response: SELECT COUNT(DISTINCT ("network")) FROM table_203_756