What is the league established before 1930 with the rayo vallecano club?
CREATE TABLE table_name_26 (
    league VARCHAR,
    established VARCHAR,
    club VARCHAR
)
SELECT league FROM table_name_26 WHERE established < 1930 AND club = "rayo vallecano"
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 league established before 1930 with the rayo vallecano club? ### Input: CREATE TABLE table_name_26 (
    league VARCHAR,
    established VARCHAR,
    club VARCHAR
) ### Response: SELECT league FROM table_name_26 WHERE established < 1930 AND club = "rayo vallecano"