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"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_26 (league VARCHAR, established VARCHAR, club VARCHAR) Question: What is the league established before 1930 with the rayo vallecano club? [/INST] SELECT league FROM table_name_26 WHERE established < 1930 AND club = "rayo vallecano" </s>