What is the highest numbered nightly rank for any episode? 
CREATE TABLE table_22892217_4 (nightly_rank INTEGER)
SELECT MAX(nightly_rank) FROM table_22892217_4
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_22892217_4 (nightly_rank INTEGER) Question: What is the highest numbered nightly rank for any episode?  [/INST] SELECT MAX(nightly_rank) FROM table_22892217_4 </s>