Which league's playoffs was national semi-finals?
CREATE TABLE table_name_51 (league VARCHAR, playoffs VARCHAR)
SELECT league FROM table_name_51 WHERE playoffs = "national semi-finals"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_51 (league VARCHAR, playoffs VARCHAR) Question: Which league's playoffs was national semi-finals? [/INST] SELECT league FROM table_name_51 WHERE playoffs = "national semi-finals" </s>