How many destinations have a weekly frequency and are named AC Express?
CREATE TABLE table_21716139_1 (destination VARCHAR, frequency VARCHAR, train_name VARCHAR)
SELECT COUNT(destination) FROM table_21716139_1 WHERE frequency = "Weekly" AND train_name = "AC Express"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21716139_1 (destination VARCHAR, frequency VARCHAR, train_name VARCHAR) Question: How many destinations have a weekly frequency and are named AC Express? [/INST] SELECT COUNT(destination) FROM table_21716139_1 WHERE frequency = "Weekly" AND train_name = "AC Express" </s>