On how many different dates was event 1 Suspension Bridge?
CREATE TABLE table_17257687_1 (air_date VARCHAR, event_1 VARCHAR)
SELECT COUNT(air_date) FROM table_17257687_1 WHERE event_1 = "Suspension Bridge"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_17257687_1 (air_date VARCHAR, event_1 VARCHAR) Question: On how many different dates was event 1 Suspension Bridge? [/INST] SELECT COUNT(air_date) FROM table_17257687_1 WHERE event_1 = "Suspension Bridge" </s>