Name the slope length for 1966 groundstation
CREATE TABLE table_17814458_1 (slope_length VARCHAR, elevation_groundstation VARCHAR)
SELECT COUNT(slope_length) FROM table_17814458_1 WHERE elevation_groundstation = 1966
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_17814458_1 (slope_length VARCHAR, elevation_groundstation VARCHAR) Question: Name the slope length for 1966 groundstation [/INST] SELECT COUNT(slope_length) FROM table_17814458_1 WHERE elevation_groundstation = 1966 </s>