How many platforms have a southern opertator and the pattern is all stations via clapham junction?
CREATE TABLE table_1569516_1 (platform VARCHAR, operator VARCHAR, service_pattern VARCHAR)
SELECT COUNT(platform) FROM table_1569516_1 WHERE operator = "Southern" AND service_pattern = "All stations via Clapham Junction"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_1569516_1 (platform VARCHAR, operator VARCHAR, service_pattern VARCHAR) Question: How many platforms have a southern opertator and the pattern is all stations via clapham junction? [/INST] SELECT COUNT(platform) FROM table_1569516_1 WHERE operator = "Southern" AND service_pattern = "All stations via Clapham Junction" </s>