How many frequencies have a line of East London and destination of Crystal Palace?
CREATE TABLE table_name_18 (frequency__per_hour_ VARCHAR, line VARCHAR, destination VARCHAR)
SELECT COUNT(frequency__per_hour_) FROM table_name_18 WHERE line = "east london" AND destination = "crystal palace"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_18 (frequency__per_hour_ VARCHAR, line VARCHAR, destination VARCHAR) Question: How many frequencies have a line of East London and destination of Crystal Palace? [/INST] SELECT COUNT(frequency__per_hour_) FROM table_name_18 WHERE line = "east london" AND destination = "crystal palace" </s>