Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_12095519_1 (frequency VARCHAR, origin VARCHAR)
### Question:
How often does a train leave sealdah?
### Answer:
SELECT frequency FROM table_12095519_1 WHERE origin = "Sealdah"