What is the bore of the boat howitzers with a 12-pdr heavy designation?
CREATE TABLE table_name_8 (
    bore VARCHAR,
    designation VARCHAR
)
SELECT bore FROM table_name_8 WHERE designation = "12-pdr heavy"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the bore of the boat howitzers with a 12-pdr heavy designation? ### Input: CREATE TABLE table_name_8 (
    bore VARCHAR,
    designation VARCHAR
) ### Response: SELECT bore FROM table_name_8 WHERE designation = "12-pdr heavy"