Which Diameter (km) has a Name of alma-merghen planitia, and a Year named smaller than 1997?
CREATE TABLE table_name_4 (
    diameter__km_ INTEGER,
    name VARCHAR,
    year_named VARCHAR
)
SELECT MAX(diameter__km_) FROM table_name_4 WHERE name = "alma-merghen planitia" AND year_named < 1997
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: Which Diameter (km) has a Name of alma-merghen planitia, and a Year named smaller than 1997? ### Input: CREATE TABLE table_name_4 (
    diameter__km_ INTEGER,
    name VARCHAR,
    year_named VARCHAR
) ### Response: SELECT MAX(diameter__km_) FROM table_name_4 WHERE name = "alma-merghen planitia" AND year_named < 1997