CREATE TABLE table_name_87 (crest_length__meters_ VARCHAR2, year_of_construction VARCHAR2, name VARCHAR2)

Tell me the total number of crest length for year construction larger than 1957 for mattmark
SELECT COUNT(crest_length__meters_) FROM table_name_87 WHERE year_of_construction > 1957 AND name = "mattmark"
SELECT COUNT("crest_length__meters_") FROM "table_name_87" WHERE "mattmark" = "name" AND "year_of_construction" > 1957