CREATE TABLE table_name_64 (nickname VARCHAR2, gender VARCHAR2, weight_at_birth VARCHAR2)

What is the nickname of the boy who weighed 810g (26.0 oz.) at birth?
SELECT nickname FROM table_name_64 WHERE gender = "boy" AND weight_at_birth = "810g (26.0 oz.)"
SELECT "nickname" FROM "table_name_64" WHERE "810g (26.0 oz.)" = "weight_at_birth" AND "boy" = "gender"