MySQL，将值作为select语句的Insert语句

我正在尝试将值作为insert语句插入此表。我想我只是使用了错误的语法。有什么帮助吗？

值仅在插入文字记录时使用。相反，只需插入包含两个子查询的select语句：

insert into class_pre_req(class_id, cpr_id) values(select class_id from classes where catlg_nbr = 265 and subject_id = 27, select class_id from classes where catlg_nbr = 166 and subject_id = 27);

请注意，为了使其工作，每个子查询必须返回一个值

INSERT INTO class_pre_req (class_id, cpr_id)
SELECT
    (SELECT class_id FROM classes WHERE catlg_nbr = 265 AND subject_id = 27),
    (SELECT class_id FROM classes WHERE catlg_nbr = 166 AND subject_id = 27);