Postgresql SQL查找书籍及其作者的最早日期

给出一个表“书”，如下所示

[name] [date] [author]
bookA   2019-08-12 Charles
bookB   2020-09-30 Jane
bookC   2019-08-12 Adam

期望输出如下（查找最早的日期，如果日期与作者的顺序相同）

我尝试了以下内容，但输出的只是按作者顺序列出的所有书籍

SELECT author, min(date)
FROM book
GROUP BY author
ORDER BY author;

SELECT author, min(date)
FROM book
GROUP BY author
ORDER BY author;

select author,date from book
where date=(select min(date) from book)
order by author