sql - 在sql中使用计数查询

Question

我如何编写一个 SQL 来显示作者及其出版物的总数，并在我的 SELECT 语句中包含一个子查询，但这就是我所拥有的

Answer 1

SELECT a.auth_name,COUNT( p.pub_title ) AS count_of_publications 
  FROM Author a
LEFT JOIN
       Wrote w
    ON a.auth_id = w.auth_id
LEFT JOIN 
       Publication p
    ON w.pub_id = p.pub_id
GROUP BY a.auth_name;