拥有超过2本书

Question

我必须只打印发布超过2本书的出版商，但对于我的成绩，我总是得到

PUB_NAME            |TOTAL      
--------------------------------
Abatis Publishers   |4          
Core Dump Books     |1     <------don't want to print     
Schadenfreude Press |3          
Tenterhooks Press   |5   

  

ERROR 42X01：语法错误：遇到＆＃34; HAVING＆＃34;

到目前为止，这是我的代码。

SELECT pub_name, COUNT(title_name) AS total
FROM publishers 
INNER JOIN titles
ON titles.pub_id = publishers.pub_id
GROUP BY pub_name;
HAVING total > 2;

Answer 1

在HAVING中无法识别总数。尝试HAVING COUNT（title_name）＆gt; 2;

同时删除';'在GROUP BY pub_name;

Answer 2

只需使用WHERE

SELECT p.pub_name, COUNT(t.title_name) AS total
FROM publishers p
INNER JOIN titles t ON t.pub_id = p.pub_id
WHERE COUNT(t.title_name) > 2
GROUP BY p.pub_name;