查询以检索过去24个月内租用最多的图书

Question

如何查找过去24个月内租用最多的图书？

 rentedBooks (rentid, bookid, dateout, datein)  

我尝试了以下内容：

SELECT * FROM RENTEDBOOKS, COUNT(BOOKID) WHERE DATEIN >= DATEADD(MONTH, -24, GETDATE()); 

但是继续收到提及无效标识符的错误：S

注意：我没有使用mysql！

Answer 1

SELECT BOOKID, COUNT(*) cnt
FROM RENTEDBOOKS
WHERE DATEIN >= sysdate - interval '24' month
group by BOOKID
order by cnt desc; 

修改

SELECT BOOKID, COUNT(*) cnt
FROM RENTEDBOOKS
WHERE DATEIN >= add_months(sysdate, -24)
group by BOOKID
order by cnt desc; 

Answer 2

我不确定您的WHERE子句（DATEADD，getdate）发生了什么，但其余部分看起来应该是这样......

SELECT BOOKID, COUNT(BOOKID) 
FROM RENTEDBOOKS
WHERE ...
GROUP BY BOOKID; 

Answer 3

WHERE DATEIN >= DATEADD('m',-24, Date$());