java - MySql 中的查询问题

Question

String sql = "SELECT siteapplications.Application, Count(visits.VisitId) AS CountOfVisitId 
FROM visits, siteapplications 
WHERE visits.SiteApplicationId=siteapplications.ApplicationID 
and Month(visits.VisitTime)=" + month + " 
and Year(visits.VisitTime)=" + year + 
"GROUP BY siteapplications.Application 
ORDER BY CountOfVisitId DESC;";
rs = st.executeQuery(sql); 

当我运行它时，我在 java 中得到这个错误:

您的 SQL 语法有误；检查与您的 MySQL 服务器版本对应的手册，了解在第 1 行的“BY Application ORDER BY CountOfVisitId DESC”附近使用的正确语法

我没有看到错误...

谁能帮忙...

谢谢大家

Answer 1

" and Year(visits.VisitTime)=" + year + "GROUP BY ...

应该是:

" and Year(visits.VisitTime)=" + year + " GROUP BY ...

您的版本在 GROUP 之前缺少一个空格。