Question

我的应用程序与sql lite数据库一起使用我在SQlite开发人员中进行了wrotte查询并测试它，这是正常工作但是当我在android上编写它时，它只返回一个值为几个的值。什么是android查询错误？

程序代码

SELECT DISTINCT
    m._id,
    m.name,
    m.the_best_time,
    m.the_worse_time,
    count(p._id) as qPoints
FROM sickness AS s
INNER JOIN list_of_sicknesses AS l
    ON s._id = l.sickness_id
INNER JOIN point AS p
    ON p.sickness_list = l.number
INNER JOIN meridian AS m
    ON m._id = p.meridian_id
WHERE s.sick = 'value'
GROUP BY
    m.name,
    m.the_best_time,
    m.the_worse_time,m._id

android查询代码

 String query="select distinct m." +MeridianDB.ID+
            ",m."+MeridianDB.NAME+",m."+MeridianDB.BEST_TIME+
            ",m."+MeridianDB.WORSE_TIME+",count(p."+PointDB.ID+") as         qPoints from "+
            SicknessDB.TABLE_NAME+" as s inner join "+ListOFSicknessDB.TABLE_NAME+
            " as l on s."+SicknessDB.ID+" = l."+ListOFSicknessDB.SICKNESS_ID+
            " inner join "+PointDB.TABLE_NAME+" as p on p."+PointDB.SICKNESS_LIST+
            " = l."+ListOFSicknessDB.NUMBER+" inner join "+MeridianDB.TABLE_NAME+
            " as m on m."+MeridianDB.ID+" = p."+PointDB.MERIDIAN_ID+" where s."+
            SicknessDB.NAME+"=? group by m."+MeridianDB.ID+",m."+MeridianDB.NAME+
            ",m."+MeridianDB.BEST_TIME+",m."+MeridianDB.WORSE_TIME;

Answer 1

尝试删除DISTINCT子句（因为您已经在使用GROUP BY）我不确定此问题是否存在，但在同一个查询中同时使用DISTINCT和GROUP BY通常不是最佳做法

我的查询工作不正确

1 个答案: