从SQL子查询中获取更多详细信息

Question

我有一个SQL查询向我提供数据库中的双记录列表。

select periodid, itemid from periodscore 
group by periodid, itemid 
having count(*) > 1 

这个按预期工作，但现在我想检索这些记录的其他字段（如日期最后更新等）。所以，我想：

select * from periodscore where periodscoreid in 
(select periodscoreid from periodscore 
group by periodid, itemid 
having count(*) > 1) 

当然，这并不工作，给我的错误：

Column 'periodscore.PeriodScoreID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

我怎样才能检索到在此查询的附加字段？

Answer 1

select ps.* 
from periodscore ps 
inner join (
    select periodid, itemid 
    from periodscore 
    group by periodid, itemid 
    having count(*) > 1 
) psm on ps.periodid = psm.periodid and ps.itemid = psm.itemid 

Answer 2

select p1.* from periodscore p1 JOIN 
    (select periodid, itemid from periodscore 
    group by periodid, itemid 
    having count(*) > 1) p2 
    ON (p1.periodId = p2.periodId 
     AND p1.itemid = p2.itemid) 

如果periodid或项目有快速的答案空值，那么

select p1.* from periodscore p1 JOIN 
    (select periodid, itemid from periodscore 
    group by periodid, itemid 
    having count(*) > 1) p2 
    ON (IFNULL(p1.periodId,0) = IFNULL(p2.periodId,0)) 
     AND IFNULL(p1.itemid,0) = IFNULL(p2.itemid,0))