sql子查询出错答案

【问题标题】：sub query in sql errorsql子查询出错
【发布时间】：2017-01-17 10:37:28
【问题描述】：

我想应用子查询我这样做但是这显示一个错误

select          t.Tid, 
            i.Description,          
            tst.Description,
            dd.DoID,
            dd.Document,
            dd.docname  
                
    from    Ticet t 
        (
            select tid, MIN(hid) hid from TtH th group by Tid
        ) mh
    inner join DocDown dd on t.clientid=dd.Clientid
    inner join Item i on t.Itemid=i.Itemid
    inner join TStat tst on t.Status=tst.Status
    where 
     t.Status in (1, 2 )
    and gu.Userid=1926
    
    order by t.Tid

错误

关键字“select”附近的语法不正确。

')' 附近的语法不正确。

【问题讨论】：

标签： sql-server subquery

【解决方案1】：

请为 mh 添加子查询：

select t.Tid, i.Description, tst.Description, dd.DoID, dd.Document, dd.docname  
from   Ticet t 
inner join ( select tid, MIN(hid) hid from TtH th group by Tid ) as  mh on t.Tid=mh.tid
inner join DocDown dd on t.clientid=dd.Clientid
inner join Item i on t.Itemid=i.Itemid
inner join TStat tst on t.Status=tst.Status
where t.Status in (1, 2 ) and gu.Userid=1926
order by t.Tid

【讨论】：

【解决方案2】：

试试下面的查询，你错过了join 和t 和mh 的条件

select  t.Tid, 
        i.Description,          
        tst.Description,
        dd.DoID,
        dd.Document,
        dd.docname  

from    Ticet t 
    inner join    (
            select tid, MIN(hid) hid from TtH th group by Tid
        ) mh    on mh.tid = t.Tid
    inner join DocDown dd on t.clientid=dd.Clientid
    inner join Item i on t.Itemid=i.Itemid
    inner join TStat tst on t.Status=tst.Status
where t.Status in (1, 2 )
    and gu.Userid=1926
order by t.Tid

【讨论】：

【解决方案3】：

这个

from    Ticet t 
(
select tid, MIN(hid) hid from TtH th group by Tid
) mh

应该是

   from    Ticet t 
    JOIN
        (
            select tid, MIN(hid) hid from TtH th group by Tid
        ) mh
on mh.somecol =t.somecol
and so on

【讨论】：

【解决方案4】：

你需要加入你的子查询表...

假设 mh.tid = t.tid 是您想要的连接。

SELECT t.Tid, i.Description, tst.Description, dd.DoID, dd.Document, dd.docname  
FROM Ticet t 
INNER JOIN (SELECT tid, MIN(hid) hid FROM TtH th GROUP BY Tid) mh ON mh.tid = t.Tid
INNER JOIN DocDown dd ON t.clientid = dd.Clientid
INNER JOIN Item i ON t.Itemid = i.Itemid
INNER JOIN TStat tst ON t.Status = tst.Status
WHERE t.Status IN (1, 2)
AND gu.Userid = 1926
ORDER BY t.Tid

【讨论】：