Question

我想获取事件ID为event_id ='NGO102' or event_id ='NGO103' or event_id ='NGO109' or event_id ='NGO111'的数据

这是我的查询

select  event_id, orgname,event_date,num_of_event_pa,start_date
FROM event_details a  
INNER JOIN registration b on a.orgname =b.org_name  
where event_date >= '2017-03-31 00:00:00' AND event_date <= '2018-04-01 00:00:00' or event_id ='NGO102' or event_id ='NGO103' or event_id ='NGO109' or event_id ='NGO111'
 group by a.event_id, a.orgname,a.published_date, b.num_of_event_pa, b.start_date
     order by event_id DESC

但是显示所有记录我需要具有event_id的记录是 event_id ='NGO102' or event_id ='NGO103' or event_id ='NGO109' or event_id ='NGO111'。我在哪里做错了，请指导我谢谢

Answer 1

您可能希望在括号内的每个AND上有一个OR条件。

..
 AND event_date <= '2018-04-01 00:00:00' AND 
(  event_id = 'NGO102' OR event_id = 'NGO103' OR event_id = 'NGO109'
OR event_id = 'NGO111'
)..

您可以使用IN

对其进行简化

..  AND event_date <= '2018-04-01 00:00:00' 
    AND event_id IN ( 'NGO102','NGO103','NGO109','NGO111') ..

Answer 2

您为什么要使用group by？我怀疑您的查询可能有问题。

Kaushik指出，您想要in。您还应该使用含义表别名并限定所有列名称：

select ed.event_id, ed.orgname, ed.event_date,
       ?.num_of_event_pa, ?.start_date
from event_details ed join  
     registration r
     on ed.orgname = r.org_name  
where ed.event_date >= '2017-03-31' and
      ed.event_date < '2018-04-01'
      ed.event_id in ('NGO102', 'NGO103', 'NGO109', 'NGO111')
order by event_id desc;

请注意，饮食上不需要时间部分。 JOIN条件也是可疑的。我希望JOIN位于event_id之类的地方。

或postgres中的难题

2 个答案: