oracle，查询加入问题“SQL命令未正确结束”

Question

我想在oracle中加入2个SQL查询，但我真的不熟悉它，我的结构对我来说似乎是对的，但是我有这个SQL错误信息：＆＃34; [Err] ORA- 00933：SQL命令未正确结束＆＃34;

所以我有两个问题： 第一个是：

select 
    campaign_id, count(*) as "number of emails sent"
from 
    dg_res_sent
where 
    dg_end_date > sysdate
group by campaign_id

，第二个是：

select 
    offer_name, 
    campaign_id, 
    offer_category as "link category", 
    count(*) as "number of clicks"
from 
    dg_res_click
where
    dg_end_date > sysdate
and
    SUBSTR(offer_name,1,3) = 'SKU'
group by 
    offer_name, 
    campaign_id, 
    offer_category

我想加入campaign_id，所以我做了：

select 
    offer_name, 
    campaign_id, 
    offer_category as "link category", 
    count(*) as "number of clicks",
    sent.nb_sent
from 
    dg_res_click
where
    dg_end_date > sysdate
and
    SUBSTR(offer_name,1,3) = 'SKU'
inner join
    (select 
        campaign_id, count(*) as "nb_sent"
    from 
        dg_res_sent
    where 
        dg_end_date > sysdate
    group by campaign_id) sent
on 
    sent.campaign_id = dg_res_click.campaign_id
group by 
    offer_name, 
    campaign_id, 
    offer_category

我知道为什么会收到这条消息：

  

[Err] ORA-00933：SQL命令未正确结束

Answer 1

您已将inner join放在错误的位置。它应该在where子句之前

select 
    dg_res_click.offer_name, 
    dg_res_click.campaign_id, 
    dg_res_click.offer_category as "link category", 
    count(*) as "number of clicks",
    sent.nb_sent
from 
    dg_res_click 
inner join
    (select 
        campaign_id, count(*) as nb_sent
    from 
        dg_res_sent
    where 
        dg_end_date > sysdate
    group by campaign_id) sent
on 
    sent.campaign_id = dg_res_click.campaign_id

where
    dg_res_click .dg_end_date > sysdate
and
    SUBSTR(dg_res_click.offer_name,1,3) = 'SKU'
group by 
    dg_res_click.offer_name, 
    dg_res_click.campaign_id, 
    dg_res_click.offer_category,
    sent.nb_sent

Answer 2

您的内部联接应放在where子句之前。