oracle，查詢加入問題「SQL命令沒有正確結束」

Question

我想在oracle中加入2個SQL查詢，但我真的不熟悉它，我的結構似乎對我來說是正確的，但是我有這個SQL錯誤信息： 「[錯誤] ORA-00933：SQL命令不能正確地結束」

所以我有兩個疑問： 第一個是：

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

，第二個是：

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 

我想做我的加入在CAMPAIGN_ID所以我做：

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 

任何想法，爲什麼我得到這個消息：

[ERR] ORA-00933：SQL命令不能正確地結束

Answer 1

你已經把inner join在應該在where條款之前

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

你的內連接應放在你的where子句之前。