Question

我有一个正在与Amazon redshift一起使用的SQL，尽管两个查询在没有联合的情况下都是有效的，但第二个select语句仍然出错：

select p.date,
       sum(p.pageviews) as "total_pageviews",
       sum(p.sessions)  as "total_sessions",
       l.location_id,
       p.brand_key
from public.local_site_sessions p, public.location_map l
where l.affiliate_id = p.affiliate_id
group by p.date, p.brand_key, l.location_id order by p.date

union

select g.date,
       g.sessions as "total_pageviews",
       g.pages_per_session as "total_sessions",
       g.location_id,
       brand_key
from public.ga_lead g
group by g.date, g.brand_key, g.location_id, g.sessions, g.pages_per_session    
order by g.date

该错误表明第二个select语句是语法错误？如何更正此查询？

Answer 1

第二个查询不需要分组依据。.您尚未聚合函数

select p.date, sum(p.pageviews) as "total_pageviews", sum(p.sessions) as "total_sessions",l.location_id, p.brand_key
FROM public.local_site_sessions p
INNER JOIN  public.location_map l ON  l.affiliate_id = p.affiliate_id
group by p.date, p.brand_key, l.location_id 

union

select g.date, g.sessions , g.pages_per_session ,g.location_id, brand_key
FROM public.ga_lead g
order by 1,4,5

并且您不应该基于在哪里使用显式联接而使用较旧的隐式联接如果您需要按顺序订购，请在最后一个选择中应用订购者，并且不应该对第二个选择使用别名

factory :group_feature_config do
  transient do
    group
  end
  association :group_feature, factory: :group_feature, group: group
  association :group_user, factory: :group_user, group: group
end

Answer 2

只需在您的初始联合查询中添加外部选择

    Select * from
     ( Select.... union Select.... )

将UNION与聚合一起使用时的SQL语句错误

2 个答案: