column 必须在 group-by 中或应该聚合使用 function

Question

我试图运行一个连接 3 个表并按 2 列分组的查询。 下面是以下代码：-

select
    i.spektr_date,
    i.campaign_id,
    c.advertiser_id,
    i.total_clicks,
    i.ad_program_type,
    i.traffic_attributes,
    c.cpc,
    i.total_clicks/i.total_impressions as CTR,
    (
        (co.sale_price * co.sale_quantity) / (c.cpc * i.total_clicks)
    ) as ROAS,
    (
        (c.cpc * i.total_clicks) / (co.sale_price * co.sale_quantity)
    ) as ACOS
from
    spektr_ach.d_sp_ad_impressions i
    left join spektr_ach.d_sp_ad_clicks c on i.advertiser_id = c.advertiser_id
    and i.campaign_id = c.campaign_id
    left join spektr_ach.d_sp_ad_conversions co on i.advertiser_id = co.advertiser_id
    and i.campaign_id = co.campaign_id
    where c.advertiser_id = 40420525505 and i.traffic_attributes = 1
    and i.ad_program_type = 'SPONSORED_PRODUCTS'
    and i.total_clicks > 0
    group by(i.spektr_date,
    i.campaign_id)
    having i.spektr_date = date'2022-09-18'
    order by(i.spektr_date,
    i.campaign_id)
;

但是在运行查询时我收到以下错误SYNTAX_ERROR: line 4:5: 'c.advertiser_id' must be an aggregate expression or appear in GROUP BY clause

如果我包含 advertiser_id，我的查询目的就会改变。 有人可以帮我解决这个问题吗？

谢谢

Answer 1

postgresql 中的按函数分组需要解释为只会对使用聚合函数的查询进行分组，因为没有重复值应该使用 DISTINCT，当您认为服务器不可能随机选择一个值时，这种方式是正确的一个组是组中未声明的列，这适用于 mysql 但 postgresql 不希望进行这种随机选择，导致用户尝试使用 ORDER BY 和其他人来匹配正确的随机值。

select distinct (i.spektr_date,
    i.campaign_id) , 
    i.spektr_date,
    i.campaign_id,
    c.advertiser_id,
    i.total_clicks,
    i.ad_program_type,
    i.traffic_attributes,
    c.cpc,
    i.total_clicks/i.total_impressions as CTR,
    (
        (co.sale_price * co.sale_quantity) / (c.cpc * i.total_clicks)
    ) as ROAS,
    (
        (c.cpc * i.total_clicks) / (co.sale_price * co.sale_quantity)
    ) as ACOS
from
    spektr_ach.d_sp_ad_impressions i
    left join spektr_ach.d_sp_ad_clicks c on i.advertiser_id = c.advertiser_id
    and i.campaign_id = c.campaign_id
    left join spektr_ach.d_sp_ad_conversions co on i.advertiser_id = co.advertiser_id
    and i.campaign_id = co.campaign_id
    where c.advertiser_id = 40420525505 and i.traffic_attributes = 1
    and i.ad_program_type = 'SPONSORED_PRODUCTS'
    and i.total_clicks > 0
    AND i.spektr_date = date'2022-09-18'
    order by i.spektr_date,
    i.campaign_id
;