内部交叉连接横向时的情况？

Question

我有以下 SQL 声明：

WITH report AS (
         SELECT reattr.app_id,
            reattr.campaign_c AS campaign,
            reattr.media_source_pid AS media_source,
            reattr.date,
            reattr.agency_pmd_af_prt AS agency,
            sum(reattr.total_cost) AS total_cost,
            sum(reattr.total_revenue) AS total_revenue,
            sum(reattr.af_purchase_unique_users) AS af_purchase_unique_users,
            sum(reattr.af_purchase_event_counter) AS af_purchase_event_counter,
            reattr.conversion_type
           FROM a.partners_reattr reattr
          GROUP BY reattr.app_id, reattr.campaign_c, reattr.media_source_pid, reattr.date, reattr.agency_pmd_af_prt, reattr.conversion_type 
        )
SELECT report.app_id,
    report.campaign,
    report.media_source,
    report.agency,
    report.date,
     case
       when report.conversion_type = 're-engagement'::text then 're-engagement'::text
       ELSE 'retargeting'::text
       END AS metric_type,
    v.metric_key,
    v.metric_value,
    v.metric_name
   FROM report
     CROSS JOIN LATERAL ( VALUES 
     ('installs'::text, report.conversions,'installs'::text), 
     ('total_cost'::text,report.total_cost,'total_cost'::text), 
     ('event'::text,report.af_purchase_unique_users,'af_purchase_unique_users'::text), 
     ('event'::text,report.af_purchase_event_counter,'af_purchase_event_counter'::text), 
     ('total_revenue'::text,report.total_revenue,'total_revenue'::text)) 
     v(metric_key, metric_value, metric_name)
  WHERE v.metric_value IS NOT NULL;

我想要的.. 如果 conversion_type = re-engagement 那么 CROSS JOIN LATERAL 中的第一行应该是 ('conversions'::text, report.conversions,'conversions'::text),.

如果conversion_type = re-atribution 那么它应该是 ('installs'::text, report.conversions,'installs'::text)。所以我需要像 CASE - WHEN 这样的东西，但据我所知，我不能在交叉连接横向值中使用它？我无法应用它。所以我需要在 CROSS JOIN LATERAL 的第一行中动态设置 metric_key。可能吗？

Answer 1

您的 VALUES 列表中的第一个条目可能只是

VALUES (CASE WHEN conversion_type = 're-engagement'
             THEN 'conversions'::text
             ELSE 'installs'::text
        END,
        report.conversions,
        CASE WHEN conversion_type = 're-engagement'
             THEN 'conversions'::text
             ELSE 'installs'::text
        END), ...

内部交叉连接横向时的情况？

Case when inside cross join lateral?

sql

postgresql

lateral-join