如何将两个单独的 sql 查询组合成两个单独的列？

Question

我正在处理元数据库中的 SQL 数据库查询。我有两个单独的查询，我希望将它们输出为两个单独的列，按名称排序。执行联合后，它似乎将所有值放入一列中，重复名称。实现两列输出（每个查询一个）的最佳方法是什么？

SELECT "source"."name" AS "name", "source"."count" AS "count"

FROM (SELECT "source"."count" AS "count", "source"."name" AS "name", "source"."count" AS "count_2", ("source"."count" * 1.5) AS "a" FROM (SELECT "marketing_campaign__via__campa"."name" AS "name", count(*) AS "count" FROM "public"."event_event"
LEFT JOIN "public"."event_event" "Event Event - Source Event" ON "public"."event_event"."source_event_id" = "Event Event - Source Event"."id" LEFT JOIN "public"."marketing_campaign" "marketing_campaign__via__campa" ON "public"."event_event"."campaign_id" = "marketing_campaign__via__campa"."id"
WHERE "public"."event_event"."status" = 'Queued'
GROUP BY "marketing_campaign__via__campa"."name"
ORDER BY "marketing_campaign__via__campa"."name" ASC) "source") "source"

union all


SELECT marketing_campaign.name,

    cast(sum((event_event.status='Opt-in')::int) as decimal) / nullif(sum((event_event.status='Sent')::int), 0)* 100 as "Opt-in Rate (Sent)"
FROM event_event
JOIN marketing_campaign ON event_event.campaign_id = marketing_campaign.id
WHERE marketing_campaign.is_archived=false [[AND {{date_created}}]]
GROUP BY marketing_campaign.name

LIMIT 1048576

Answer 1

而不是 union all 您需要在 name 列上加入两个表，然后从两个表中分别选择第二列。我正在考虑名称列与两个表相同的事实。如果一个表中存在任何名称而另一个表中不存在，则不会显示在结果中

select t1.name,t1.count ,t2."Opt-in Rate (Sent)" ,t1.count*t2."Opt-in Rate (Sent)" as predicted
from (
SELECT "source"."name" AS "name", "source"."count" AS "count"

FROM (SELECT "source"."count" AS "count", "source"."name" AS "name", "source"."count" AS "count_2", ("source"."count" * 1.5) AS "a" FROM (SELECT "marketing_campaign__via__campa"."name" AS "name", count(*) AS "count" FROM "public"."event_event"
LEFT JOIN "public"."event_event" "Event Event - Source Event" ON "public"."event_event"."source_event_id" = "Event Event - Source Event"."id" LEFT JOIN "public"."marketing_campaign" "marketing_campaign__via__campa" ON "public"."event_event"."campaign_id" = "marketing_campaign__via__campa"."id"
WHERE "public"."event_event"."status" = 'Queued'
GROUP BY "marketing_campaign__via__campa"."name"
ORDER BY "marketing_campaign__via__campa"."name" ASC) "source") "source") t1 inner join
(
SELECT marketing_campaign.name,

    cast(sum((event_event.status='Opt-in')::int) as decimal) / nullif(sum((event_event.status='Sent')::int), 0)* 100 as "Opt-in Rate (Sent)"
FROM event_event
JOIN marketing_campaign ON event_event.campaign_id = marketing_campaign.id
WHERE marketing_campaign.is_archived=false [[AND {{date_created}}]]
GROUP BY marketing_campaign.name
)t2 on t1.name=t2.name
LIMIT 1048576