Sql Postgres-检索内部连接最早的记录

因此，在我的工作中，管理层希望评估我们需要多长时间才能联系到潜在客户。在1小时之前、1到3小时之间联系了多少潜在客户，依此类推

通过此查询，我可以接近结果，但如果所述潜在客户联系了多次（这是最常见的情况），则结果会出现偏差，例如： -Lead进入ad 9:00，在9:30获得联系，在1小时前为列计算一次，然后随后获得N次联系，因此事件将在所有不同的列中计算。 我想要的只是第一次接触

有没有办法让内部连接只解释最早的第一次接触，以及与我们相关的信息

ws_ts是lead时间戳，call_start是不言自明的。 leads表和call_日志根据contact_id连接

提前谢谢。我的选择：

    select 
    min(dcl.call_start::date) as Date, 
    sum(
        case
            when (((dcl.call_start) - (lsl.ws_ts))::interval) < '01:00:00'
            then 1
            else 0 
                end

    )as "Lead called before 1 hour",

    sum(
        case
            when ((  ((dcl.call_start) - (lsl.ws_ts)))::interval) > '01:00:00' and ((  ((dcl.call_start) - (lsl.ws_ts)))::interval)  < '03:00:00'
            then 1
            else 0 
                end

    )as "Lead called between 1 and 3 hours",


    sum(
        case
            when ((  ((dcl.call_start) - (lsl.ws_ts)))::interval) > '03:00:00' and ((  ((dcl.call_start) - (lsl.ws_ts)))::interval)  < '05:00:00'
            then 1
            else 0 
                end

    )as "Lead called between 3 and 5 hours",

    sum(
        case
            when ((  ((dcl.call_start) - (lsl.ws_ts)))::interval) > '05:00:00' 
            then 1
            else 0  
                end

    )as "Lead called after 5 hours"


    from public.leads lsl 
    inner join dialer.dialer_call_logs dcl on (lsl.ws_contact_id::int = dcl.contact_id )
    where lsl.ws_source = 'CAMPAIGN'  and lsl.ws_ts::date between '2020-03-09' and '2020-03-13' and lsl.ws_type <> 'call' and dcl."source" = 'CAMPAIGN'
    group by lsl.ws_creation

---

一种方法是横向连接：

from public.leads lsl cross join lateral
     (select dcl.*
      from dialer.dialer_call_logs dcl 
      where ws_contact_id::int = contact_id
      order by dcl.call_start asc
      limit 1
     ) dcl
where ws_source = 'CAMPAIGN' and
      ws_ts::date between '2020-03-09' and '2020-03-13' and
      ws_type <> 'call' and dcl."source" = 'CAMPAIGN'

---

您尚未指定列的来源。有些where条件可能需要在子查询中。

没错，已经指定了列的原点。我们将尝试实施您的解决方案，并回复您。

from public.leads lsl cross join lateral
     (select dcl.*
      from dialer.dialer_call_logs dcl 
      where ws_contact_id::int = contact_id
      order by dcl.call_start asc
      limit 1
     ) dcl
where ws_source = 'CAMPAIGN' and
      ws_ts::date between '2020-03-09' and '2020-03-13' and
      ws_type <> 'call' and dcl."source" = 'CAMPAIGN'