Postgresql通过onequery循环创建另一个查询的结果

我使用的是Postgresql 9.6，并且想知道这是否可能。Postgresql通过onequery循环创建另一个查询的结果

我有一个类似的查询：

with mkt_types as (
    select distinct(mkt_medium) 
    from sessions 
), sessions_all as (
    select * 
    from sessions 
) 
select 
     count(visitor_id) as total_visits, 
      count(1) FILTER (where mkt_medium = 'seo') as seo_visitors, 
      count(1) FILTER (where mkt_medium = 'seo' and domain_sessionidx = 1) as seo_new_visitors, 
      count(1) FILTER (where mkt_medium = 'seo' and conversion_visit = 'true') as seo_converters, 
      count(1) FILTER (where mkt_medium = 'seo' and domain_sessionidx = 1 and conversion_visit = 'true') as seo_new_converters 
    from sessions_all;

是否有可能通过的结果，得到mkt_types和循环的价值观和更换查询的“搜索引擎优化”的一部分。

实例如果我有mkt_types“搜索引擎优化”，“电子邮件”，“旗帜”，那么我的最后的查询最终会得到结果，如果我输入了出来：

with mkt_types as (
    select distinct(mkt_medium) 
    from sessions 
), sessions_all as (
    select * 
    from sessions 
) 
select 
     count(visitor_id) as total_visits, 
      count(1) FILTER (where mkt_medium = 'seo') as seo_visitors, 
      count(1) FILTER (where mkt_medium = 'seo' and domain_sessionidx = 1) as seo_new_visitors, 
      count(1) FILTER (where mkt_medium = 'seo' and conversion_visit = 'true') as seo_converters, 
      count(1) FILTER (where mkt_medium = 'seo' and domain_sessionidx = 1 and conversion_visit = 'true') as seo_new_converters, 
      count(1) FILTER (where mkt_medium = 'email') as email_visitors, 
      count(1) FILTER (where mkt_medium = 'email' and domain_sessionidx = 1) as email_new_visitors, 
      count(1) FILTER (where mkt_medium = 'email' and conversion_visit = 'true') as email_converters, 
      count(1) FILTER (where mkt_medium = 'email' and domain_sessionidx = 1 and conversion_visit = 'true') as email_new_converters, 
      count(1) FILTER (where mkt_medium = 'banner') as banner_visitors, 
      count(1) FILTER (where mkt_medium = 'banner' and domain_sessionidx = 1) as banner_new_visitors, 
      count(1) FILTER (where mkt_medium = 'banner' and conversion_visit = 'true') as banner_converters, 
      count(1) FILTER (where mkt_medium = 'banner' and domain_sessionidx = 1 and conversion_visit = 'true') as banner_new_converters 
    from sessions_all;

谢谢

来源

2017-06-29 garage days development

无关，但：'distinct'是**不**的功能。编写'distinct（mkt_medium）'是没有意义的（另外：'session_all'cte是一个坏主意 - 它会减慢你的查询 - 只是把'sessions'表放在最后的查询中） –

在我看来，似乎我们不能那样做。当然你可以放入函数并建立查询。

如果你能得到的结果垂直而非水平，我可以建议其他查询是这样的：

(
select 'all' as mkt_medium, 
    count(1) as total_visits, 
    count(1) FILTER (where domain_sessionidx = 1) as new_visitors, 
    count(1) FILTER (where conversion_visit = 'true') as converters, 
    count(1) FILTER (where domain_sessionidx = 1 and conversion_visit = 'true') as new_converters 
    FROM sessions_all 
) UNION ALL (
SELECT mkt_medium, 
      count(1) as total_visits, 
    count(1) FILTER (where domain_sessionidx = 1) as new_visitors, 
    count(1) FILTER (where conversion_visit = 'true') as converters, 
    count(1) FILTER (where domain_sessionidx = 1 and conversion_visit = 'true') as new_converters 
    from sessions_all 
    GROUP BY mkt_medium 
)

来源

2017-06-29 06:24:15

这很好，比我想要做的和垂直工作比我最初的尝试要好得多。 –

Postgresql通过onequery循环创建另一个查询的结果

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